Re: [RCSE] WTB: JR Freq Module (21, 32)
I have eight JR Tx modules; four are PPM only, four are PCM. The PPM crystals are not removable. The crystals in four PCM modules are normal and easily removable/changeable. I believe the four PPM-only modules are older (from Century Seven systems). The age of the PCM modules vary from 10 years to brand new. Horizon sells matched Tx/Rx crystal pairs with no caveat or disclaimer that I am aware of. I have not personally made a crystal change to a JR module (no desire) but the option to do so appears evident. Regis --- In [EMAIL PROTECTED], Simon Van Leeuwen [EMAIL PROTECTED] wrote: Hey there Andrew, That is correct. The XTAL in the TX module is hidden, ie: it is on the inside surface of the module housing and does not have attachments like plastic overlays to allow easy removal from the housing (not sure this is so on all module-based TX). This is/was considered adequate to be classified as inaccesible. Either way, it is the responsibility of the end-user to follow the instructions spelled out by the OEM. The end-user may not experience range problems by changing XTAL's in the module, the problem is with off-frequency eminations in channel(s) either side. This can (and does) shoot down those who may by one or two channels up or down on the flightline. Those who do experience strange behavior when in a group of fliers, check to see whether any of your buddies are on the next frequency...they may be inadvertently shooting you down. Quoting Andrew E Mileski [EMAIL PROTECTED]: Simon Van Leeuwen wrote: Nope, same rules up here in Canuckland. Err, no. Canada allows it. I have an e-mail from the Department of Communications stating that as long as the crystal was made user accessble by the maufacturer, and the crystal is available to end-users from the manufacturer, then it is okay. I contacted Horizon, and they told me that the crystal can be swapped within +-10 channels of the shipped channel on my 8103. They of course suggested always range checking too. Also, our radios are less than 1 Watt, which means they fall into the magic category of low power unlicenced transmitter. This means that anything goes, as long as it does not cause interference with a licensed user. There are very few licensed users on 72 MHz in Canada, and the band hasn't had any new licences issued in many years. -- Andrew E. Mileski Ottawa, Canada RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format Radius Systems Cogito Ergo Zoom RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] WTB: JR Freq Module (21, 32)
Simon Van Leeuwen wrote: Nope, same rules up here in Canuckland. Err, no. Canada allows it. I have an e-mail from the Department of Communications stating that as long as the crystal was made user accessble by the maufacturer, and the crystal is available to end-users from the manufacturer, then it is okay. I contacted Horizon, and they told me that the crystal can be swapped within +-10 channels of the shipped channel on my 8103. They of course suggested always range checking too. Also, our radios are less than 1 Watt, which means they fall into the magic category of low power unlicenced transmitter. This means that anything goes, as long as it does not cause interference with a licensed user. There are very few licensed users on 72 MHz in Canada, and the band hasn't had any new licences issued in many years. -- Andrew E. Mileski Ottawa, Canada RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] WTB: JR Freq Module (21, 32)
Hey there Andrew, That is correct. The XTAL in the TX module is hidden, ie: it is on the inside surface of the module housing and does not have attachments like plastic overlays to allow easy removal from the housing (not sure this is so on all module-based TX). This is/was considered adequate to be classified as inaccesible. Either way, it is the responsibility of the end-user to follow the instructions spelled out by the OEM. The end-user may not experience range problems by changing XTAL's in the module, the problem is with off-frequency eminations in channel(s) either side. This can (and does) shoot down those who may by one or two channels up or down on the flightline. Those who do experience strange behavior when in a group of fliers, check to see whether any of your buddies are on the next frequency...they may be inadvertently shooting you down. Quoting Andrew E Mileski [EMAIL PROTECTED]: Simon Van Leeuwen wrote: Nope, same rules up here in Canuckland. Err, no. Canada allows it. I have an e-mail from the Department of Communications stating that as long as the crystal was made user accessble by the maufacturer, and the crystal is available to end-users from the manufacturer, then it is okay. I contacted Horizon, and they told me that the crystal can be swapped within +-10 channels of the shipped channel on my 8103. They of course suggested always range checking too. Also, our radios are less than 1 Watt, which means they fall into the magic category of low power unlicenced transmitter. This means that anything goes, as long as it does not cause interference with a licensed user. There are very few licensed users on 72 MHz in Canada, and the band hasn't had any new licences issued in many years. -- Andrew E. Mileski Ottawa, Canada RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format Radius Systems Cogito Ergo Zoom RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] WTB: JR Freq Module (21, 32)
