Glenn, Yeah, I wonder about what's in the box too, but I suspect it's simply a place to solder the three center conductors together, and the impedance bump is ignored.
So, what you need seems to be a TLE5772A "Yellow" tee cable assembly. Wouldn't it be great if someone who has that cable could make exact measurements of it, just as Charlie KC5OZH did for the TLE5732A "Green" cable? I'd rather not make up such a cable harness with an N tee and N connectors attaching to it, but I might not have a choice- and it should work. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Glenn Shaw Sent: Monday, December 31, 2007 1:08 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] MSF5000 TEE Cable Hi Eric I agree on the tee connection in the center being the tricky part. I wonder also if there is anything else that Moto has put into that small box in the middle of the tee. Or could a person just use a regular tee connector and then make up 3 jumpers with connectors on each end and just connect up to the tee. Problem is that after you get done buying all the connectors and the tee to make one yourself, especially if they were type N, you would be at least halfway towards just picking up a new one. I have not seen these in VHF, since the only MSF5000 stations that were able to use a completely internal "duplexer setup" were the UHF ones that used the high selectivity optional front end receiver filtering combined with the 3 section prefilter and then the 4 section post filter on the transmit amp, all feeding into the special tuned TEE cable. It all seems sort of a kluge but it does work and you can run the repeater off a single antenna without an external standard duplexer. They claim about 75-80 dB isol at 5 MHz separation if tuned right. It has been mentioned that some people have had problems with the system with desense and there are others that have had it work great. I had anolder analog MSF5000 running with Xmt lower than Rcv that worked super with no desense. This is my first attempt at a Xmt higher than Rcv MSF so we'll see if I can get it to tune, otherwise it will be falling back to plan B and use a regular 4 cav Pass Reject duplexer and be done with it. 73 Glenn N1GBY -----Original Message----- From: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> [mailto:Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Eric Lemmon Sent: Monday, December 31, 2007 2:27 PM To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> Subject: RE: [Repeater-Builder] MSF5000 TEE Cable Glenn, I perused the MSF5000 section on the RBTIP and found a sheet titled "Combining Tee Duplexer" which addresses only the UHF tee cables. I suppose there is another sheet somewhere that documents the VHF tee cables. The above sheet states that the TX leg on a TX-below-RX cable should be about 1/4 wavelength, and the RX leg should be about 5/4 wavelength. However, the dimensions shown for a green tee cable on a file recently uploaded by KC5OZH, do not agree with the above statement. It appears that Charlie's drawing is of a TLE5732A cable. One-quarter wavelength is about 17 cm at 435 MHz, and about 16 cm at 475 MHz. Likewise, 5/4 wavelength is about 86 cm at 435 MHz, and about 79 cm at 475 MHz. Based upon Charlie's measurements, it would seem that the formulas given in the Combining Tee Duplexer sheet are incorrect. I believe that fabrication of the tee cables with RG-400 coaxial cable and readily-available crimp connectors is a simple task. What may be a challenge is making the tee junction without a significant impedance bump. I'd prefer to use a constant-impedance tee, but such an animal may not be available in a three-way (cable-cable-cable) configuration. 73, Eric Lemmon WB6FLY
