Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

On Jun 1, 1:45 am, "Adam" wrote:
If you use a random wire in the Sony 7600GR radio and accidently short it,
can it destory the radio and/or cause damage or is it protected?

In the manual it says it has DC power but on at least two websites, it
supposely only has a "sense power" to turn antennas off and on.

I called sony customer support and they claim the jack doesn't have any DC
power in it, that it is only reception. This was said by two different
agents, but when I emailed them, they keep talking about the headphone jack
for some reason.

Will someone please settle this for me, it's like some are saying it can
short and at the same time, some are saying it can't at all. I just want to
have this darn thing settled.

Thanks in advanced.

I guess this touches to the issue of Sony putting a DC voltage to the
antenna jacks to power the AN-LP series of antennas.

The antenna jack on the ICF-SW07 does incorporate a DC voltage to
power the supplied AN-LP2 antenna. The instruction manual accordingly
warns:

"Do not connect any other antennas other than the recommended active
antennas to the AM EXT ANT jack of the unit, as the jack supplies DC
voltage to power the recommended active antennas."

Neither the instruction manual to the ICF-SW7600G nor that for the ICF-
SW7600GR has any similar such disclaimer.

In hooking up the AN-LP1 antenna to the ICF-SW7600GR, I have found
that the radio does not power the antenna. The antenna requires its
own batteries (unlike the AN-LP2 which can be powered directly by the
'SW07).

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

junius ) writes:
On Jun 1, 1:45 am, "Adam" wrote:
If you use a random wire in the Sony 7600GR radio and accidently short it,
can it destory the radio and/or cause damage or is it protected?

In the manual it says it has DC power but on at least two websites, it
supposely only has a "sense power" to turn antennas off and on.

I called sony customer support and they claim the jack doesn't have any DC
power in it, that it is only reception. This was said by two different
agents, but when I emailed them, they keep talking about the headphone jack
for some reason.

Will someone please settle this for me, it's like some are saying it can
short and at the same time, some are saying it can't at all. I just want to
have this darn thing settled.

Thanks in advanced.

I guess this touches to the issue of Sony putting a DC voltage to the
antenna jacks to power the AN-LP series of antennas.

The antenna jack on the ICF-SW07 does incorporate a DC voltage to
power the supplied AN-LP2 antenna. The instruction manual accordingly
warns:

"Do not connect any other antennas other than the recommended active
antennas to the AM EXT ANT jack of the unit, as the jack supplies DC
voltage to power the recommended active antennas."

An obvious solution, though perhaps too late for the original poster,
would be to put a ceramic capacitor in series between the connector
and the wire, just in case. Something like .001uF or maybe .01uF. It
won't hurt.

Michael

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

On Jun 1, 9:58 am, junius wrote:
On Jun 1, 1:45 am, "Adam" wrote:





If you use a random wire in the Sony 7600GR radio and accidently short it,
can it destory the radio and/or cause damage or is it protected?

In the manual it says it has DC power but on at least two websites, it
supposely only has a "sense power" to turn antennas off and on.

I called sony customer support and they claim the jack doesn't have any DC
power in it, that it is only reception. This was said by two different
agents, but when I emailed them, they keep talking about the headphone jack
for some reason.

Will someone please settle this for me, it's like some are saying it can
short and at the same time, some are saying it can't at all. I just want to
have this darn thing settled.

Thanks in advanced.

I guess this touches to the issue of Sony putting a DC voltage to the
antenna jacks to power the AN-LP series of antennas.

The antenna jack on the ICF-SW07 does incorporate a DC voltage to
power the supplied AN-LP2 antenna. The instruction manual accordingly
warns:

"Do not connect any other antennas other than the recommended active
antennas to the AM EXT ANT jack of the unit, as the jack supplies DC
voltage to power the recommended active antennas."

Neither the instruction manual to the ICF-SW7600G nor that for the ICF-
SW7600GR has any similar such disclaimer.

In hooking up the AN-LP1 antenna to the ICF-SW7600GR, I have found
that the radio does not power the antenna. The antenna requires its
own batteries (unlike the AN-LP2 which can be powered directly by the
'SW07).- Hide quoted text -

- Show quoted text -

Heckfire, I should post messages while at work... A mistake here...
The manual for the SW7600GR does have one of these disclaimers, now
doesn't it? Worded as such: "Do not connect external antennas other
than those recommended to the AM EXT ANT jack. This jack outputs DC
voltage for antenna power supply."

