Brian,
You may be better served by using a bandpass filter - or in your case
a "band no-pass" filter. Something that attenuates signals below 2
MHz may be useful; just browsed the HRO and AES catalogs and did not
see one for that range though. Dale Parfitt, of PAR Electronics, pops
up on this ng from time to time; his company markets bandpass filters
for VHF/UHF that are highly regarded and perhaps he could help point
you in the right direction. PAR Electronics can be found at
http://www.parelectronics.com/index.htm , Dale is also now offering a
nice end-fed wire antenna you may wish to consider. You may also wish
to go to the library and see if they have the ARRL Antenna Book or
Amateur's Handbook - you might find something in there.

FWIW, I have a 7600G that when hooked to an inverted L also picked up
the local AM stations, the problem did not duplicate itself when I
attached the Alpha Delta sloper. The inverted L was grounded at the
feedpoint whereas the AD sloper has a 30' wire downlead to act as a
counterpoise - but is also attached to a ground rod (manufacturer
indicates you can either let the wire dangle or connect to ground).
Never did figure out why the problem existed but when I rewired the
balun on the inverted L with no DC continuity between input/outut the
problem went away. Perhaps this info will help you resolve your
issue.

Good luck,
Howard
On 28 Nov 2003 22:33:36 GMT, "Brian Sturges"
wrote:

I've been using the Sony 7600GR with a 40 FT outdoor wire fed into the house
with coax for awhile now. My results are OK most of the time- but I usaully
just leave the antenna input near the radio or use the attenuator. My
problem is strong interferance from local AM stations as I live in the
middle of a city of 250,000. Can anyone recommend a preselector or similar
device? I'm thinking of the MFJ-956. I've already been warned that these
gizmos won't take me to radio heaven. The Vectronics AT100 looks neat- but
I suppose I can't get away with using any gain? Also, I will soon be
re-installing my antenna because I'm moving my listening area to another
room: I wonder how important the direction of the wire antenna is? I live
in the Midwest, so many of my shortwave stations come from the east. It's
most conveniant for me to run the antenna east\west- but I could do it N\S
if the overall performance will make it worthwhile. I'd appreciate any
feedback on this- no, let's make that INPUT.
Thanks!
Brian

Sometimes I get AM popping up n the lower SW bands, but , when using a pre
selector
( MFJ 1046) it knocks down antenna input a bit. No free lunch;
- So I just listen to the murmering in the background.
Its a Much Bigger problem with my $11.00 Analogue / Digital display
JWIN JX -M14
- Wonder if I could hook up some ugly gaget to the Antenna input of the Jwin to
eliminate overload;

- Leaving just
the Crop Circle / Chemtrail / New World Order /
Economic apocolypse / Bible Thumping ,Money Grubbing signals
of Domestic SWR programs..

& of course 12095 broadcasting the BBC from Ascension Island;
off the west coast of Africa
& 7415, WBCQ, Monticello Maine on weekends

Dan ( Just GOT to get a life...!)


In article , "Brian Sturges"
writes:


I've been using the Sony 7600GR with a 40 FT outdoor wire fed into the house
with coax for awhile now. My results are OK most of the time- but I usaully
just leave the antenna input near the radio or use the attenuator. My
problem is strong interferance from local AM stations as I live in the
middle of a city of 250,000. Can anyone recommend a preselector or similar
device? I'm thinking of the MFJ-956. I've already been warned that these
gizmos won't take me to radio heaven. The Vectronics AT100 looks neat- but
I suppose I can't get away with using any gain? Also, I will soon be
re-installing my antenna because I'm moving my listening area to another
room: I wonder how important the direction of the wire antenna is? I live
in the Midwest, so many of my shortwave stations come from the east. It's
most conveniant for me to run the antenna east\west- but I could do it N\S
if the overall performance will make it worthwhile. I'd appreciate any
feedback on this- no, let's make that INPUT.
Thanks!
Brian

Howard wrote:

Brian,
You may be better served by using a bandpass filter - or in your case
a "band no-pass" filter. Something that attenuates signals below 2
MHz may be useful; just browsed the HRO and AES catalogs and did not
see one for that range though. Dale Parfitt, of PAR Electronics, pops
up on this ng from time to time; his company markets bandpass filters
for VHF/UHF that are highly regarded and perhaps he could help point
you in the right direction. PAR Electronics can be found at
http://www.parelectronics.com/index.htm , Dale is also now offering a
nice end-fed wire antenna you may wish to consider. You may also wish
to go to the library and see if they have the ARRL Antenna Book or
Amateur's Handbook - you might find something in there.

