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cusackmusic wrote:I have a VHF Celwave 636 series VHF duplexer. I haven't tuned a duplexer since 1994, so I'm a little rusty. Anyway, I put my IFR1200 on "tracking med", and tuned it to the lowest notch at the opposite frequencies. When I get done, I have a few issues/questions:
1. The TX radio now has a sensitivity of 2KuV. If I "fine tune" it by transmitting the RX frequency into it from the common port, and tweak it to lower sensitivity, I can get it to barely RX at all. But when I go back to the duplex mode on the IFR, the notch os nowhere near what it was. I recall tweaking them in like this back in the day, but I don't recall the notch coming up. What am I doing wrong (or right)?
2. The TX power is attenuated by A LOT. 20W in, 12W out.
3. What is the difference between tracking low, trakcing med, and tracking high on my IFR? I have a service manual, but can't seem to find an operation manual on the thing. It appears that I can fine tune better in tracking high?
tvsjr wrote:Generate into the TX port and receive on the antenna port (terminate the unused port with a 50ohm load).
jackhackett wrote:tvsjr wrote:Generate into the TX port and receive on the antenna port (terminate the unused port with a 50ohm load).
I generate into the the antenna port, guess it's six of one.....
Jay wrote:Enjoying this discussion...I've bought some cables recently for stuff like this from:
Not to hijack the thread, but where can I get pads?
cusackmusic wrote:OK, Repeater has been installed almost a month now, and seems to be working well. After re-tweaking the duplexer, I get no distinguishable desense of the RX. I wish I had better RX though. In basements downtown, I can hear the repeater, but the RX (of the repeater) is so scratchy, that I'm not being heard.
Thanks to those of you that had constructive things to say, it's was very helpful!
Next project, re-program our pagers with the repeater as a backup paging system. I have to figure out how to make the pagers scan without missing pages. I know this can be tricky, so I'll have to do some more research before I implement this...
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