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
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