Sounds like your forcing that duplexer outside it's parameter.
Millin
toggle quoted message
Show quoted text
----- Original Message -----
From: Jared Smudde <computerwhiz02@...>
To:
[email protected]Sent: Tue, 01 Nov 2022 16:55:15 -0600 (MDT)
Subject: Re: [repeater-builder] VHF MTR2000 Poor Receive Performance
So the transmit side cavities all have 29db-32db of return loss at pass frequency, 30db of notch rejection and 0.4db of IL at the pass frequencies.
I went to the receive cavity causing trouble and slid the tuning rod all the way up and cleaned the rod with some fine sandpaper and wiped it down with denatured alcohol. I then took the rod and ran it up and down the cavity several times all while rotating the rod at the same time. I was able to get the return loss to 30DB on the cavity. Probably had to clean some varnish off of the rod and tuning fingers.
I reattached the harness and each side had about 1.67db of insertion loss and I was able to get the notch over 105db on each side.
I hooked up the repeater and was met with disappointment, repeater is still deaf with no improvement.