FWIW, I have a 7600G that when hooked to an inverted L also picked up
the local AM stations, the problem did not duplicate itself when I
attached the Alpha Delta sloper. The inverted L was grounded at the
feedpoint whereas the AD sloper has a 30' wire downlead to act as a
counterpoise - but is also attached to a ground rod (manufacturer
indicates you can either let the wire dangle or connect to ground).
Never did figure out why the problem existed but when I rewired the
balun on the inverted L with no DC continuity between input/outut the
problem went away. Perhaps this info will help you resolve your
issue.

Good luck,
Howard

Par makes a BCB filter for SW - it's just under $50

http://www.rffun.com/catalog/filters/4426.html

The Par BCST-HPF is designed to help shortwave listeners cope with interference from stations under 1700 kHz ... especially nearby AM stations. Strong AM stations may cause the front-end of a receiver to overload. This may cause an AM (medium wave) station
to appear on the shortwave band.

The Par BCST-HPF is a 7 pole elliptic filter designed to eliminate AM broadcast station problems on shortwave. The housing has an SO-239 jack for input and one for output (accepts standard PL259 plugs). A bypass toggle switch is featured to take the filter
out of line.

The bandpass is 1.8 to 200 MHz.
The minimum attenuation for below 1700 kHz is 41 dB.
The notch band is 0 kHz to 1700 kHz.

Diverd4777 wrote:

Sometimes I get AM popping up n the lower SW bands, but , when using a pre
selector
( MFJ 1046) it knocks down antenna input a bit. No free lunch;
- So I just listen to the murmering in the background.
Its a Much Bigger problem with my $11.00 Analogue / Digital display
JWIN JX -M14

I have problems with a nearby FM radio tower, but only on my 396. My
FRG8800 is hooked to a NW/SE 50ft longwire and has no interference
problems. Go figure.

- Wonder if I could hook up some ugly gaget to the Antenna input of the Jwin to
eliminate overload;

I think the problem is with cheap front ends on portables. They're
easily overloaded, probably because only one transistor is likely used.

- Leaving just
the Crop Circle / Chemtrail / New World Order /
Economic apocolypse / Bible Thumping ,Money Grubbing signals
of Domestic SWR programs..

That wouldn't be very interesting.

& of course 12095 broadcasting the BBC from Ascension Island;
off the west coast of Africa
& 7415, WBCQ, Monticello Maine on weekends

Dan ( Just GOT to get a life...!)

When you become intimately familiar with which kook is which on domestic
SW, it's a clear sign that you need to step away from the radio and get
some fresh air outside (you know outside, it's where that big glowing
ball in the sky is).



In article , "Brian Sturges"
writes:


I've been using the Sony 7600GR with a 40 FT outdoor wire fed into the house
with coax for awhile now. My results are OK most of the time- but I usaully
just leave the antenna input near the radio or use the attenuator. My
problem is strong interferance from local AM stations as I live in the
middle of a city of 250,000. Can anyone recommend a preselector or similar
device? I'm thinking of the MFJ-956. I've already been warned that these
gizmos won't take me to radio heaven. The Vectronics AT100 looks neat- but
I suppose I can't get away with using any gain? Also, I will soon be
re-installing my antenna because I'm moving my listening area to another
room: I wonder how important the direction of the wire antenna is? I live
in the Midwest, so many of my shortwave stations come from the east. It's
most conveniant for me to run the antenna east\west- but I could do it N\S
if the overall performance will make it worthwhile. I'd appreciate any
feedback on this- no, let's make that INPUT.
Thanks!
Brian

At the length you are using, it won't matter what direction you run the
wire. The preselector will work but an easier solution would be a band
filter. No knobs to mess with.

"Brian Sturges" wrote in message
...
I've been using the Sony 7600GR with a 40 FT outdoor wire fed into the
house
with coax for awhile now. My results are OK most of the time- but I
usaully
just leave the antenna input near the radio or use the attenuator. My
problem is strong interferance from local AM stations as I live in the
middle of a city of 250,000. Can anyone recommend a preselector or
similar
device? I'm thinking of the MFJ-956. I've already been warned that these
gizmos won't take me to radio heaven. The Vectronics AT100 looks neat-
but
I suppose I can't get away with using any gain? Also, I will soon be
re-installing my antenna because I'm moving my listening area to another
room: I wonder how important the direction of the wire antenna is? I live
in the Midwest, so many of my shortwave stations come from the east. It's
most conveniant for me to run the antenna east\west- but I could do it N\S
if the overall performance will make it worthwhile. I'd appreciate any
feedback on this- no, let's make that INPUT.
Thanks!
Brian

In article , tommyknocker
writes:

That wouldn't be very interesting.

