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

[Dennis Monticelli]

Would it be too much to ask to include a measurement from cold start to the
first hour point?  Just one band (say 20M).

We should enlist one of those on-line wagering apps for this dramatic event
:-)

Dennis AE6C

On Mon, Nov 16, 2015 at 7:45 PM, Bob via ARC5 <arc5 at mailman.qth.net> 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
>
>
>
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