VHF duplexers

[arlojanis]

I need a VHF, 100 watt, 600 khz, pass-reject duplexer. Which is best, Comprod or Telewave? Which is best, round or square cavities?

[RFguy]

Sinclair is my choice for reliability, particularly over temperature extremes.

Round is always "best" if "best" is performance. Better, sharper Q. If "best" is size/cost at the expense of performance, then look at square.

[d119]

I've had wonderful experience with Telewave products.

I've had wonderful experience with Sinclair products.

I've never worked with ComProd stuff.

[escomm]

Seconding Telewave. Sinclair is overpriced and takes too long to get. Also worth looking at EMR. Comprod is OK too. Might could give a look at TXRX

[tvsjr]

I've been very pleased with EMR. They jumped through their ass to get me an isoplexer (duplexer plus dual isolator) when we had a critical fire repeater down. Didn't even charge me a rush fee. And the finished product was actually quite a bit better (less insertion loss and better rejection) than spec.

Heard good things about Comprod as well.

Honestly, I don't think you would go wrong with any of the companies mentioned herein. It comes down to price, support, and availability.

[d119]

EMR is good stuff. If you are going to consider them, call them and speak with Alan Leffler. He's a great guy and will help you out! He's also a ham.

[motorola_otaku]

I help maintain two 2-meter repeaters running on Telewave duplexers. Easy to maintain and a cinch to retune. They do offer a ham discount, 5% iirc.

I've also worked with EMR for custom filters and, as tvsjr said, their customer service is above excellent. If you ever need a non-standard RF filter product they are the guys to go to.