Sierra Echo PMR Repeater Group

Licence free two-way radio services that now includes both FM and digital channels. Discuss models, modifications and other similar worldwide standards such as FRS and GMRS.
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MikeSE9
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Sierra Echo PMR Repeater Group

Post by MikeSE9 » 09 Sep 2016, 12:31

Hi, some of you in the South east might be interested in this

https://www.facebook.com/Sierra-Echo-PM ... 0/?fref=ts

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Re: Sierra Echo PMR Repeater Group

Post by M3VBS » 09 Sep 2016, 18:31

Interesting thanks. Don't do facebook so I can't see behind the initial page - any idea if ctcss is used and what tone

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Re: Sierra Echo PMR Repeater Group

Post by paulears » 09 Sep 2016, 22:01

I don't get it at all - it doesn't run much power, so unless it's perched on the top of a mountain or hanging from a balloon - does it do very much? The frequencies are so close that desense means big and heavy cavities, or aerial spaced a very long way apart - have I totally missed the point? Probably, knowing me!

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Re: Sierra Echo PMR Repeater Group

Post by radiosification » 16 Sep 2016, 15:56

Interesting. They're also using 446.9875mhz as the repeater's RX channel so you'll need a huge antenna and your transmissions might go all the way around the world because it's such a low frequency. Don't know why they didn't choose a frequency in the UHF band or maybe on the VHF band would have been better then they could have had a crossband repeater.
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Re: Sierra Echo PMR Repeater Group

Post by paulears » 16 Sep 2016, 16:54

Eh? 446.9875MHz is UHF - confused.

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Re: Sierra Echo PMR Repeater Group

Post by mercury888 » 16 Sep 2016, 17:43

paulears wrote:Eh? 446.9875MHz is UHF - confused.
Indeed, but they quote mhz, milli-hertz! With a small 'h' at that!
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Re: Sierra Echo PMR Repeater Group

Post by paulears » 16 Sep 2016, 18:02

Aha! A joke. I get it! Wish I didn't now.

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Re: Sierra Echo PMR Repeater Group

Post by Admiral » 20 Sep 2016, 19:37

More power to your elbow mate, but I think you guys will be making yourself a sitting duck if someone get's the hump.
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Re: Sierra Echo PMR Repeater Group

Post by bigbloke » 21 Sep 2016, 08:19

I notice their FB page says 446.9875 is an old SRBR channel......it isnt !

hope they're not near the coast as its rather close to a navy POLYCON frequency!

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Re: Sierra Echo PMR Repeater Group

Post by Admiral » 01 Oct 2016, 10:52

I notice their FB page has no updates for 6 weeks.
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Re: Sierra Echo PMR Repeater Group

Post by MikeSE9 » 01 Oct 2016, 17:17

What are the chances of a 0.89375MHz split working with out cavities, or a big separation between antennas on Baofeng Radios?

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Re: Sierra Echo PMR Repeater Group

Post by Admiral » 01 Oct 2016, 18:08

MikeSE9 wrote:What are the chances of a 0.89375MHz split working with out cavities, or a big separation between antennas on Baofeng Radios?
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Re: Sierra Echo PMR Repeater Group

Post by AlfieDivine1 » 10 Dec 2017, 10:48

Calling PMR CH 8 each Sunday & Mondays throughout the day,
located in folkestone South East England.

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Re: Sierra Echo PMR Repeater Group

Post by Steve B » 10 Jan 2018, 19:39

MikeSE9 wrote:
01 Oct 2016, 17:17
What are the chances of a 0.89375MHz split working with out cavities, or a big separation between antennas on Baofeng Radios?
is that the terminology? cavities? referring to how the TX output signal of the repeater messes up with the AGC of the reciever?
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Re: Sierra Echo PMR Repeater Group

Post by Freddie » 11 Jan 2018, 16:23

No ;)

Most repeater systems use a duplexer to allow TX and RX to share an antenna without interfering. I'll leave it for someone cleverer than me to describe the physics of HOW they work, but they use a series of metal "cans" or cavities to do what they do.

The phenomenon you describe (which cavities or other filtering will hopefully minimise) is just called de-sensing I believe.

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