Interestingly, the '7600G manual, dated 1994, has no such warning, and
in fact has instructions for the use of the '7600G with the old AN-1
amplified antenna, among others.

In any case, both radios behave in entirely the same manner when in
use with the AN-LP1.

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

On Jun 1, 9:58 am, junius wrote:
On Jun 1, 1:45 am, "Adam" wrote:





If you use a random wire in the Sony 7600GR radio and accidently short it,
can it destory the radio and/or cause damage or is it protected?

In the manual it says it has DC power but on at least two websites, it
supposely only has a "sense power" to turn antennas off and on.

I called sony customer support and they claim the jack doesn't have any DC
power in it, that it is only reception. This was said by two different
agents, but when I emailed them, they keep talking about the headphone jack
for some reason.

Will someone please settle this for me, it's like some are saying it can
short and at the same time, some are saying it can't at all. I just want to
have this darn thing settled.

Thanks in advanced.

I guess this touches to the issue of Sony putting a DC voltage to the
antenna jacks to power the AN-LP series of antennas.

The antenna jack on the ICF-SW07 does incorporate a DC voltage to
power the supplied AN-LP2 antenna. The instruction manual accordingly
warns:

"Do not connect any other antennas other than the recommended active
antennas to the AM EXT ANT jack of the unit, as the jack supplies DC
voltage to power the recommended active antennas."

Neither the instruction manual to the ICF-SW7600G nor that for the ICF-
SW7600GR has any similar such disclaimer.

In hooking up the AN-LP1 antenna to the ICF-SW7600GR, I have found
that the radio does not power the antenna. The antenna requires its
own batteries (unlike the AN-LP2 which can be powered directly by the
'SW07).- Hide quoted text -

- Show quoted text -

To Adam, Mr. Alessandrini and Mike:

Perhaps you might find the following interesting:

From http://groups.google.com/group/rec.r...3?dmode=source

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA
DC current to the external antenna circuit. The coil is to prevent
"polluting" the power circuit of the radio with radio frequency
signal.
Evidently, the purpose of this arrangement is to "inform" the
accessory
antenna when the radio is turned on. In case of the Sony AN-LP1 it
turns on the antenna without need to use the antenna power switch.
However, the 7600G will NOT power the antenna, the 10 mA are not
enough
to power the amplifier circuit. The power for the AN-LP1 comes from
its
own batteries. You can use this feature with any active antenna by
including a proper power-up circuit - a nice feature if your active
antenna is located far away from the radio and you want it to turn on
and off automatically when you use your radio.

2.- You can connect any other antenna (provided it is correctly
designed
and installed) to the EXT ANT socket without risking to damage the
radio. However, if the external antenna circuit has low DC
resistence,
it will drain some current from the radio. Therefore, you will
experiment slightly higher power consumption from your batteries (up
to
10% at normal listening volume). You can avoid this current drain by
including a small ceramic capacitor (1000 pF) in series with the
antenna
circuit, however I don't think it is really necessary.

3.- The 7600G has some basic protection build into the EXT ANT input
circuit. Any static buid-up will be drained off via the power circuit
mentioned in point 1. It also includes a diode pair (1SS123) to
protect
the input RF amplifier FET from damage due to too strong signals or an
accidental connection of the antenna to a low voltage AC source. IT
IS
NOT A SUBSTITUTE FOR A PROPER ANTENNA GROUNDING AND LIGHTNING
PROTECTION
IF YOU USE AN EXTERNAL ANTENNA - YOU STILL NEED TO PROPERLY GROUND
YOUR
EXTERNAL ANTENNA AND PROTECT YOUR RADIO, but it builds some margin of
safety to protect the front-end FET - a common problem with the Sony
2001D (2010).

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

On Jun 1, 10:19 am, (Michael Black) wrote:
junius ) writes:
On Jun 1, 1:45 am, "Adam" wrote:
If you use a random wire in the Sony 7600GR radio and accidently short it,
can it destory the radio and/or cause damage or is it protected?

In the manual it says it has DC power but on at least two websites, it
supposely only has a "sense power" to turn antennas off and on.

I called sony customer support and they claim the jack doesn't have any DC
power in it, that it is only reception. This was said by two different
agents, but when I emailed them, they keep talking about the headphone jack
for some reason.

Will someone please settle this for me, it's like some are saying it can
short and at the same time, some are saying it can't at all. I just want to
have this darn thing settled.

Thanks in advanced.

