RE: [Repeater-Builder] Help with Sinclair Q-202G
At 09:32 PM 02/24/08, you wrote: Collin, Simply replace your existing harness that has 12 center-to-center lengths with an identical harness that has 14 center-to-center lengths. The two end pieces, the ones that connect to the receiver and transmitter, can be any length that fits. Please use RG-214/U double-shielded cable, in lieu of single-shielded RG-213/U cable. You won't regret it! Since you mention eight pieces of coax, I wonder if perhaps you have the earlier version of the Q-202G duplexer. All of the Q-202G duplexers that I have converted had four cavities, and the cable harness comprised five tee connectors and two male N plugs for a total of six pieces of cable. Don't get wrapped up with wavelengths, because Sinclair wasn't that concerned about it; the high-split (150-174 MHz) harness had 12 spacing, and the low-split (138-150 MHz) harness had 14 spacing. 73, Eric Lemmon WB6FLY And a fast test is to add a right angle adapter to each end of the existing cable pieces. The average right angle adapter adds about an inch, so adding one to each end will lengthen the cable to 14 inches, plus or minus... Now, I wouldn't use adapters for a long term solution, but it works for testing. Mike WA6ILQ
Re: [Repeater-Builder] Help with Sinclair Q-202G
Collin, it depends on what vintage Q-202G you have. I have four duplexers that have the rexolite rod caps to adjust the notch frequency on each cavity, and I brought them down into the ham band by increasing the length of the jumper cable that connects directly to the cavity from 10.5 inches to 12.5 inches. I also came up with a manual and Eric Lemmon scanned it into a PDF file and posted the manual on the repeater-builder site. http://www.repeater-builder.com/sinclair/q202-208-218-tuning.pdf The manual explains how to tune the duplexer to a new frequency. What you have to keep in mind is that the first piece of cable connecting to each cavity is part of the notch circuit and that piece of cable in conjunction with the variable setting of the dialectric rod determines the frequency of the notch. Also keep in mind that this circuit produces a notch above and below the center frequency the cavity is tuned to, and the high and low sides of the duplexer have identical circuitry. 73 - Jim W5ZIT [EMAIL PROTECTED] wrote: Dear Friends, I am working on retuning a Sinclair Q-202G duplexer to 144.810/145.410. The question I have is about the new cables I will need. First will I need all new cables? What I mean is there are actually eight pieces in all. These need to be 1/4 wave each? Also when measuring these I know the measurement is from the center of the T connector. When measuring to a connection on a stub where is the measurement taken from? I have some RG-213 cables which measure 12 from T center to T center. Anyone that can help would be greatly appreciated. Thanks, Collin - Never miss a thing. Make Yahoo your homepage.
Re: [Repeater-Builder] Help with Sinclair Q-202G
At 04:38 PM 2/24/2008, you wrote: Dear Friends, I am working on retuning a Sinclair Q-202G duplexer to 144.810/145.410. The question I have is about the new cables I will need. First will I need all new cables? ---It depends on where the duplexer was originally. I run a Q-202G (six cavity) and didn't need to replace a thing when it was retuned down from the 150 region Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em!
Re: [Repeater-Builder] Help with Sinclair Q-202G
The cavities will probably go, the harness may not. What is the frequency on the label ? Unless someone has replaced the harness that is a good indicator as to which one you have (there were two). Mike WA6ILQ At 04:38 PM 02/24/08, you wrote: Dear Friends, I am working on retuning a Sinclair Q-202G duplexer to 144.810/145.410. The question I have is about the new cables I will need. First will I need all new cables? What I mean is there are actually eight pieces in all. These need to be 1/4 wave each? Also when measuring these I know the measurement is from the center of the T connector. When measuring to a connection on a stub where is the measurement taken from? I have some RG-213 cables which measure 12 from T center to T center. Anyone that can help would be greatly appreciated. Thanks, Collin More new features than ever. Check out the new AOL Mail ! - http://webmail.aol.com Yahoo! Groups Links
RE: [Repeater-Builder] Help with Sinclair Q-202G
Collin, Simply replace your existing harness that has 12 center-to-center lengths with an identical harness that has 14 center-to-center lengths. The two end pieces, the ones that connect to the receiver and transmitter, can be any length that fits. Please use RG-214/U double-shielded cable, in lieu of single-shielded RG-213/U cable. You won't regret it! Since you mention eight pieces of coax, I wonder if perhaps you have the earlier version of the Q-202G duplexer. All of the Q-202G duplexers that I have converted had four cavities, and the cable harness comprised five tee connectors and two male N plugs for a total of six pieces of cable. Don't get wrapped up with wavelengths, because Sinclair wasn't that concerned about it; the high-split (150-174 MHz) harness had 12 spacing, and the low-split (138-150 MHz) harness had 14 spacing. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, February 24, 2008 4:39 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Help with Sinclair Q-202G Dear Friends, I am working on retuning a Sinclair Q-202G duplexer to 144.810/145.410. The question I have is about the new cables I will need. First will I need all new cables? What I mean is there are actually eight pieces in all. These need to be 1/4 wave each? Also when measuring these I know the measurement is from the center of the T connector. When measuring to a connection on a stub where is the measurement taken from? I have some RG-213 cables which measure 12 from T center to T center. Anyone that can help would be greatly appreciated. Thanks, Collin
