[MRCA] VHF Low Band Listening

[Steven Daniel Miller]

The PRC-77 manual indicates normal voice bandwidth up to 3KHz and
Encrypted up to 20KHz spectrum.  Don't know what the actual transmitted
bandwith on full key-up is but it's at least 20KHz for encryption.

Well, I'm heading to the relatively big Iola military vehicle/collectors
show in Iola, WI in two weeks.  Maybe someone will be active on 51MHz at
that time.

Just need to find a good PRC-104 now.

Thanks,

Steve

On Mon, 31 Jul 2006 WA5CAB at cs.com wrote:

> Don't forget also that the definition of Wide Band or Narrow Band depends on
> who's talking about it.  The WW-II and Korean War vintage military sets, plus
> the early AN/PRC-25 and AN/VRC-12 variants have deviations in the +/-15 KC
> range or maybe a little wider.  On the ham bands below 29.0 MC, FM sets are
> limited to theoretically the same bandwidth as DSB AM is, which is legally ~ 6 KC
> total.  So the early military sets are Wide Band in this sense, and the
> commercial ham band sets are Narrow Band.  But the later military sets from I think
> AN/PRC-25B on are something like +/- 100 KC deviation for use with voice
> security equipment such as the TSEC/KY-8.  I haven't played with any of this
> equipment since I came home from an all expenses paid ocean cruise in 1968 but I
> think I recall that the RT-524/VRC had a selector switch for either Wide Band or
> Really Wide Band.  But not the PRC-25 or PRC-77.
>
> In a message dated 7/31/2006 10:05:15 AM Central Daylight Time, al at ar88.net
> writes:
> > Hi Steve,
> >
> > There's not a lot of excitement here in New Jersey.  One hardly hears
> > any 6-meter activity, and I'd expect most of the DX would be SSB.
> > There's still some police/fire operations on the 30-50 portion.  I can
> > hear a six meter repeater, but the PRC-77 has no way to split the TX/RX
> > freq's.  50KHz channel spacing and wide deviation is also a nuisance in
> > ham terms.  Best bet is to show up for military radio activities.
> >
> > Regards,
> > Al
> >
> > Steven Daniel Miller wrote:
> >
> > >I'm new to the list and new to military radios but I have a PRC-77 being
> > >shipped to me as we speak and I'm really looking forward to getting it.
> > >I'm slightly more interesting in collecting military items than actually
> > >using it but I'm sure I'll do some monitoring.
> > >
> > >I was just wondering if anyone could relay their experiences of monitoring
> > >in the 30-70 MHz area.  I remember in 1988 as we were entering the peak of
> > >the solar cycle.  My dad was in the national guard in Wisconsin and they
> > >have a vehicle with a working radio.  I spent about 2 hours in there
> > >listening (just before I got my amateur radio license).  I remember
> > >hearing things like taxis and some Spanish language stuff coming in
> > >somewhere betweeen 30-50MHz.  Is that stuff still out there or am I going
> > >to be listening to a lot of static on the PRC-77?
> > >
>
> Robert Downs - Houston
> <http://www.wa5cab.com> (Web Store)
> MVPA 9480
> <wa5cab at cs.com> (Primary email)
> <wa5cab at houston.rr.com> (Backup email)
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