I guess this touches to the issue of Sony putting a DC voltage to the
antenna jacks to power the AN-LP series of antennas.

The antenna jack on the ICF-SW07 does incorporate a DC voltage to
power the supplied AN-LP2 antenna. The instruction manual accordingly
warns:

"Do not connect any other antennas other than the recommended active
antennas to the AM EXT ANT jack of the unit, as the jack supplies DC
voltage to power the recommended active antennas."

An obvious solution, though perhaps too late for the original poster,
would be to put a ceramic capacitor in series between the connector
and the wire, just in case. Something like .001uF or maybe .01uF. It
won't hurt.

Michael- Hide quoted text -

- Show quoted text -

I have read of some folks opting for this solution. Are there inline
capacitors available with mini-jacks (male on one end, female on the
other)? If not (and forgive if this is a dumb question), what does
one need to go about constructing this?

Thanks,

Junius

Sony 7600GR External Antenna Jack, Needs to be settled, Can it beshorted out to the point that it destroys the radio.
 

junius wrote:

I have read of some folks opting for this solution. Are there inline
capacitors available with mini-jacks (male on one end, female on the
other)? If not (and forgive if this is a dumb question), what does
one need to go about constructing this?

Thanks,

Junius


Buy a stereo headphone plug that fits, and connect the antenna wire
to the tip, only.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

In article . com,
junius wrote:

On Jun 1, 9:58 am, junius wrote:
On Jun 1, 1:45 am, "Adam" wrote:





If you use a random wire in the Sony 7600GR radio and accidently
short it, can it destory the radio and/or cause damage or is it
protected?

In the manual it says it has DC power but on at least two
websites, it supposely only has a "sense power" to turn antennas
off and on.

I called sony customer support and they claim the jack doesn't
have any DC power in it, that it is only reception. This was said
by two different agents, but when I emailed them, they keep
talking about the headphone jack for some reason.

Will someone please settle this for me, it's like some are saying
it can short and at the same time, some are saying it can't at
all. I just want to have this darn thing settled.

Thanks in advanced.

I guess this touches to the issue of Sony putting a DC voltage to
the antenna jacks to power the AN-LP series of antennas.

The antenna jack on the ICF-SW07 does incorporate a DC voltage to
power the supplied AN-LP2 antenna. The instruction manual
accordingly warns:

"Do not connect any other antennas other than the recommended
active antennas to the AM EXT ANT jack of the unit, as the jack
supplies DC voltage to power the recommended active antennas."

Neither the instruction manual to the ICF-SW7600G nor that for the
ICF- SW7600GR has any similar such disclaimer.

In hooking up the AN-LP1 antenna to the ICF-SW7600GR, I have found
that the radio does not power the antenna. The antenna requires its
own batteries (unlike the AN-LP2 which can be powered directly by
the 'SW07).- Hide quoted text -

- Show quoted text -

To Adam, Mr. Alessandrini and Mike:

Perhaps you might find the following interesting:

From
http://groups.google.com/group/rec.r...dfd16b3dca3750
b3?dmode =source

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA DC current to the external antenna circuit. The coil is to
prevent "polluting" the power circuit of the radio with radio
frequency signal. Evidently, the purpose of this arrangement is to
"inform" the accessory antenna when the radio is turned on. In case
of the Sony AN-LP1 it turns on the antenna without need to use the
antenna power switch. However, the 7600G will NOT power the antenna,
the 10 mA are not enough to power the amplifier circuit. The power
for the AN-LP1 comes from its own batteries. You can use this
feature with any active antenna by including a proper power-up
circuit - a nice feature if your active antenna is located far away
from the radio and you want it to turn on and off automatically when
you use your radio.

This does not sound right to me. A power detect circuit would only need
micro-amps not 10 ma. 10 ma is respectable power for a simple amplifier.

--
Telamon
Ventura, California

Sony 7600GR External Antenna Jack (EAJ) , Needs to be settled - Question : Can it (EAJ) be Shorted-Out to the point that it Destroys the Radio. Answer : No !
 

On Jun 2, 6:25 am, junius wrote:
On Jun 1, 9:58 am, junius wrote:





On Jun 1, 1:45 am, "Adam" wrote:

If you use a random wire in the Sony 7600GR radio and accidently short it,
can it destory the radio and/or cause damage or is it protected?

In the manual it says it has DC power but on at least two websites, it
supposely only has a "sense power" to turn antennas off and on.

