Scott, Thanks for your summary and also the previous note regarding stabilty of xtals when using the rocks above 18 megs. My recieve xtal is 23 something so your experience mentioned was noted here.
But below you mentioned a rc xtal formula change from vhf but linked to the W4UWH method, which I used recently. It uses the standard VHF math. I think thats an error. Also on the IF/mixer, I made that one short on the bottom/non component side from a through hole on the board to a ground trace. It was easier than dealing with the resistor. Not sure if every board has a hole under that coil right where ya need it. 73 Don W5DK --- In [email protected], "Scott Zimmerman" <[EMAIL PROTECTED]> wrote: > > I went to the Condor site and notice that they don't give a formula for the Rx crystal, is it the same as for the M2 mod? > > I'm not sure. Here at repeater builder we use the following for 220 Mastr II's > > For the PLL exciter: (preferred) > http://www.repeater-builder.com/ge/mastrII222pllexciter.html > > For a phase exciter: > http://www.condor-connection.org/mods/mastr2.htm > > Helical assy: > http://homepage.mac.com/pseabolt/mods/rf_assembly.htm > > PA assy: (we use our AMPBD for a circuit board) > http://homepage.mac.com/pseabolt/mods/pa.htm > http://www.repeater-builder.com/products/ampbd.html > > Osc. Mult: (I have not found it necessary to replace the transistors as described) > http://homepage.mac.com/pseabolt/mods/oscillat.htm > > Mixer board: > http://homepage.mac.com/pseabolt/mods/mixer.htm > > In the above receive conversion, the crystal multiplication factor has changed from x9 to x12. You can now use the formula: fc=(fo- 11.2)/12. This should give you a crystal in the 17-18 MHz range. If you are ordering from Bomar Crystal, you can specify part #19A129393 \12. > > The above is for a Mastr II. I would think that the MVP and Exec II would be similar. I have only done an MVP exciter, not the complete radio, so I can't speak about how to convert the MVP receiver. > > Good Luck. > > Scott > > Scott Zimmerman > Amateur Radio Call N3XCC > 612 Barnett Rd > Boswell, PA 15531 > > ----- Original Message ----- > From: James H Vernetti > To: [email protected] > Sent: Tuesday, March 20, 2007 12:19 PM > Subject: Re: [Repeater-Builder] 220 conversion > > > Scott thanks for the info I am just in the planning stage for this project and trying to line all the ducks up in a row, I have both M2 and MVP available to convert. I went to the Condor site and notice that they don't give a formula for the Rx crystal, is it the same as for the M2 mod? > 73 > Jim wd0ekr > > > > ------------------------------------------------------------------- ----------- > > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.446 / Virus Database: 268.18.15/728 - Release Date: 3/20/2007 8:07 AM >
