[time-nuts] HP 3586 entirely referenced to 10MHz...

[Burt I. Weiner]

Perry,

Marv W6OQI and Stu K6YAZ and I looked at ways to either stabilize the 
Product Detector's L.O or devise a scheme to derive the necessary 
L.O. frequencies from the reference.  Short of creating a monster of 
a science project, there's no simple way to get there.  Stu made a 
comment that there's nothing sacred about the 1850 Hz tone.  You 
could change the L.O. to produce any tone within the systems (audio) 
bandpass and have it work - as long as you know what the offset is 
that results from the "new" tone and apply that to your 
calculations.  If that's all you wanted to use the receiver for that 
would be ok.

The downside of that is that the reproduced audio would contain an 
error, much like a SSB receiver that is improperly tuned.  Remember 
that the L.O. is replacing the carrier that would normally be present 
in AM signal.  It needs to be at precisely the right place relative 
to the sidebands in order for the demodulated audio to be 
correct.  Even a small amount of error, one that would not be obvious 
to the ear but could produce a sizable amount of error for this 
groups demands for accuracy.

For me the HP-3586B is a tool, a wonderful tool.



>For the present I plan on using the measurement technique that Burt 
>Weiner K6OQK so graciously shared on the net and to us on the 
>list.  Locking my 3586 and 3336 to my GPSDO should allow me to get 
>good results.  I also can compare my first GPSDO to a second 
>redundant GPDSO.  This I can understand and do.
>
>Regards,
>
>Perrier
>
>
>
>
>

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at att.net
www.biwa.cc
K6OQK