Re: [Repeater-Builder] Bomar TC'ing elements and ICOMS
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 the Yahoo! Terms of Service.
Re: [Repeater-Builder] Bomar TC'ing elements and ICOMS
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/
Re: [Repeater-Builder] Bomar TC'ing elements and ICOMS
At 02:34 PM 12/19/2004 -0800, you wrote: 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. Many folks say I'm crazy but I've used Cal Crystal for probably close to 20 years. Occasionally there may be a problem but that is the exception. One of my repeaters (UHF) has been operational for over 25 years, using Cal xtals. It's xmt frequency varies, *maybe* by +/- 500 hundred cycles and I haven't had to touch it in at least 2 years. Ken (I think Cal is vastly underrated) -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We now offer complete Kenwood TKR repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