I called sony customer support and they claim the jack doesn't have any DC
power in it, that it is only reception. This was said by two different
agents, but when I emailed them, they keep talking about the headphone jack
for some reason.

Will someone please settle this for me, it's like some are saying it can
short and at the same time, some are saying it can't at all. I just want to
have this darn thing settled.

Thanks in advanced.

I guess this touches to the issue of Sony putting a DC voltage to the
antenna jacks to power the AN-LP series of antennas.

The antenna jack on the ICF-SW07 does incorporate a DC voltage to
power the supplied AN-LP2 antenna. The instruction manual accordingly
warns:

"Do not connect any other antennas other than the recommended active
antennas to the AM EXT ANT jack of the unit, as the jack supplies DC
voltage to power the recommended active antennas."

Neither the instruction manual to the ICF-SW7600G nor that for the ICF-
SW7600GR has any similar such disclaimer.

In hooking up the AN-LP1 antenna to the ICF-SW7600GR, I have found
that the radio does not power the antenna. The antenna requires its
own batteries (unlike the AN-LP2 which can be powered directly by the
'SW07).- Hide quoted text -

- Show quoted text -

To Adam, Mr. Alessandrini and Mike:

Perhaps you might find the following interesting:

Fromhttp://groups.google.com/group/rec.radio.shortwave/msg/dfd16b3dca3750...

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA
DC current to the external antenna circuit. The coil is to prevent
"polluting" the power circuit of the radio with radio frequency
signal.
Evidently, the purpose of this arrangement is to "inform" the
accessory
antenna when the radio is turned on. In case of the Sony AN-LP1 it
turns on the antenna without need to use the antenna power switch.
However, the 7600G will NOT power the antenna, the 10 mA are not
enough
to power the amplifier circuit. The power for the AN-LP1 comes from
its
own batteries. You can use this feature with any active antenna by
including a proper power-up circuit - a nice feature if your active
antenna is located far away from the radio and you want it to turn on
and off automatically when you use your radio.

2.- You can connect any other antenna (provided it is correctly
designed
and installed) to the EXT ANT socket without risking to damage the
radio. However, if the external antenna circuit has low DC
resistence,
it will drain some current from the radio. Therefore, you will
experiment slightly higher power consumption from your batteries (up
to
10% at normal listening volume). You can avoid this current drain by
including a small ceramic capacitor (1000 pF) in series with the
antenna
circuit, however I don't think it is really necessary.

3.- The 7600G has some basic protection build into the EXT ANT input
circuit. Any static buid-up will be drained off via the power circuit
mentioned in point 1. It also includes a diode pair (1SS123) to
protect
the input RF amplifier FET from damage due to too strong signals or an
accidental connection of the antenna to a low voltage AC source. IT
IS
NOT A SUBSTITUTE FOR A PROPER ANTENNA GROUNDING AND LIGHTNING
PROTECTION
IF YOU USE AN EXTERNAL ANTENNA - YOU STILL NEED TO PROPERLY GROUND
YOUR
EXTERNAL ANTENNA AND PROTECT YOUR RADIO, but it builds some margin of
safety to protect the front-end FET - a common problem with the Sony
2001D (2010).- Hide quoted text -

- Show quoted text -

OK So . . .
The 470 Ohm Resister plus 100 uH Coil would be a
Series Circuit {In-Series} to anything pluged into the
External Antenna Jack of the Sony ICF-SW7600GR.

So and Antenna Wire and Ground Wire connected to
the Jack would NOT Short-Out the Radio's Power [.]

However - A "Jumper" Wire {Direct Short} across the Jack
would 'cause' the Radio to go Silent {Eliminating any
RF Signals} and 'appear' to be Shorted-Out {No Sound}
until the Jumper Wire was removed.

WRT - Sony 7600GR External Antenna Jack,
Needs to be settled,

QUESTION : Can it be shorted out to the point
that it destroys the radio.

ANSWER : No !

our eyes and ears can lead us to 'assume' facts : that
are not in evidence and in-fact are not facts at all ~ RHF

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

On Jun 2, 8:40 pm, craigm wrote:
From
http://groups.google.com/group/rec.r...dfd16b3dca3750
b3?dmode =source

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA DC current to the external antenna circuit. The coil is to
prevent "polluting" the power circuit of the radio with radio
frequency signal. Evidently, the purpose of this arrangement is to
"inform" the accessory antenna when the radio is turned on. In case
of the Sony AN-LP1 it turns on the antenna without need to use the
antenna power switch. However, the 7600G will NOT power the antenna,
the 10 mA are not enough to power the amplifier circuit. The power
for the AN-LP1 comes from its own batteries. You can use this
feature with any active antenna by including a proper power-up
circuit - a nice feature if your active antenna is located far away
from the radio and you want it to turn on and off automatically when
you use your radio.

