Re: [Repeater-Builder] Squelch action on 10 m FM

[Paul Plack]

John, how's this for an experiment...

Configure a repeater with two receivers, one built for +/- 5 kHz deviation, the 
other for +/- 15, feed them from a splitter, use audio from the narrow one, but 
allow a DTMF command to select the wider receiver's COS when conditions 
warrant. (Obviously, those conditions would have to include no adjacent channel 
signal...)

Or, four receivers...I've always wanted to play with H/V polarization diversity 
when the band was up!

;^)

73,
Paul, AE4KR

  - Original Message - 
  From: John Sehring 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Thursday, August 20, 2009 4:36 PM
  Subject: [Repeater-Builder] Squelch action on 10 m FM



  BTW, the less the deviation, the harder it is to design reliable squelch 
circuits.  It was easier in the +-15 kHz deviation daze.  The supersonic audio 
spectrum will be different for other tx deviation/rx IF bandwidth situations...
  . 

  

Re: [Repeater-Builder] Squelch action on 10 m FM

[no6b]

At 8/20/2009 23:17, you wrote:


John, how's this for an experiment...

Configure a repeater with two receivers, one built for +/- 5 kHz 
deviation, the other for +/- 15, feed them from a splitter, use audio from 
the narrow one, but allow a DTMF command to select the wider receiver's 
COS when conditions warrant. (Obviously, those conditions would have to 
include no adjacent channel signal...)

If noise squelch is so problematic in severe multipath conditions, why not 
do away with it entirely  use straight CTCSS squelch?  The GE decoders 
that use Versatone chips are fast enough that you can still almost 
eliminate the squelch tail with an ADM.

Bob NO6B