[ARC5] Oscillator Stability and Old-Time gear. (Was OT: Hally Instability)

[Kenneth G. Gordon]

Thank you, Bob. Lots of work and I, for one, appreciate it. I would be 
interested in some sort of comparison of the receivers in your list vs some 
strictly-military receivers some time. I suspect the military jobs would be, 
overall, better than the average civilian ones.

Ken W7EKB


On 16 Nov 2015 at 22:45, Bob via ARC5 wrote:

> Hi to all
> 
> 
>  Been an avid readier of the ongoing discussion on receiver drift
>  characteristics of both the old stuff vs the new stuff and it's piqued my
>  curiosity so I thought I'd set up a bunch of my junk on the bench and do a
>  stability comparison on both a lot of the older units, many that have been
>  mentioned, and perhaps a few that have not.  The criteria will be a nominal
>  ambient environment that varies in temperature from around 60 degrees in the
>  early morning to around 70 degrees in the late afternoon.  I'll post the
>  ambient temperature with each tabulated reading.  The reference source will be
>  my Rubidium Standard.  The first run will be in the center of the 80 meter band
>  3.7 MHz and the second run will be at 14.2 MHz with a third and final run at 29
>  MHz. The Following receivers will be tested simultaneously :
> 
> 
> 1  Collins 51J4
> 2. Collins 75S3B
> 3. National NC303
> 4. Hallicrafters SX101A 
> 5 .Hallicrafters SX62A
> 6. Hallicrafters SX111
> 7 .Hallicrafters SX146
> 8 .Hammarlund HQ110
> 9. Hammarlund HQ129X
> 10. Hammarlund HQ215
> 11  Swan 600R Custom
> 12. Watkins Johnson 8718A
> 
> 
> Sorry that I don't have any Drake stuff to test nor am I planning any tests on
> older or newer transceivers.  
> 
> 
> All receivers will get a 2 hour warm up before starting the drift tests.  Drift
> measurements will be based on BFO beats as measured on an HP hight resolution
> counter with a rubidium time base.  I would imagine that some of the older units
> may drift out of their pass bands on the third test sequence (29 MHz)  and maybe
> even on the second test at 14.2 MHz.  Each test phase will last 1 hour. which
> will hopefully give the later test phases a bit more warm up time.  Total test
> time will be 2 hours initial and one hour for each phase.  Testing will begin
> next Monday, Nov 23,
> 
> 
> Thank you for the read and perhaps you'd like to speculate on how these boat
> anchors will tally up at the end.
> 
> 
>  73  Bob, KE6F
> 
> 
> 
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html



Kenneth G. Gordon W7EKB

"Courage is being scared to death but saddling up anyway."--- John   Wayne