[MRCA] PRC-77 Squelch

[B. Smith]

  Might as well put that RT-524 on my same "stupid"  list. It has a MTBF 
of 8 to 10 hours. Wasnt even reliable when it was installed in Comm Hut 
instead of a vehicle.  But add "who needs a FM set that takes two people 
to lift it.
Z

On 4/12/2022 2:34 PM, Tim wrote:
> Hi Breck & Eugene - Interesting on the new gear with noise 
> squelch....I think that the Tone squelch idea was incorporated in 
> military sets due to bad experiences with the PRC-8/9/10 and 
> RT-66/67/68 series sets in the 1950's. Mis-setting or just bumping the 
> variable noise squelch knob resulted in No-Comms.  I think Tone "New" 
> squelch was an attempt to soldier-proof the FM sets in the later 
> VRC-12 /PRC-25/77 series sets.  But at a complexity, planning and 
> training cost!
> Jamming via squelch-cature is effective on minimally experienced 
> troops...The yellow lamp on the RT-524 panels helped, but the Old/New 
> portables were all vulnerable.. Civvy PL did make sense on crowded 
> public service nets with shared channel assignments. (Which came first?)
> Tim
> N6CC
>
> On Tue, Apr 12, 2022 at 10:32 AM W2HX <w2hx at w2hx.com 
> <mailto:w2hx at w2hx.com>> wrote:
>
>     The more modern systems (like modern harris) seem to have settled
>     on noise for receive but continue to send 150 Hz on transmit for
>     backward compatibility.
>
>     73 Eugene W2HX
>
>     Subscribe to my Youtube Channel:
>     https://www.youtube.com/c/w2hx-channel/videos
>     <https://www.youtube.com/c/w2hx-channel/videos>
>
>     *From:* mrca-bounces at mailman.qth.net
>     <mailto:mrca-bounces at mailman.qth.net>
>     <mrca-bounces at mailman.qth.net
>     <mailto:mrca-bounces at mailman.qth.net>> *On Behalf Of *Gene Smar
>     via MRCA
>     *Sent:* Tuesday, April 12, 2022 1:28 PM
>     *To:* smithab11 at comcast.net <mailto:smithab11 at comcast.net>;
>     mrca at mailman.qth.net <mailto:mrca at mailman.qth.net>
>     *Subject:* Re: [MRCA] PRC-77 Squelch
>
>     -----Original Message-----
>     From: B. Smith <smithab11 at comcast.net <mailto:smithab11 at comcast.net>>
>     To: Military Radio Collectors Association <mrca at mailman.qth.net
>     <mailto:mrca at mailman.qth.net>>
>     Sent: Tue, Apr 12, 2022 1:03 pm
>     Subject: [MRCA] PRC-77 Squelch
>
>     (snip)
>
>     <Tone squelch was a stupid, expensive, often dangerous  over
>     engineered  program.
>     Z>
>
>     http://k4che.com/PRC77-Squelch/PRC77-Squelch.htm
>     <http://k4che.com/PRC77-Squelch/PRC77-Squelch.htm>>
>
>     (snip)
>
>     Yeah, just like mandatory CTCSS on our repeaters. Don't get me
>     started!
>
>     73 de
>
>     Gene Smar  AD3F
>
>     ______________________________________________________________
>     MRCA mailing list
>     Home: http://mailman.qth.net/mailman/listinfo/mrca
>     <http://mailman.qth.net/mailman/listinfo/mrca>
>     Help: http://mailman.qth.net/mmfaq.htm
>     <http://mailman.qth.net/mmfaq.htm>
>     Post: mailto:MRCA at mailman.qth.net <mailto:MRCA at mailman.qth.net>
>
>     This list hosted by: http://www.qsl.net <http://www.qsl.net/>
>     Please help support this email list:
>     http://www.qsl.net/donate.html <http://www.qsl.net/donate.html>
>
>     ______________________________________________________________
>     MRCA mailing list
>     Home: http://mailman.qth.net/mailman/listinfo/mrca
>     <http://mailman.qth.net/mailman/listinfo/mrca>
>     Help: http://mailman.qth.net/mmfaq.htm
>     <http://mailman.qth.net/mmfaq.htm>
>     Post: mailto:MRCA at mailman.qth.net <mailto:MRCA at mailman.qth.net>
>
>     This list hosted by: http://www.qsl.net <http://www.qsl.net>
>     Please help support this email list:
>     http://www.qsl.net/donate.html <http://www.qsl.net/donate.html>
>