This does not sound right to me. A power detect circuit would only need
micro-amps not 10 ma. 10 ma is respectable power for a simple amplifier.

According to the schematic for the antenna, only 6.4 mA is drawn from the
batteries ( 3 volts) when turned on.

The sense circuit to turn on the antenna from a radio has a 100 kohm
resistor in it. This would draw 30-60 uA from the radio.

Also, the antenna schematic indicates that it is not possible to power the
antenna from the radio connection. (Although there could be different
versions of the antenna....)

FWIW the antenna's LED is powered with less than 1 mA.

The Sony radio schematics I looked at all have enough series resistance so
that shorting the antenna connection will not damage the radio. There is no
issue to settle.

craigm- Hide quoted text -

- Show quoted text -

Thanks, folks, for taking the time to delve into this a bit more
deeply. One question, though, even if the radio itself is in no risk
of any damage, could there possibly be any risk of damage to a non-
Sony amplified antenna that might be hooked up to this jack? i.e.
could this low-level current flowing out to the coax cable damage the
amplification unit of an active antenna?

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

On Jun 2, 9:22 am, junius wrote:
On Jun 1, 9:58 am, junius wrote:



On Jun 1, 1:45 am, "Adam" wrote:

If you use a random wire in the Sony 7600GR radio and accidently short it,
can it destory the radio and/or cause damage or is it protected?

In the manual it says it has DC power but on at least two websites, it
supposely only has a "sense power" to turn antennas off and on.

I called sony customer support and they claim the jack doesn't have any DC
power in it, that it is only reception. This was said by two different
agents, but when I emailed them, they keep talking about the headphone jack
for some reason.

Will someone please settle this for me, it's like some are saying it can
short and at the same time, some are saying it can't at all. I just want to
have this darn thing settled.

Thanks in advanced.

I guess this touches to the issue of Sony putting a DC voltage to the
antenna jacks to power the AN-LP series of antennas.

The antenna jack on the ICF-SW07 does incorporate a DC voltage to
power the supplied AN-LP2 antenna. The instruction manual accordingly
warns:

"Do not connect any other antennas other than the recommended active
antennas to the AM EXT ANT jack of the unit, as the jack supplies DC
voltage to power the recommended active antennas."

Neither the instruction manual to the ICF-SW7600G nor that for the ICF-
SW7600GR has any similar such disclaimer.

In hooking up the AN-LP1 antenna to the ICF-SW7600GR, I have found
that the radio does not power the antenna. The antenna requires its
own batteries (unlike the AN-LP2 which can be powered directly by the
'SW07).- Hide quoted text -

- Show quoted text -

Heckfire, I should post messages while at work... A mistake here...
The manual for the SW7600GR does have one of these disclaimers, now
doesn't it? Worded as such: "Do not connect external antennas other
than those recommended to the AM EXT ANT jack. This jack outputs DC
voltage for antenna power supply."

Interestingly, the '7600G manual, dated 1994, has no such warning, and
in fact has instructions for the use of the '7600G with the old AN-1
amplified antenna, among others.

In any case, both radios behave in entirely the same manner when in
use with the AN-LP1.

Dear Junius,

You are quite correct about the warning in the '7600GR's manual. I do
not have at hand my '7600G's manual but I know you are correct there
too, especially considering the fact that the AN-LP1 had not yet been
introduced when the '7600G's manual was written (and to my knowledge
it was never revised)

The warning is plain silly however. It is almost akin to what we read
back in the old days "for best results use Columbia needles" or "for
best results use RCA tubes" but the warning in the manual is much more
explicit, wrongheaded though it is.

It has been my personal (though limited) experience that ANY
reasonable antenna, to which one can attach a 3.5mm plug, can, in
fact, be used with excellent results with the ICF-SW7600G/GR. In my
opinion, the best overall match is the AN-LP1 but others have much
more experience than I do with using other antennas with these radios.

By the way, my name is actually spelled "Analssandrini" not
"Alessandrini." I will say that this spelling error is quite common.
You ought to see some of my junk mail. There are even more "creative"
misspellings of my name!

