Kenwood TM-g707 strong signal performance

Kenwood TM-g707 strong signal performance

Post by Martin John Hallswort » Fri, 28 Jul 2000 04:00:00

Hello all,

I have a question about the Kenwood TM-g707 strong signal
performance.
Before I bought the rig an other local amateur said that he had
been told that the front end on this rig was "as wide as a barn door"
I have not noticed any problems with the rig until this last week end
when I was at the RIAT airshow at RAF Cottesmore where I could
hear what appeared to be the communications traffic from the gate
marshals / ambulance / etc on the 70cm band while listening to the
repeaters around the area.
The rig has not been modified to give the extended / AM receive
although air band AM RX would be of interest.
OK so my questions :-

Has any one had similar experience ?

I suspect that it is an IF image channel problem is this right ?

or is it overload of the RX amp in the front end ?

and where can I get hold of a circuit diagram as one is not supplied
with the rig.

cheers Martin G1GYC

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Kenwood TM-g707 strong signal performance

Post by Digimo » Sat, 29 Jul 2000 04:00:00


Be sure you have AIP turned on :)



Quote:> Hello all,

> I have a question about the Kenwood TM-g707 strong signal
> performance.
> Before I bought the rig an other local amateur said that he had
> been told that the front end on this rig was "as wide as a barn door"
> I have not noticed any problems with the rig until this last week end
> when I was at the RIAT airshow at RAF Cottesmore where I could
> hear what appeared to be the communications traffic from the gate
> marshals / ambulance / etc on the 70cm band while listening to the
> repeaters around the area.
> The rig has not been modified to give the extended / AM receive
> although air band AM RX would be of interest.
> OK so my questions :-

> Has any one had similar experience ?

> I suspect that it is an IF image channel problem is this right ?

> or is it overload of the RX amp in the front end ?

> and where can I get hold of a circuit diagram as one is not supplied
> with the rig.

> cheers Martin G1GYC

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

> REMOVE "NOSPAM" from return email before sending

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 
 
 

Kenwood TM-g707 strong signal performance

Post by Robert Hufnage » Sat, 29 Jul 2000 04:00:00

I have one and it does pick up a lot of intermod.  There is a button that
you can push that does help to reduce the amount of intermod that it picks
up but it also reduces the sensitivity.  I have to do this and run a tight
squelch to cut down on the intermod, but then I have a hard time with the
repeaters.  This is mostly on 2M.  I have a friend that has one he uses a
440 repeater most of the time with pl on both encode and decode so it is not
that much of a problem for him. As for me I am going to sell mine. Just my
$.02.
Bob   KC6TJK


Quote:> Hello all,

> I have a question about the Kenwood TM-g707 strong signal
> performance.
> Before I bought the rig an other local amateur said that he had
> been told that the front end on this rig was "as wide as a barn door"
> I have not noticed any problems with the rig until this last week end
> when I was at the RIAT airshow at RAF Cottesmore where I could
> hear what appeared to be the communications traffic from the gate
> marshals / ambulance / etc on the 70cm band while listening to the
> repeaters around the area.
> The rig has not been modified to give the extended / AM receive
> although air band AM RX would be of interest.
> OK so my questions :-

> Has any one had similar experience ?

> I suspect that it is an IF image channel problem is this right ?

> or is it overload of the RX amp in the front end ?

> and where can I get hold of a circuit diagram as one is not supplied
> with the rig.

> cheers Martin G1GYC

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

> REMOVE "NOSPAM" from return email before sending

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 
 
 

Kenwood TM-g707 strong signal performance

Post by Martin John Hallswort » Sat, 29 Jul 2000 04:00:00


>Be sure you have AIP turned on :)

Yep .... I did have the AIP turned on.....
did improve the situation (lowered the apparent strength
of the interfering signal)

but that has not answered my original questions.

Martin

 
 
 

Kenwood TM-g707 strong signal performance

Post by Digimo » Sat, 29 Jul 2000 04:00:00

I have read over the few years about this.  I have had a TMG707 and a TMV7a
for 2 years and have never had a problem.. But that is because I live in a
RF sparse area (lightly populated) .  years ago, when I lived in Dallas, I
couldn't find a radio that would let me drive through downtown without
getting clobbered.  I don't think there are any miracles that guarantee no
intermod in any RF environment.

I have modified both my rigs to be wide band rx - and still have yet to hear
a problem.

so it is kinda an answer in the negative sense,  Yes, I have NOT experienced
a similar problem.  But, RF circumstances dictate everything.

Since you only experienced this once, in a high RF environment, then perhaps
it is something to live with now and then.

I still think it is a fine radio.  I won't sell mine for a long time.   my
$0.02 as well.

cheers




> >Be sure you have AIP turned on :)

> Yep .... I did have the AIP turned on.....
> did improve the situation (lowered the apparent strength
> of the interfering signal)

> but that has not answered my original questions.

> Martin

 
 
 

Kenwood TM-g707 strong signal performance

Post by Louis Bybe » Sun, 30 Jul 2000 04:00:00


> I have read over the few years about this.  I have had a TMG707 and a TMV7a
> for 2 years and have never had a problem.. But that is because I live in a
> RF sparse area (lightly populated) .  years ago, when I lived in Dallas, I
> couldn't find a radio that would let me drive through downtown without
> getting clobbered.  I don't think there are any miracles that guarantee no
> intermod in any RF environment.

If you are having Intermod problems, and are looking for a solution,
EMAIL me and I will tell you how I solved mine (I frequent one of the
worst Intermod Alleys).

Louis

> I have modified both my rigs to be wide band rx - and still have yet to hear
> a problem.

> so it is kinda an answer in the negative sense,  Yes, I have NOT experienced
> a similar problem.  But, RF circumstances dictate everything.

> Since you only experienced this once, in a high RF environment, then perhaps
> it is something to live with now and then.

> I still think it is a fine radio.  I won't sell mine for a long time.   my
> $0.02 as well.

> cheers




> > >Be sure you have AIP turned on :)

> > Yep .... I did have the AIP turned on.....
> > did improve the situation (lowered the apparent strength
> > of the interfering signal)

> > but that has not answered my original questions.

> > Martin