[VHFcontesting] Re: 902 vs 903

dpease at adams.net dpease at adams.net
Thu Sep 2 12:39:00 EDT 2004

Personally, I see advantages to using 145 over 144 for the IF, especially at 
stations where there are more than one transverter using 2 meters for an IF. 
I would think you would want the option of using either 902 or 903 simply by 
changing the IF rig frequency rather than having to change a crystal in the 

Danny  NG9R 

Zack Widup writes: 

> On Wed, 1 Sep 2004, Lee Scott - AA1YN wrote: 
>> I've been through the dilemma and started with a 902.  The activity in the 
>> eastern US is on 903MHz but in the west, it is on 902.  There has been a 
>> lot of talk (no action) on switching the weak signal calling freq to 902 
>> but it hasn't happened yet. The reason I purchased a 902 rig was that I was 
>> using a DSP-10 for the IF which made everything transparent. When my DSP 
>> went south a year ago, I bought an FT817 which made 903 on a 902 rig 
>> inconvenient as I needed to have the IF at 145MHZ for 903 and 144MHz for 1296. 
>> The only difference between the two rigs is a crystal so if you pick up a 
>> 903 and later on down the road find you need 902, you just re-crystal the 
>> rig. That is what I did to get a 903 rig but I saved the crystal for 902. 
> When I originally built a 33 cm transverter, I got a crystal for 144 = 902 
> MHz, then found out that everyone else around here was using 903 MHz.  So 
> I got another crystal to make 144 = 903. 
> I may build another transverter with the old crystal for 902 and 
> phase-lock it to a 10 MHz reference for accuracy.  With the IF rig I'm 
> using (a modified HTX-100), there's no reason I can't program one of the 
> memories for 145 MHz to get on 903 and just switch memories to change to 
> the higher bands. 
> Zack W9SZ 
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Danny Pease
dpease at adams.net 

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