Questions tagged [duplexer]
The duplexer tag has no usage guidance.
8
questions
1
vote
2answers
58 views
Is power output or something else to blame for my duplexer failing?
A Ham buddy of mine and I were trying to setup a UHF repeater in our area due to a lack of them. We had two Motorola CDMs, one a 1250 and one a 1550, and we purchased a $200 or so reject only duplexer ...
1
vote
0answers
52 views
Repeater transmit voice message/warning on input frequency?
I'm in the process of planning a UHF CB radio repeater. And I've heard there are ones around that transmit a voice message/warning on their input frequency (as well as standard output channel ident) ...
3
votes
2answers
136 views
Why do repeater duplexers have notch cavities between transmitter and antenna?
Why are notch filters used on the transmit side of a repeater duplexer?
The primary purpose of a duplexer is to keep the transmitter output out of the receiver input, since they both operate at the ...
9
votes
3answers
963 views
Why is my diplexer such a spectacular failure?
I'm trying to create a diplexer for the 2m and 70cm bands so that two antennas can share a feedline to my "shack". My radio is a Yaesu FT60 handheld, 5W max.
I have home made a j-pole for 2m, and a ...
6
votes
2answers
784 views
Looking for a schematic of a DIY circulator
I would like to build a simple HF, VHF or UHF circulator to get a better understanding of how these devices work. Sadly at the moment I'm unaware of any articles or books that provide corresponding ...
1
vote
1answer
225 views
Retuning 2m Duplexers (Q2330E) with Spectrum Analyzer and Tracking Generator
Yesterday I was trying to tune up the duplexers one can at a time as listed in this Sinclair Youtube Video.
After tuning them my receive is awful and my transmit is somewhat not what it used to be. ...
3
votes
1answer
367 views
Using a Duplexer and Diplexer in Series
I have 3 Motorola CDM750s that I’m using to build a multi-purpose, portable, temporary repeater. There are 1 VHF and 2 UHF radios. I want to be able to use it as either an in-band UHF repeater or as ...
1
vote
1answer
109 views
Frequency Agile Duplexer
Duplexers are very annoying, you have to go up to the site with your service monitor and tune it up just to switch the frequency that it operates at. They are a pain to tune, and are designed to stay ...
