[R-390] R-390A dB meter as as "S" meter

[David C. Hallam]

How do you calibrate your S meter.  I was trying to that on a 75S-3 and 
gave up other than to just set the IF gain to give a S9 reading when the 
meter on my HP-606B read 50 uV.

Since the 606B meter reading are accurate only when working into a 50 
ohm load, what load is the input circuit of the receiver?  Is it the 
same for all bands?  If you use a 50 ohm terminator for the signal 
generator, do you put it at the signal generator end of the coax 
connector or at the receiver end.  What is the impedance at the end of 
the piece of coax that connects the receiver to the signal generator? 
Etc, etc.

David
KW4DH

Gord Hayward wrote:

> I've enjoyed it - calibrating S-meters has been one of the things I like 
> to do.
> Its like the outside remote antenna tuner that I built for 80m.  I can 
> honestly
> claim SWR matches of 1.05:1.  Not meaningful but lots of neat bragging 
> rights.
> 
> In the matter of '59'  I remember getting into an AM pileup and after 
> many tries
> getting the contact who then gave me a '59'.  What can I say?
> 
> Cheers, Gord VE3EOS
> 

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