[Milsurplus] [ARC5] SCR-287 (BC-375 & BC-348) WW II Operational Question

[boeing377 at gmail.com]

That 1.6 mW backwave copy is very impressive.

I had a 10 M WSPR balloon that also had a CW beacon. 13 mW. Got a few
thousand mile CW spots. 46,000 ft float altitude. Stayed up 110 days.
Multiple trips around the world.

Have a WSPR balloon aloft now on its 6th orbit. Been up since June 14.

https://wsprtv.com/?cs=AF6IM&ch=326&band=10m&start_date=2025-06-13

Mark
AF6IM







On Fri, Oct 3, 2025 at 10:25 PM Dennis Monticelli <
dennis.monticelli at gmail.com> wrote:

> I have a regular 80M morning sked with a friend in the Sierra Nevada
> mountains.  I am located in the San Francisco Bay area.  My rig is a CMS
> suitcase spy set.  It puts out about 5 watts and because the osc runs
> continuously during TX, a backwave as well.  I measured the backwave at
> 1.6mW.  My friend can often copy the backwave.  Distance about 200 mi.
> Full size dipoles at both ends.  Under the right conditions, it doesn't
> take much.
>
> Dennis AE6C
>
>
>
> On Fri, Oct 3, 2025 at 8:23 PM Hubert Miller <kargo_cult at msn.com> wrote:
>
>>
>>
>>
>>
>> Sent from my Galaxy
>>
>>
>> -------- Original message --------
>> From: Bill Cromwell
>> Date: 10/3/25 15:39 (GMT-08:00)
>> To: Hubert Miller
>>
>> >Once upon a time when I was active the Navy-Marine Corps MARS system one
>> of our members used an LM or 221 (don't remember which) as  CW transmitter
>> by keying the antenna feed line. It was not the very best of armchair copy
>> but the people he needed to contact heard him with no fills. I was logged
>> into that net session and heard him well enough to copy. We were all in the
>> state of Michigan and not hundreds or thousands of miles apart and the
>> frequency was just above 4 MC.
>> Bill  KU8H
>> >Michigan QRP Club  M-1778
>>
>> Bill, how did that fellow match the presumably low Z antenna to the high
>> Z connection on the freq meter ?
>> "QRPP ! "
>> -Hue Miller
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