Best,

Joe

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

On Jun 2, 9:48 pm, junius wrote:
On Jun 2, 8:40 pm, craigm wrote:



From
http://groups.google.com/group/rec.r...dfd16b3dca3750
b3?dmode =source

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA DC current to the external antenna circuit. The coil is to
prevent "polluting" the power circuit of the radio with radio
frequency signal. Evidently, the purpose of this arrangement is to
"inform" the accessory antenna when the radio is turned on. In case
of the Sony AN-LP1 it turns on the antenna without need to use the
antenna power switch. However, the 7600G will NOT power the antenna,
the 10 mA are not enough to power the amplifier circuit. The power
for the AN-LP1 comes from its own batteries. You can use this
feature with any active antenna by including a proper power-up
circuit - a nice feature if your active antenna is located far away
from the radio and you want it to turn on and off automatically when
you use your radio.

This does not sound right to me. A power detect circuit would only need
micro-amps not 10 ma. 10 ma is respectable power for a simple amplifier.

According to the schematic for the antenna, only 6.4 mA is drawn from the
batteries ( 3 volts) when turned on.

The sense circuit to turn on the antenna from a radio has a 100 kohm
resistor in it. This would draw 30-60 uA from the radio.

Also, the antenna schematic indicates that it is not possible to power the
antenna from the radio connection. (Although there could be different
versions of the antenna....)

FWIW the antenna's LED is powered with less than 1 mA.

The Sony radio schematics I looked at all have enough series resistance so
that shorting the antenna connection will not damage the radio. There is no
issue to settle.

craigm- Hide quoted text -

- Show quoted text -

Thanks, folks, for taking the time to delve into this a bit more
deeply. One question, though, even if the radio itself is in no risk
of any damage, could there possibly be any risk of damage to a non-
Sony amplified antenna that might be hooked up to this jack? i.e.
could this low-level current flowing out to the coax cable damage the
amplification unit of an active antenna?

Dear Junius,

I have used two non-Sony active antennas with in conjunction with my
Sony ICF-SW7600GRs. One is my Wellbrook ALA 330S.. Believe me, if I
thought that there might be even the slightest problem, I should have
never tried it. After all, the antenna costs over $300.00! But, of
course, there is no problem whatsoever in using this (or probably any)
active amplified antenna with the Sony, other than the problem of
needing three Radio Shack adapters to hook the Wellbrook, with its
PL-259 plug to the Sony with its 3.5mm socket!

The other non-Sony amplified antenna I have tried is my AOR WL500
Window Loop antenna. This also works extremely well, in fact, even
better than the AN-LP1. There are certain difficulties with this
antenna which preclude me from using it on an ongoing basis, but its
performance is absolutely first-rate. There one needs two Radio Shack
adapters to go from a BNC connector to the 3.5mm jack.

This was an interesting question. Has anyone else used any other non-
Sony amplified antennas with the '7600G/GRs? I would be very
interested in hearing the experiences of owners of the AOR LA-380.

Best,

Joe

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

junius wrote:


Thanks, folks, for taking the time to delve into this a bit more
deeply. One question, though, even if the radio itself is in no risk
of any damage, could there possibly be any risk of damage to a non-
Sony amplified antenna that might be hooked up to this jack? i.e.
could this low-level current flowing out to the coax cable damage the
amplification unit of an active antenna?


That would depend upon the antenna. However, the most power that would be
delivered to the antenna would be maybe 40 mW.

Craigm

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

In article ,
craigm wrote:

From
http://groups.google.com/group/rec.r...dfd16b3dca3750
b3?dmode =source

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA DC current to the external antenna circuit. The coil is to
prevent "polluting" the power circuit of the radio with radio
frequency signal. Evidently, the purpose of this arrangement is to
"inform" the accessory antenna when the radio is turned on. In case
of the Sony AN-LP1 it turns on the antenna without need to use the
antenna power switch. However, the 7600G will NOT power the antenna,
the 10 mA are not enough to power the amplifier circuit. The power
for the AN-LP1 comes from its own batteries. You can use this
feature with any active antenna by including a proper power-up
circuit - a nice feature if your active antenna is located far away
from the radio and you want it to turn on and off automatically when
you use your radio.

This does not sound right to me. A power detect circuit would only need
micro-amps not 10 ma. 10 ma is respectable power for a simple amplifier.



According to the schematic for the antenna, only 6.4 mA is drawn from the
batteries ( 3 volts) when turned on.

