I was given a Sinclair Hybrid Ring duplexer which I converted to a Q-circuit BpBr duplexer per the recommendation of VE2BMQ. Below in Italics is the text from a thread on this.
Re: [Repeaters] F 150-4E Duplexer
That is a Hybrid Ring duplexor capable of 250 kHz separation on 2m. It
would be much easier to convert it to the Q-Circuit BpBr configuration.
You don't need the Hybrid ring performance for 600 kHz spacing on 2m.
Do the cans have top loops on a flat welded top or side loops on a spun
can (with a curved top)?.
I had a set like that many years ago that I bought in a fleamarket for
65$. I stripped off all the harness and converted it to the BpBr config
with capacitors. It worked fine and the left over connectors were worth
more than the cans cost me.
Burt VE2BMQ>>>
John Sichert wrote:
>
> Rick, if the duplexer is currently not on 146-147, if will require a new
> harness. The harness is only good for a 2% frequency change. The harness
> has (45) "N" connectors. If it has crimped "tees", you will need to replace
> them with standard ones. The correct cable to use is RG-214. You will also
> need (4) adjustable stubs to ease tuning. The last time I heard, they were
> $64 US each, that was about 10 years ago. Most of the cables are 1/4 & 3/4
> wavelength cables, with the exception of the antenna tee & stub cables. You
> can expect about 110-120 db isolation, with a 1.8 db insertion loss. I
> recabled one about 20 years ago. I got several blisters... A friend checked
> on a price of a harness about 8-10 years ago, it was $600. Then I heard
> later, it was no longer available.
> If I can be of anymore assistance, please let me know.
>
> John
> KA3LAO
> jws@...
>
> > Date: Sat, 29 Jun 2002 11:33:45 -0400
> > From: "Rick - VA3RZS" <va3rzs@...>
> >Subject: help with duplexer
> >
> >Sorry for Posting this to so manny groups
> >
> >I need help with getting a sinclair F 150 4E Duplexer on the air
> >or looking for a dupler for VHF (Rx 147.900 tx 147.300) (repeater is
> >running aprox 20 watts)
> >
> >there is not a lot of money in the kitty so any and all help would be
> >great
> >
> >Thank you for all your help
Steve - N8AR
