[MRCA] 75-Meter Crystal Control

[Radio Station KW1I]

Good suggestion Al.  I don't mind re-crystalling my rigs as long as I have 
awhile to plan for it.  Let's listen to the frequencies you suggest for a 
time and see if we can develop a consensus on which one might be best.  We 
should consult the latest ARRL list of net frequencies as well.

I think 40 and 60 meters may be our tactical ops future.  We should be 
thinking a couple of frequencies on each of those bands as well.

Dale
KW1I

----- Original Message ----- 
From: "Al Klase" <al at ar88.net>
To: "Military Radio Collectors Association" <mrca at mailman.qth.net>
Sent: Sunday, September 23, 2007 4:18 PM
Subject: [MRCA] 75-Meter Crystal Control


> Guys,
>
> Operations at the recent meet, once again, pointed out the problems
> associated with using 3885 for our purposes.  This is, after all, the AM
> calling frequency, and most of the Yaaa-Em gang hangs out here on a
> daily basis.  Also for reasons not clear to me, a lot of sidebanders
> insist on crowding this frequency range as well.
>
> 3885 seems to have been chosen because it was one of the popular BC-611
> frequencies with the military, so many of these rigs were crystaled for
> 3885 from the git-go, and there were lots of surplus crystals to support
> general-class hams in the AM hay day and beyond.
>
> 3885 works just fine for the OMRN at zero-five-thirty, and for local
> operation out to a few hundred yards where we can "work under" the other
> QSO's.
>
> It seems to me that we should move to either the recently rearranged
> Extra or Advanced phone bands, 3600-3699 or 3700-3799 respectively.
> I've been sitting here with a 16KHz-wide receiver on 3680 all Sunday
> afternoon, and heard nothing except a distant electric fence.
>
> So we need to discuss this:
>
> How many of us are not Extra or Advanced class amateurs?  It seems to me
> we could, if nothing else, send an Extra with each team, use his call,
> and be completely legit.
>
> This would have little impact on the frequency-agile rigs.  All we have
> to do is pick a frequency of the day and try it.  It's the
> crystal-controlled rigs that present the problem.  Just as a standard
> BC-611 frequency established the calling frequency, I'm leaning toward
> other BC-611 freq's:
>
> 3640 (4095 RX xtal)   Extra
> 3680 (4135)               Extra
> 3720 (4175)               Advanced
> 3760 (4215)               Advanced
>
> There are 3720's our junkboxes because that was a novice frequency in
> "the day."  3686.4 is a standard microprocessor clock frequency.  We can
> buy HC-49's form Mouser for 45 cent, quantity one.  FT-243's can be
> moved up in frequency maybe 50-100 KHz with wet-or-dry sandpaper and a
> little patience.  If we ever agree on a frequency, we could custom order
> some plated hermetically-sealed rocks at a reasonable rate if the
> quantities are appropriate.
>
> Does anyone know the distribution of amateur classes across the entire
> ham community?  I suspect the ertra bands are considerably under
> utilized compared to the general portions.
>
> What do y'all think?
>
> Al
>
> -- 
> Al Klase - N3FRQ
> Flemington, NJ
> http://www.skywaves.ar88.net/
>
>
>


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