Hitec transmitters have the crystal exposed on the front of the case. Simon Van Leeuwen wrote: Hey there Andrew, That is correct. The XTAL in the TX module is hidden, ie: it is on the inside surface of the module housing and does not have attachments like plastic overlays to allow easy removal from the housing (not sure this is so on all module-based TX). This is/was considered adequate to be classified as inaccesible. Either way, it is the responsibility of the end-user to follow the instructions spelled out by the OEM. The end-user may not experience range problems by changing XTAL's in the module, the problem is with off-frequency eminations in channel(s) either side. This can (and does) shoot down those who may by one or two channels up or down on the flightline. Those who do experience strange behavior when in a group of fliers, check to see whether any of your buddies are on the next frequency...they may be inadvertently shooting you down. Quoting Andrew E Mileski [EMAIL PROTECTED]: Simon Van Leeuwen wrote: Nope, same rules up here in Canuckland. Err, no. Canada allows it. I have an e-mail from the Department of Communications stating that as long as the crystal was made user accessble by the maufacturer, and the crystal is available to end-users from the manufacturer, then it is okay. I contacted Horizon, and they told me that the crystal can be swapped within +-10 channels of the shipped channel on my 8103. They of course suggested always range checking too. Also, our radios are less than 1 Watt, which means they fall into the magic category of low power unlicenced transmitter. This means that anything goes, as long as it does not cause interference with a licensed user. There are very few licensed users on 72 MHz in Canada, and the band hasn't had any new licences issued in many years. -- Andrew E. Mileski Ottawa, Canada RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format Radius Systems Cogito Ergo Zoom RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] WTB: JR Freq Module (21, 32)
For what it's worth, FCC regulations do not permit crystal swapping in modules. Fred -Original Message- From: Les Grammer [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 26, 2005 9:25 AM To: Soaring Exchange Subject: [RCSE] WTB: JR Freq Module (21, 32) Anyone have a JR transmitter freq module on 21 or 32 they're interested in selling? Contact me direct if so. (Anyone use the practice of swapping out the crystals in their transmitter modules? I'd be interested in hearing whether it's a 'safe' practice or not.) RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] WTB: JR Freq Module (21, 32)
How about module swapping? It's the entire RF module, as opposed to just the crystal. -Original Message- From: Fred A. Sheplavy [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 26, 2005 08:37 To: RSCE Subject: RE: [RCSE] WTB: JR Freq Module (21, 32) For what it's worth, FCC regulations do not permit crystal swapping in modules. Fred -Original Message- From: Les Grammer [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 26, 2005 9:25 AM To: Soaring Exchange Subject: [RCSE] WTB: JR Freq Module (21, 32) Anyone have a JR transmitter freq module on 21 or 32 they're interested in selling? Contact me direct if so. (Anyone use the practice of swapping out the crystals in their transmitter modules? I'd be interested in hearing whether it's a 'safe' practice or not.) RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] WTB: JR Freq Module (21, 32)
Yes. This is an extremely dangerous practice and must be avoided ... in the USA only. If you do this in any other country it is not considered dangerous and is not illegal. Something magical happens when you cross the border apparently. -Ben Fred A. Sheplavy wrote: For what it's worth, FCC regulations do not permit crystal swapping in modules. Fred -Original Message- From: Les Grammer [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 26, 2005 9:25 AM To: Soaring Exchange Subject: [RCSE] WTB: JR Freq Module (21, 32) Anyone have a JR transmitter freq module on 21 or 32 they're interested in selling? Contact me direct if so. (Anyone use the practice of swapping out the crystals in their transmitter modules? I'd be interested in hearing whether it's a 'safe' practice or not.) RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] WTB: JR Freq Module (21, 32)
No problem. They were designed to meet the FCC requirements as they are the RF part of the transmitter. Fred From: Dave Brombaugh [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 26, 2005 11:59 AM To: 'Fred A. Sheplavy'; 'RSCE' Subject: RE: [RCSE] WTB: JR Freq Module (21, 32) How about module swapping? It's the entire RF module, as opposed to just the crystal. -Original Message- From: Fred A. Sheplavy [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 26, 2005 08:37 To: RSCE Subject: RE: [RCSE] WTB: JR Freq Module (21, 32) For what it's worth, FCC regulations do not permit crystal swapping in modules. Fred -Original Message- From: Les Grammer [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 26, 2005 9:25 AM To: Soaring Exchange Subject: [RCSE] WTB: JR Freq Module (21, 32) Anyone have a JR transmitter freq module on 21 or 32 they're interested in selling? Contact me direct if so. (Anyone use the practice of swapping out the crystals in their transmitter modules? I'd be interested in hearing whether it's a 'safe' practice or not.) RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] WTB: JR Freq Module (21, 32)
Nope, same rules up here in Canuckland. The TX front end requires tuning, whereas the RX does not (in most cases). This is precisely why modules were designed to be interchangeable...they contain the front circuitry with the XTAL that it was originally tuned to. Quoting Ben Diss [EMAIL PROTECTED]: Yes. This is an extremely dangerous practice and must be avoided ... in the USA only. If you do this in any other country it is not considered dangerous and is not illegal. Something magical happens when you cross the border apparently. -Ben Fred A. Sheplavy wrote: For what it's worth, FCC regulations do not permit crystal swapping in modules. Fred -Original Message- From: Les Grammer [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 26, 2005 9:25 AM To: Soaring Exchange Subject: [RCSE] WTB: JR Freq Module (21, 32) Anyone have a JR transmitter freq module on 21 or 32 they're interested in selling? Contact me direct if so. (Anyone use the practice of swapping out the crystals in their transmitter modules? I'd be interested in hearing whether it's a 'safe' practice or not.) RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format Radius Systems Cogito Ergo Zoom RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
