Jim Gilchrist Posted January 4, 2010 Report Share Posted January 4, 2010 Most likely if they were from BYU in Utah. Eric Bought a bunch myself. Some had never been used. Best regards, Jim Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted January 5, 2010 Report Share Posted January 5, 2010 I bought several of the 72 receivers, did a bit of work on 'em to standardize the headphone jacks and levels, then found a supply of used crystals at a fair price -- all in all, an embarrassment of Comtek riches. If someone shows up at the cart complaining that their Comtek's not working, I'd rather be able to just swap it for another one as opposed to trouble shooting on the spot. It's probably a battery or operator error but, in either case, just handing them another is the best way to deal with it. Having plenty of extras eases my mind. My max in the past was about sixteen, but now I have lots of spares and can also keep some crystaled with alternate frequencies for ear prompters or for sending time code. John B. Quote Link to comment Share on other sites More sharing options...
Zack Posted January 5, 2010 Report Share Posted January 5, 2010 Just scored a good price on another transmitter with 3 receivers today! I got a hold of Comtek today and asked them about the set I recently received (one in the picture earlier). They said I got a really early serial for a rare set with a freq of 72.025 Mhz, NB(narrow band). These receivers can use the letter crystals as well he said, so I'm happy that I have more options now. Quote Link to comment Share on other sites More sharing options...
johnpaul215 Posted March 3, 2011 Report Share Posted March 3, 2011 Anyone know of a good alternative to the stock M72 antenna? Using it for bag work is kind of a pain. Anyone try just making their own whip on a BNC connection? Quote Link to comment Share on other sites More sharing options...
Derek H Posted March 3, 2011 Report Share Posted March 3, 2011 John paul, I assume you mean it's a pain in the bag (ha) because of the length of the antenna. When you look at the meters you have to watch your eyes! I use a 90 degree bnc elbow to get the antenna out of my face. Range doesn't seem too adversely effected.. I used to run it on the end of a short bnc jumper cable to hide it in the bottom of the bag until the tech at Comtek informed me that this was a no-no, impedance issues... The elbow seems ok though. Quote Link to comment Share on other sites More sharing options...
johnpaul215 Posted March 3, 2011 Report Share Posted March 3, 2011 Thanks Derek, I'll try the elbow. It's so freaking tall I already broke one off. Quote Link to comment Share on other sites More sharing options...
Jim Gilchrist Posted March 3, 2011 Report Share Posted March 3, 2011 Hey Johnpaul, I've also mounted the transmitter upside down and made a soft wire antenna. Still can be a problem, but better than being stuck in the eye. Best regards, Jim Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted March 3, 2011 Report Share Posted March 3, 2011 Anyone know of a good alternative to the stock M72 antenna? Using it for bag work is kind of a pain. Anyone try just making their own whip on a BNC connection? Yes, use a "floppy" antenna -- length about 15" -- and just let it dangle out the side of the bag. You can position it totally out of the way. I use them on several Comteks, both 72s and 216s -- even on the cart -- much less hassle. The range is good for most situations. I also have solid vertical ones for when I need a bit more range. Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted March 4, 2011 Report Share Posted March 4, 2011 I got a floppy antenna from Comtek in the correct cut. phil p Quote Link to comment Share on other sites More sharing options...
Raguini Posted April 22, 2013 Report Share Posted April 22, 2013 I have a question concerning the frequencies of the rf-72b. My receivers have a tv-10, 7, and 12 below the serial nimber. I can't figure out what that correlates to on the list of frequencies listed above - any suggestions? Quote Link to comment Share on other sites More sharing options...
studiomprd Posted April 22, 2013 Report Share Posted April 22, 2013 Hi, and welcome... <cap> toll free... very helpful... Quote Link to comment Share on other sites More sharing options...
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