[VHFcontesting] Re: 902 vs 903

[KA6AMD]

I originally got my DEM 902 transverter with the 903 MHz crystal. 
Unfortunately here in the West, the frequency of choice is 902.1.  The IF 
rig I was using was a TR-9000.  The crystal sets up so that 903=144 MHz. 
This means that to use 902.1, I have to go to 143.1.  The old TR-9000 was 
not able to tune below 143.9.  So I ended up getting a new crystal.

The point is that almost all 2M multi-mode rigs can go to 145.1 so a 
transverter crystalled for 902 MHz will work great on 903.  Its not 
necessarily so for the reverse.  Just some hard won experience to pass 
along.

Erich, KA6AMD
DM15bp

----- Original Message ----- 
From: <dpease at adams.net>
To: "Zack Widup" <w9sz at prairienet.org>
Cc: "VHF Contesting" <vhfcontesting at contesting.com>; "Lee Scott - AA1YN" 
<aa1yn at aa1yn.com>
Sent: Thursday, September 02, 2004 9:39 AM
Subject: [VHFcontesting] Re: 902 vs 903


> 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 transverter.
> 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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