[NLRS] 10 GHz contest spreadsheet

[Zack Widup]

I've been using the LM2940T-X.0 voltage regulators wherever I need a
lower voltage. Usually the 9.0 volt ones but occasionally the 8.0 volt
ones. For circuits where I have determined that a low supply voltage
will pull the LO frequency, I use a boost switching supply to generate
about 18 volts or so and then use the LM2940T-12.0 to maintain 12
volts and the others for lower voltages. This has made the LO stay
rock-solid down to 7 volts from the supply at the expense of drawing a
little more current. The LO's are also phase-locked to a 10 MHz OCXO.

Activity along the Lake Michigan lakefront was nowhere near what you
folks experienced in your area. I ended up with about 11,000 points.
But it was a blast and well worth it to make 18 QSO's on 24 GHz in
addition to the 10 GHz ones.

73, Zack W9SZ


On 10/26/15, Dr. Gerald N. Johnson <geraldj at netins.net> wrote:
>
>
> I sent in a paper log, and I used N0UK's web page for computing
> distances. Final score about 60,140 points, not enough to beat Gary but
> a pretty good showing. I'm working on the rig trying to find out why it
> seemed to quit working at Storm Lake on Saturday in September. Battery
> voltage was a bit low and I need to make sure the charging circuit
> charges. For that I have mounted a Radio City miniature digital meter in
> a box with long leads so I can hand that box at the front glass of the
> pickup topper and see it from the cab to see if the voltage rises while
> driving. I'm also testing the transverter, PA, and FT-857 at low
> voltage. While the 857 spec is 13.8 +/- 15% which puts a lower limit at
> 11.7 volts it doesn't lose sensitivity or frequency control down to 9
> volts supply. And listening at 1136 MHz the transverter crystal still
> controls the frequency, moving about 1.4 kHz from the frequency with 12
> volts. That doesn't match my counter display a few years ago of moving
> 100 kHz per 1 second counter gate. I suspect now that low supply is
> dropping the 9 volts to the multiplier MMICs and killing the transmit
> and receiver mixer LO drive and so its "gain" with a great deal more
> loss. Will have to do more sophisticated testing to see that. The 1136
> signal radiated to an external receiver stay up until the supply voltage
> got down under 7 volts. The multipliers all depend on a 78S09 that needs
> a couple volts of headroom. I think a low dropout regulator in its place
> could solve my problem, or a small battery booster if it doesn't create
> too much RF noise. I found some boost regulator boards rated at a couple
> amps from Marlin P Jones a few months ago. I bought AC line filters to
> clean up the input and output once I put one or two in a shielded box,
> if I go that way.
>
> I did make a little test run of John's software that I downloaded and it
> seemed to work.
>
> 73, Jerry, K0CQ
>
> On 10/26/2015 10:28 PM, John Toscano wrote:
>>
>>
>> Folks, I sincerely apologize for not keeping up with my email, in
>> particular, the requests for a current copy of my contest logging
>> spreadsheet. My thanks go out to K0MHC and W9FZ for their efforts in
>> getting copies out to people.
>>
>> Thank you also, Jerry, for trying your best to help, but the versions of
>> the logging spreadsheet on my qsl.net web page are no longer the current
>> one. Jim and Bruce connected people with a newer, improved version. I
>> need
>> to replace the obsolete versions of the file, and Jerry's posting will
>> serve as a reminder to me that I need to clean up after myself.
>>
>> Since the submission deadline has already passed, I guess it's too late
>> for
>> me to be of any help for this year. Again, my apologies. I hope everyone
>> who played in the 10 GHz and Up Cumulative Contest this year had a good
>> time and did well. I'd cross my fingers hoping to re-join you folks next
>> year, but unfortunately, I haven't recovered enough strength and
>> coordination in my hands to do that simple thing. So I'll hope for it
>> anyway, without relying on crossed fingers to increase the chance that
>> the
>> wish will come true.
>>
>> 73 de W0JT/5
>> EL09vu (New Braunfels, TX) and EL09ro (San Antonio, TX)
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>
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