[MRCA] PRC-77 Squelch

[Tim]

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> 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
>
>
>
>
>
>
>
> *From:* mrca-bounces at mailman.qth.net <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; mrca at mailman.qth.net
> *Subject:* Re: [MRCA] PRC-77 Squelch
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: B. Smith <smithab11 at comcast.net>
> To: Military Radio Collectors Association <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>
>
> (snip)
>
>
>
> Yeah, just like mandatory CTCSS on our repeaters.  Don't get me started!
>
>
>
> 73 de
>
> Gene Smar  AD3F
>
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