[Premium-Rx] Fw: Harris RF-590 - Weak Reception

[Ahmet G.]

Hi Dan. 

Is this a Harris RF-590 ?   I am not familiar with an Harris RX.. series ?

If RF-590 and receive sensitivity diminishes with higher frequency,
I would personally check the IF stages, especially the Mixers starting
from the last IF stage Mixer.

I have seen many receivers with damaged Mixers performing in a similar manner.  Usually due to Lightning damage ( in general first Mixer ).

Assuming that your signal generator has a clean and low Phase Noise signal, then it may be a good idea to check the signal chain from the antenna input thru all IF stages. It is also good to make sure the signal generator has a clean signal you can use for this purpose.

Good luck.

Ahmet Gundes


> 
> 
> I have a RX-590 that receives sidebands plus and minus 20 kc. the lower the
> freq (about 1 MC) the stronger. the higher (10 MC) the freq weaker.
> 
>   For instance using a sig gen a 1 mc signal has a sideband signal at 980 and
> 1020. At 1 mc it is strong enough to also be heard on 960 and 1040.
> 
>   So far all the tantalum caps in the power supply board were replaced and
> the one in the crsytal oven. No change. Any ideas?
> 
> 
>   Dan K9DTC
> 
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