Thumbs up, not sure if you terminated the antenna port of the duplexer during your testing, but the isolation may improve a little when antenna port is terminated verse left open circuit.
I didn't terminate the antenna port - was just looking at the isolation of the diplexer. I did mess with it off camera, and really didn't see much change at all - very negligible.
Yes you can. I did that in the commercial world. We put 800 MHz Nextel and 1900 MHz Sprint base stations on one coax and then diplexed them out to different antennas.
I have a Comet triplexer. It is connected to a 2m-only radio, 70cm hotspot, and SDR to pick up my county 857MHz P25. The 2m port also passes HF. I am not sure I would want 100W out of the 2m radio. It goes to 65W, but I run it at 25. The hotspot still works!
RIght - I keep the 9700 power low-ish, and it's the only radio on my triplexer. Normally, it's just d-star on a hotspot, and a few random repeaters. I've not used either of my *plexers in a 2 radio situation.
At HF it looks like you have 60db of isolation, given 100W you'd have 0.1mW of HF power on the VHF radio. On VHF you have 45db, given 100W on VHF you'd have 35mW of power on the HF radio. The answer might be as simple as an extra lowpass filter on the HF port to get more VHF rejection. Thanks for the follow up
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Thumbs up, not sure if you terminated the antenna port of the duplexer during your testing, but the isolation may improve a little when antenna port is terminated verse left open circuit.
I didn't terminate the antenna port - was just looking at the isolation of the diplexer. I did mess with it off camera, and really didn't see much change at all - very negligible.
Can you use two diplexers, one on either end of a coax, to put two antennas on a single run of coax?
Are you talking about a 2 port radio to 2 separate antennas?
Yes you can. I did that in the commercial world. We put 800 MHz Nextel and 1900 MHz Sprint base stations on one coax and then diplexed them out to different antennas.
@FEPLabsRadio yup
I have a Comet triplexer. It is connected to a 2m-only radio, 70cm hotspot, and SDR to pick up my county 857MHz P25. The 2m port also passes HF.
I am not sure I would want 100W out of the 2m radio. It goes to 65W, but I run it at 25. The hotspot still works!
RIght - I keep the 9700 power low-ish, and it's the only radio on my triplexer. Normally, it's just d-star on a hotspot, and a few random repeaters. I've not used either of my *plexers in a 2 radio situation.
Oh god! He reads these? What have we done?!?! 😂
:D
At HF it looks like you have 60db of isolation, given 100W you'd have 0.1mW of HF power on the VHF radio.
On VHF you have 45db, given 100W on VHF you'd have 35mW of power on the HF radio. The answer might be as simple as an extra lowpass filter on the HF port to get more VHF rejection.
Thanks for the follow up
"ya'lls comments" He has been assimilated by the bama bug! Thanks for the video Jeem! 73
The industries are rife with mixups.
Doesn't help the I/U keys are right next to each other on a QWERTY keyboard.