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[aprssig] Duplexer or Diplexer

Dave Baxter dave at emv.co.uk
Mon Sep 5 14:04:56 UTC 2005

Have to think about this.  It's the send and receive on the same (VHF)
band of course that it the fun bit.  Unless you have some cavity filters
like the voice repeaters use, it would get "interesting" to say the
Dave B.  G0WBX.


	From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Keith Kotch
	Sent: Monday, September 05, 2005 3:00 PM
	To: 'TAPR APRS Mailing List'
	Subject: [aprssig] Duplexer or Diplexer

	I'm posting this question here because it pertains to being
about to run completely separate APRS system and voice radio.


	Scenario:  Dual-band mobile and separate 2m mobile with tnc.  


	Can a duplexer/diplexer be built (or is one available) that
would allow both radio systems to be hooked up to one dual-band antenna?
The dual-band radios with one antenna lead has a built-in duplexer.  Is
that where the problem would occur trying to coordinate another


	What I'd like to be able to do is run the dual-band for voice,
most likely in cross-band repeat mode on occasion, while being able to
run the APRS/packet radio at the same time being able to receive on
VHF/UHF and VHF packet at the same time.


	I don't know if it's truly a duplexer/diplexer needed or some
way to prevent other radios from getting fried during transmit of one.


	Keith, KF4BXT

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