[MRCA] 10-Meter FM

[Gene Smar]

Al et al:

     Before we jump into 10 FM using milrads, remember:  these old green 
radios are wideband FM.  That modulation is not permitted on Ham freqs below 
30 MHz.  We can get away with it on 6M and above.  I'll check the FCC Rules 
over the weekend (it's nearly 12M here now.)  But IIRC, the Rules section on 
permitted modulation describes the math used to determine index of 
modulation or some such thing which must be less than 1 below 30 MHz.

     Stay tuned.


73 de
Gene Smar  AD3F


----- Original Message ----- 
From: "Al Klase" <al at ar88.net>
To: "Military Radio Collectors Association" <mrca at mailman.qth.net>
Sent: Thursday, December 16, 2010 8:33 PM
Subject: [MRCA] 10-Meter FM


> The recently released MRCG (West Coast MRCA) field day video sparked a
> 10-meter FM discussion on today's C/LRRP Net.
> http://www.youtube.com/watch?v=aUKl9BdsvUc
>
> So, we'll try to support such operation at future MRCA gatherings.
> We're talking the "armor" frequency range 27.0 to 38.9 MHz.
>
> Candidate Radios:
>
> SCR-608/628:         BC-683, BC-684 (Tank Sets)
> SCR-609/610:         BC-659 (Jeep Sets)
> SCR-619:                BC-1335
> PRC-9
>
> OK, what did I miss?
>
> Frequencies:
>
> The standard mil channels were at 100 KHz intervals.  29.6 seems to be
> the "official" FM calling freq.
> I think we're loing at 29.1, 29.2, 29.3, 29.4, 29.5, and 29.6.  We
> probably should zero in on one or two.
>
> Crystals:
>
> Tank Sets:  FT-241 Channel 291, 292, 293, 294, 295, and 296 TX, RX is
> not crystal controlled.
>         Divide frequency by 72 for actual xtal freq.
>
> Jeep Sets:  FT-243 (One crystal only for TX/RX.)
> Channel 291 - 6200 KHz
> Channel 292 - 6225 KHz
> Channel 293 - 6250 KHz
> Channel 294 - 6275 KHz
> Channel 295 - 6300 KHz
> Channel 296 - 6325 KHz
>
> So, who's this crazy?
>
> Al
>
>
>
>
> -- 
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
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