Gary,
A return loss bridge (RLB) is an extremely useful tool for tuning the
pass function of a BpBr duplexer. That's because the bandpass response
of each cavity in a BpBr duplexer is very subtle- nothing like the peak
you will see in a bandpass-only cavity. Even when three BpBr cavities
Lemmon
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, December 21, 2005 9:42
AM
Subject: Re: [Repeater-Builder] Duplexer
tuning with Return Loss Bridge
Gary,A return loss bridge (RLB) is an extremely useful
tool for tuning the pass function of a BpBr duplexer. That's
Who makes a Return Loss Bridge? Any idea of the approximate cost?
LJ
-Original Message-
From: Eric Lemmon [EMAIL PROTECTED]
Sent: Dec 21, 2005 7:42 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexer tuning with Return Loss Bridge
Gary,
A return loss bridge
The Bird Model 43 is a typical RLB. You can also use a network analyzer.
Dick
- Original Message -
From: [EMAIL PROTECTED] [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: 21 December, 2005 08:20
Subject: Re: [Repeater-Builder] Duplexer tuning with Return Loss Bridge
Who
December, 2005 08:46
Subject: RE: [Repeater-Builder] Duplexer tuning with Return Loss Bridge
The Bird Model 43 is a typical RLB.
Oh really???!??!?
The Eagle return loss bridges are a good value for the buck.
www.eagle-1st.com. They have a whitepaper on tuning duplexers too.
http://www.eagle
At 12/21/2005 01:28 AM, you wrote:
I just tuned a set of 641's with my IFR1500, a couple of 3dB pads, and a
dummy load for the unused port while tuning it up. That's all you should
need to get them tuned. You can also use the RL bridge to optimize the 50
ohm match. See this article:
Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Dick
Sent: Wednesday, December 21, 2005 12:01 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexer tuning with Return
Loss Bridge
Yes, really. You measure the forward power
, 2005 09:26
Subject: RE: [Repeater-Builder] Duplexer tuning with Return Loss Bridge
The Bird is a directional wattmeter. It's not a return loss bridge (it's
not a bridge at all). Yes, you can compute a spot-frequency measurement of
return loss that way, that doesn't help you with swept-frequency
-
From: Eric Lemmon [EMAIL PROTECTED]
Sent: Dec 21, 2005 7:42 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexer tuning with Return Loss Bridge
Gary,
A return loss bridge (RLB) is an extremely useful tool for tuning the
pass function of a BpBr duplexer. That's
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