The sense circuit to turn on the antenna from a radio has a 100 kohm
resistor in it. This would draw 30-60 uA from the radio.

Also, the antenna schematic indicates that it is not possible to power the
antenna from the radio connection. (Although there could be different
versions of the antenna....)

FWIW the antenna's LED is powered with less than 1 mA.

The Sony radio schematics I looked at all have enough series resistance so
that shorting the antenna connection will not damage the radio. There is no
issue to settle.

30-60 uA for a "sense circuit" makes more sense than 10 mA.

I have only used a roll-up single wire external antenna with the radio
connected to the tip of the antenna jack. If I decide to connect a
closed loop antenna like a folded dipole I'll use a series capacitor so
not to waste battery power.

--
Telamon
Ventura, California

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

"Telamon" schreef in bericht
...
In article ,
craigm wrote:

From
http://groups.google.com/group/rec.r...dfd16b3dca3750
b3?dmode =source

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA DC current to the external antenna circuit. The coil is to
prevent "polluting" the power circuit of the radio with radio
frequency signal. Evidently, the purpose of this arrangement is to
"inform" the accessory antenna when the radio is turned on. In case
of the Sony AN-LP1 it turns on the antenna without need to use the
antenna power switch. However, the 7600G will NOT power the antenna,
the 10 mA are not enough to power the amplifier circuit. The power
for the AN-LP1 comes from its own batteries. You can use this
feature with any active antenna by including a proper power-up
circuit - a nice feature if your active antenna is located far away
from the radio and you want it to turn on and off automatically when
you use your radio.

This does not sound right to me. A power detect circuit would only need
micro-amps not 10 ma. 10 ma is respectable power for a simple amplifier.



According to the schematic for the antenna, only 6.4 mA is drawn from the
batteries ( 3 volts) when turned on.


The 'live' antenna imput of this radio is useful for a very simple home-built active
antenna.

http://groups.google.com/group/rec.r...d/5bb2bb0dc933
e3c5/e363b5117ffea249?lnk=st&q=&rnum=1&hl=nl#e363b5117f fea249

--
Greetings from Groningen ^top^ of Holland

MRe

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

In article ,
"MRe" wrote:

"Telamon" schreef in bericht
...
In article ,
craigm wrote:

From
http://groups.google.com/group/rec.r...dfd16b3dca3750
b3?dmode =source

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA DC current to the external antenna circuit. The coil is to
prevent "polluting" the power circuit of the radio with radio
frequency signal. Evidently, the purpose of this arrangement is to
"inform" the accessory antenna when the radio is turned on. In case
of the Sony AN-LP1 it turns on the antenna without need to use the
antenna power switch. However, the 7600G will NOT power the antenna,
the 10 mA are not enough to power the amplifier circuit. The power
for the AN-LP1 comes from its own batteries. You can use this
feature with any active antenna by including a proper power-up
circuit - a nice feature if your active antenna is located far away
from the radio and you want it to turn on and off automatically when
you use your radio.

This does not sound right to me. A power detect circuit would only need
micro-amps not 10 ma. 10 ma is respectable power for a simple
amplifier.



According to the schematic for the antenna, only 6.4 mA is drawn from the
batteries ( 3 volts) when turned on.


The 'live' antenna imput of this radio is useful for a very simple home-built
active
antenna.

http://groups.google.com/group/rec.r.../thread/5bb2bb
0dc933
e3c5/e363b5117ffea249?lnk=st&q=&rnum=1&hl=nl#e363b5117f fea249


It's got to be in english for me to understand it.

You can stop links in post from breaking by putting at the beginning
and at the end in any decent news reader. For example:
http://groups.google.com/group/rec.r...thread/thread/
5bb2bb0dc933e3c5/e363b5117ffea249?lnk=st&q=&rnum=1&hl=nl#e363b5117f fea249


--
Telamon
Ventura, California

Sony 7600GR External Antenna Jack, Needs to be settled, Can it be shorted out to the point that it destroys the radio.
 

