I ordered the Jiesai Duplexer Model SGQ-450 as a backup for my Motorola T-1504A duplexer. I was quite impressed with the performance for the price. I purchased it on Ebay for $100.50. The seller tuned the duplexer to the frequencies that I requested.
The Jiesai duplexer is a six cavity design rated to handle up to 50 watts. It has a frequency range of 380-485 MHz and a bandwidth of ±500kHz. The insertion loss is equal to, or less than 1.0dB, and a VSWR of equal to, or less than 1.5:1. It comes with “N” connectors which is great considering that SO-239 connectors are horrible for UHF.
This is a great duplexer to start out with for your UHF repeater. But, I would not recommend this duplexer for a VHF repeater. The Jiesai Duplexer SGQ-450 cannot achieve the separation necessary for a standard US offset +600 kHz or -600 kHz.
You can find the Jiesai Duplexer on eBay.
Thanks for your honest review on the UHF duplexer. It appears you posted this in 2015, and its 3 years later. I was wondering if the unit is still working as it was at first (I’m concerned about the inner plating flaking off). Have you noticed any issues? Thanks again. KO4L Lloyd
I only used the Jiesai duplexer for a few months while my Motorola duplexer was getting tuned. I plan on using it again for mobile repeater system, but again, it will only be in use for a few days at a time. Sorry I could not give you a better answer.
Can you tell me what type of duplexer this is (Notch, Band pass, etc.) I am new to this and trying to understand.
Thanks in advance, W5WEO Walter
It is a notch (Band Reject) duplexer that is fairly decent for the price. I have not had any issues with it to date. You can read more about notch duplexers here – http://www.repeater-builder.com/antenna/notch-duplexer-tuning.html
I’ve just come across this as I’m in dire need for one here in the UK for a project on a temp basis and looking for a 5.5mhz split on this – Would it be capable of handling this?
We would really appreciate a response as all suppliers are out of these in Europe currently (usually use procom)