& of course 12095 broadcasting the BBC from Ascension Island;
off the west coast of Africa
& 7415, WBCQ, Monticello Maine on weekends

Dan ( Just GOT to get a life...!)

When you become intimately familiar with which kook is which on domestic
SW, it's a clear sign that you need to step away from the radio and get
some fresh air outside (you know outside, it's where that big glowing
ball in the sky is).


Dan ( Just GOT to get a life...!)

When you become intimately familiar with which kook is which on domestic
SW, it's a clear sign that you need to step away from the radio and get
some fresh air outside (you know outside, it's where that big glowing
ball in the sky is).



Yeah, I gotta go outside some more...
- Take out the Garbage Chinese Food & Pizza Boxes,

re - arrange the refrigerator Collection on the Front Porch

- Look up in the Sky for Chemtrails..

Outside.. yeah..

" Hey Officer !
Still a sittin out there cross the street?
Pretty safe Neighborhood with You around.."
keep up the Good Work!,
None o them Little green men
been
Buggering The Dog or anything since you been around..
Well
Kmart's having a Special on Aluminum Foil, Gotta Skedaddle !"

At the length you are using, it won't matter what direction you run the
wire. The preselector will work but an easier solution would be a band
filter. No knobs to mess with.


I always thought that messing with knobs was part of the attraction of radio.

Must be just me then ... the more knobs and switches the better !!

jw
wb9uai

Thanks Howard! I think I should try that AD Sloper first- it sure got a
good review in the 2003 Passport.

Excellent antenna Brian, you can't go wrong with it. Traps are sealed, good
construction, built like a battleship.

I've had mine up for almost four years now and haven't had a problem with it.
Just string it up and plug it in. :-)

How much does this antenna cost? I also have a Sony 7600G.

philly45
"Howard" wrote in message
...
Brian,
You may be better served by using a bandpass filter - or in your case
a "band no-pass" filter. Something that attenuates signals below 2
MHz may be useful; just browsed the HRO and AES catalogs and did not
see one for that range though. Dale Parfitt, of PAR Electronics, pops
up on this ng from time to time; his company markets bandpass filters
for VHF/UHF that are highly regarded and perhaps he could help point
you in the right direction. PAR Electronics can be found at
http://www.parelectronics.com/index.htm , Dale is also now offering a
nice end-fed wire antenna you may wish to consider. You may also wish
to go to the library and see if they have the ARRL Antenna Book or
Amateur's Handbook - you might find something in there.

FWIW, I have a 7600G that when hooked to an inverted L also picked up
the local AM stations, the problem did not duplicate itself when I
attached the Alpha Delta sloper. The inverted L was grounded at the
feedpoint whereas the AD sloper has a 30' wire downlead to act as a
counterpoise - but is also attached to a ground rod (manufacturer
indicates you can either let the wire dangle or connect to ground).
Never did figure out why the problem existed but when I rewired the
balun on the inverted L with no DC continuity between input/outut the
problem went away. Perhaps this info will help you resolve your
issue.

Good luck,
Howard
On 28 Nov 2003 22:33:36 GMT, "Brian Sturges"
wrote:

I've been using the Sony 7600GR with a 40 FT outdoor wire fed into the
house
with coax for awhile now. My results are OK most of the time- but I
usaully
just leave the antenna input near the radio or use the attenuator. My
problem is strong interferance from local AM stations as I live in the
middle of a city of 250,000. Can anyone recommend a preselector or
similar
device? I'm thinking of the MFJ-956. I've already been warned that these
gizmos won't take me to radio heaven. The Vectronics AT100 looks neat-
but
I suppose I can't get away with using any gain? Also, I will soon be
re-installing my antenna because I'm moving my listening area to another
room: I wonder how important the direction of the wire antenna is? I
live
in the Midwest, so many of my shortwave stations come from the east. It's
most conveniant for me to run the antenna east\west- but I could do it
N\S
if the overall performance will make it worthwhile. I'd appreciate any
feedback on this- no, let's make that INPUT.
Thanks!
Brian