Ok-- Let's ask a few burning questions regarding ham repeaters on 10m-70cm:
1. How much short term frequency instability is tolerable over 0-70 degrees C? 2. With regard to long term frequency stability, How often do you check and/or calibrate the repeater's transmitter and receiver's frequency? My answers: 1. +/- 500hz on 70cm, 250hz on 2m, and 100hz on 6m. 2. Once every 6-12 months. When the repeater is not within +/- 700hz, its time to make a trip to the site and recalibrate it. If this is happening sooner than 6 months, then the element tempco is sub-par. What about the rest of you? These criteria determines what crystal manufacturer to use. Steve WA6ZFT On Sunday 19 December 2004 07:08, Kevin Custer wrote: > Kevin Custer wrote: > >Q wrote: > >>The only company that truly does good element comp is ICM. > > > >Not True. > > > >Bomar does TC on user supplied ICOMs and Channel Elements. They charge > >$15 extra for this service over and above the price of the crystal. > >http://www.bomarcrystal.com/communication.htm > > > >Kevin Custer > > I thought I saved some information that came in a reply from Bomar's > > engineering department, here is that mail: > >----- Original Message ----- > >From: "Kevin Custer" <[EMAIL PROTECTED]> > >To: <[EMAIL PROTECTED]> > >Sent: Saturday, November 30, 2002 11:57 PM > >Subject: Channel element re-crystaling questions. > > > > > > > > > >Hi, > > > >I see you advertise the re-crystaling of popular channel elements for land > > mobile radios, and I have several questions. You state in your web > > advertisement that you have "CHANNEL ELEMENTS, TCXO'S & ICOMS - > > Supplied to meet or exceed original manufacturer and FCC specifications." > > If I send you a '2C' ICOM for a GE Mastr II and have you re-crystal it, > > will it actually be 2 ppm over the temperature > range of the element as > > stated by GE, or do you simply build the crystal and "net" it on > > frequency with no regard to the temperature compensation components? > > > >> Does your statement mean you temperature compensate the ICOM or Channel > >> Element to meet or exceed its original temperature specifications? Also, > >> if this is the case, is it done for the stated price: "We will > >> recrystal most elements for $25.00 each, 3 to 4 week delivery." Does the > >> price of $25 include the ICOM or Channel Element or do you require the > >> customer to send in their element for re-crystaling? > > > >We have had a recent bad stretch of luck with JAN in re-crystaling our own > > elements, and ICM simply charges too much for their services so we are > > looking for a suitable replacement company. Most of our crystal needs > > are for Amateur Radio conversions of Commercial equipment like the Micor, > > Mitrek, MVP, and Mastr II radio sets. My late father bought many > > crystals from your company a lot of years ago but had some trouble with > > them and eventually changed to JAN. I have no recent experience with > > Bomar but I am willing to give you a try. We don't buy a huge amount of > > crystals so I'm sorry to say I won't be a big volume buyer, but I'd > > appreciate knowing exactly what services you do provide and their costs. > > > >Thanks... > >Kevin Custer > >Repeater-Builder Dot Com > > Hi Reply: > >Kevin, > > > >We temperature compensate our channel elements. > >The $25 is if you supply the elements. Complete elements are $50. > >If I can be of further assistance please don't hesitate. > > > >David Miskov Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
