[Hallicrafters] SSB with SX-117

[Rodger]

Hi Anders,

When you say it sounds like a thief alarm was the receiver oscillating? 
It should be able to run at full RF gain without this happening. 
Hopefully this is something simple so first check to make sure that all 
of the tube shields are properly seated. I guess it might be possible to 
have it oscillate if the factory gain set control (R-19) is set too high 
though I have never tried this "experiment".

It is also possible that your AGC is not working properly. If the BFO 
appears to be working then tune in an SSB signal and increase the AF 
gain to near maximum and reduce the RF gain to reduce the volume and see 
if you can now understand the voices. If so then there is a problem in 
the AGC circuit.

Do you have another receiver that will tune down to 50 kilohertz where 
you can listen to see if the SX-117 BFO is working? Or you might try to 
listen to its 3'rd harmonic on around 150 kilohertz if you have a 
longwave receiver that covers that range, just connect a small antenna 
from the receiver to near the BFO/product detector tube (V11 6BE6). If 
you have an oscilloscope you could use this of course! If you determine 
that the BFO is working it may be off frequency and you can reset it as 
per page 19 of the manual.

I hope this helps!

Best wishes,
Rodger WQ9E

Anders E wrote:
> I have just bought my first Hallicrafter; the beautiful SX-117 
> receiver. It work great in AM mode, but I have not managed to make it 
> work properly in SSB. First it just sounded like a thief alarm, but 
> that was easily fixed by adjusting the RF gain. The problem is, that 
> it is possible to hear “voices” - but they sound like when you try to 
> listen to SSB in AM mode! It does not help to change the setting to 
> USB/LSB. What is wrong? Am I doing something wrong (I have only 
> experimented for a couple of hours so I still have a lot to learn!)?
>
> I also wonder if there is someone out there how knows were I can buy 
> crystals to change the receivers frequency range?
>
> Grateful for you help!
>
> Anders, Sweden
>
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