On Nov 19, 2007, at 3:45 PM, Joe Landers wrote: > Hey everyone > > I want to ask a couple of questions and see if I get any replies
Replies, we can definitely do. Accurate replies require more than a mailing list, but there are some professionals here who'd love to quote you consulting fees. (GRIN - Not me.) > I am getting ready to change a frequency in a mastr II and I got to > buy some crystals Who is doing the best job at a resonable rate with > them nowadays . Ahh, the never-ending question of the list. This question has reached "religious" status with many here. :-) The general consensus: The bigger shops (International Crystal, Bomar, and maybe West Crystal) have all gotten good comments from some here, and others want to throw their rocks they received out the window. Different people, different opinions. Search the list archives for chrystal and plan on about an hour of reading. The other debate is whether to rock your own ICOM's or send the entire ICOM in for temperature compensation. That topic is contentious and near-continuous here on the list also. There's also some good information on the topic on the repeater- builder website, don't forget to look there. My comments: For public-safety applications... just going by your signature line... Send the ICOM's into a reputable manufacturer for full compensation. If they don't offer it, skip them. Get a full temperature comp done and have them install the rock. Plan on multiple weeks to get them back. Lives are on the line. Also note that they will still age over the first year or so, keep the test gear handy and re-tune a couple of times when necessary. It would help if you could be more descriptive about which band-split Mastr II you're moving and to generally what frequency. There are some tricks with ordering crystals for ham use (if you're not staying within their rated frequency spectrum) where ordering high-side injection versus low-side injection is a good thing. Kevin and Scott at Repeater-Builder also have put out some information in the past about why certain frequencies in the ham bands don't work as well with low-side injection as you push the MASTR II out of band. All up on the RB site. Good engineering information. > Secondly I have a radio I want to use for remote base use I need a > mike plug diagram of pinout diagram to make a jack for the controller > The radio info is as follows > > it is a maxon model 1520a mobile > plate on back has p/n 717810 > > no serial number No clue on that particular radio, but if it can't handle 100% continuous-duty key-down, and it's going into public safety work -- forget it. Or turn it down to where it will survive a week's keydown into a dummy load on the test bench. If it doesn't survive, buy something that can be keyed continuously and not blow up. You're the pro here, though -- I'm just an Amateur. Your mileage may vary. :-) -- Nate Duehr, WY0X [EMAIL PROTECTED]
