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

[Jon Schlegel]

Hi All,

Tony,  I'm brand new to the R-390 game so I speak only with regard to 
generalized receiver concepts.  It sounds as if somewhere there is a 
degrading ground connection.  As far as specifics go I can only say 
make sure module mounting is tight, cable shields are in good order, 
etc.  You may be able to divide and conquer by injecting signal 
downstream of the antenna and learn something that way.

Regards,
Jon


At 06:31 PM 10/19/2007 -0600, you 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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