[Hallicrafters] RE: sx-117

[ah7i at atl.org]

Assuming he's got the right DC and heater voltages on the tubes... If his
AGC line is right and his first mixer and BFO injection levels are right,
then he needs to look at signal levels (stage gains). I suggest a back to
front approach with a signal generator as it's easier than front to back
with a RF/audio voltmeter. This way he can find the stadium which is in
error. I suspect by stadiums he means stages.

There is nothing magical about the SX-117 other than the nice design with
tracking first IF filter and the beautiful audio from LC filters as oposed
to mechanical.

He's probably got a bad tube (the only true test of a tube is how it
behaves in the circuit) or more likely low gain in one or more stadiums
owing to bad bypass cap or shorted IF resonance cap. This should be
noticable in tuning that stadium as the effexts would have been less than
for the other stadiums.

-bob
ah7i


On Fri, 16 Apr 2004, F W Mooney wrote:

> Can someone help Tony out?  Please email him directly.  Not sure what he means by "stadiums".
>
> - Fred M.  KA1DGL
>   HCI webmaster
> ----------
> From: 	Antonio Pilichi[SMTP:plcntn at jumpy.it]
> Sent: 	Friday, April 16, 2004 11:57 AM
> To: 	webmaster at w9wze.org
> Subject: 	sx-117
>
> to ALL de i5NQK
> Hallicrafters SX-117
> I have need of someone that knows very well the receiver SX-117
> I possess one of these apparatuses and I don't succeed to bring his
> sensibility as from characteristics of the manual.
> I have performed the settings of the various stadiums with a maniacal
> perfection having a well furnished a lot of laboratory. I have followed the
> journey of the signal, from the antenna to the BF and it seems all in the
> norm.
> Someone knows me to give information on the characteristics of the receiver
> and the possible measures in the stadiums. Naturally all the electronic
> tubes have been tried with the tubas tester.
> Thanks
> Tony
>
>
>
>
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