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