[R-390] R-390a Image problem?

[Tony Casorso]

Hi Bob, I'm using the balanced input. I bought a twinax to BNC adapter so 
one side of the balanced input is grounded.

Same antenna doesn't bother the R-392.

Tony


----- Original Message ----- 
From: "Bob Camp" <ham at cq.nu>
To: "Tony Casorso" <canthony15 at msn.com>
Cc: <R-390 at mailman.qth.net>
Sent: Friday, October 19, 2007 6:52 PM
Subject: Re: [R-390] R-390a Image problem?


> Hi
>
> Which antenna input are you running into? The situation you describe 
> would be pretty typical if you run a long antenna into the  "unbalanced" 
> input.
>
> Bob
>
>
> On Oct 19, 2007, at 8:31 PM, Tony Casorso wrote:
>
>> Hi everyone. This is my first post to the list although I've been 
>> following it for a long time now. A few months back I bought a 67  EAC 
>> R-390a. The only problem I had was an open Z-503 AGC coil. I  replaced 
>> that and did an alignment and the radio seemed to be  working real well. 
>> Sensitivity was very good on all bands. Recently  I've noticed broadcast 
>> stations coming through in the 3Mhz band. A  local station on 1650KHz is 
>> about 40db at 3300KHz on the R-390a. I  don't hear it on my R-392. Even 
>> moving the 2-4MHz RF slug rack by  hand, I still hear the station 
>> (although it does get a bit  quieter). There are several other stations 
>> coming through as well  on other frequencies. I didn't notice anything 
>> odd when I aligned  it, everything seemed to peak like it should. Looking 
>> around at  other frequencies with my signal generator, I started noticing 
>> all  kinds of harmonic responses, but that is probably (at least to some 
>> degree) just my signal generator (a Boonton 102C). I'm pretty sure 
>> something is wrong here but I'm scratching my head trying to think  of a 
>> good explanation. If the BC station harmonic was that bad, I'd  hear it 
>> in my other radios I would think.
>>
>> Ideas anyone? How do I track this one down?
>>
>> Thanks,
>>
>> Tony
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>