On Jun 3, 3:01 pm, Telamon
wrote:
In article ,





"MRe" wrote:
"Telamon" schreef in bericht
...
In article ,
craigm wrote:

From
http://groups.google.com/group/rec.r...dfd16b3dca3750
b3?dmode =source

1.- The ext. antenna socket is "hot", i.e. powered through a 470 ohm
resistence + 100 uH coil. This means that it will deliver approx. 10
mA DC current to the external antenna circuit. The coil is to
prevent "polluting" the power circuit of the radio with radio
frequency signal. Evidently, the purpose of this arrangement is to
"inform" the accessory antenna when the radio is turned on. In case
of the Sony AN-LP1 it turns on the antenna without need to use the
antenna power switch. However, the 7600G will NOT power the antenna,
the 10 mA are not enough to power the amplifier circuit. The power
for the AN-LP1 comes from its own batteries. You can use this
feature with any active antenna by including a proper power-up
circuit - a nice feature if your active antenna is located far away
from the radio and you want it to turn on and off automatically when
you use your radio.

This does not sound right to me. A power detect circuit would only need
micro-amps not 10 ma. 10 ma is respectable power for a simple
amplifier.

According to the schematic for the antenna, only 6.4 mA is drawn from the
batteries ( 3 volts) when turned on.

The 'live' antenna imput of this radio is useful for a very simple home-built
active
antenna.

http://groups.google.com/group/rec.r...se_thread/thre...
0dc933
e3c5/e363b5117ffea249?lnk=st&q=&rnum=1&hl=nl#e363b5117f fea249

It's got to be in english for me to understand it.

You can stop links in post from breaking by putting at the beginning
and at the end in any decent news reader. For example:
- http://groups.google.com/group/rec.r...browse_thread/
thread/5bb2bb0dc933e3c5/e363b5117ffea249?
lnk=st&q=&rnum=1&hl=nl#e363b5117ffea249




--
Telamon
Ventura, California- Hide quoted text -

- Show quoted text -

German-to-English via AltaVista "Babel Fish" Translation
http://groups.google.com/group/rec.r...63b5117ffea249

Hello dear OM's and user of Sony world receivers, with the study of
the connection diagram of a SONY ICF-7600G, daá the socket of the
external antenna was noticeable to me by a 470-Ohm resistance and a
100-uH throttle with the internal tension is connected by approx. 6V!
That walk naturally after the Anschluá of one active threshing floor
with remote supply. First attempts with a low-noise universal
transistor (BC 239 or BC 549) brought surprisingly good results. The
circuit could be hardly simpler, since the Collector resistance is
present already together with uncoupling in the Empf"nger. Only for
the base voltage muá to be still provided. Naturally one is in such a
manner "primitive" circuit which the Groásignalverhalten concerns
beyond of property and bad to settle. But for the vacation far
starting from the civilization and groáen radio stations, the circuit
is suitable better than then Y throw Y. Even with an additional
entrance filter for the delimitation of the range on approx.. 3-30 MHz
(against strong medium-wave transmitters), the circuit with something
fate in a 3,5mm jack plug laeát itself accommodates. With 75cm the
whole thing less place in the luggage takes wire away as antenna and
an appropriate 50-Ohm extension line from RG-174 than the SONY Jojo
during clear level rise. One can fasten the antenna with suction cup,
Klipse or plaster to the window and one needs no more wires by the
hotel room to then stretch.

Here now the really simple circuit:
V 0,5 - 1m 220k ---
| Draht ____ | 50 Ohm
| -|____|-o-------------o Ausgang
| | | |
| 100pF 470pF | C / ---
| | | / |
| || || | B |/ |
-----------||---o---||---o----| BC239 o.i. |
|| | || |\ |
| | | \ |
| | E \ |
10uH | | | |
|_| | |
| | |
o-----------------o-------------

Attention that the internal tension is switched off with FM
enterprise, functions the whole only to 30 MHz. Who would like to hear
also occasionally FM restaurant act ions, and no desire has
continuously umzustoepseln, muá still another additional filter for
the UKW range to construct themselves, and to above circuit parallel
put. If the antenna wire is made long then 75cm, it affects UKW as
passive 1/4-Lambda-Staebchen, thus daá the inserted teleskopantenne to
remain pushed in can. It would still interest me whether also
different then Y Y put such a phantom powering on the external antenna
socket. Perhaps the circuit can be used then also there. I had already
made myself a suitable jack plug with light emitting diode, in order
to test with a resident dealer times the world receivers. It had
however fear, daá I which make broken could, rear.

Much fun when tinkering and...
/_/_/__/__/__/__/ vy 73
/ / /! / / / / es
! 55 de David, DC4DKA @DB0OE.#NRW.DEU.EU
! Loc.JO31KL

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- - - - -

das ist alles völker ~ RHF
.
.
.. .