[VHFcontesting] Calling Frequency Northeast on 900 MHz

[specrisk at aol.com]

 To all-

 I have 2 DEM transverters for 900 MHz  I built from kits. One has a 144 Mhz IF and the other has 28 MHz. I have both crystals for each transverter  but I could also just use  the 902 crystal and tune higher. The only issue is whether the filters are too sharp to give me uniform gain but I think I could peak a 1 MHZ segment easily  with only minor tweaking so I am inclined to just replace the 903 crystal with the 902.  I guess having both frequencies is the way to go and it is easier than installing a switch where  the oscillator is in an oven type enclosure.Thanks for the input.

George, W1JHR

 




 

 

-----Original Message-----
From: Sean Waite <waisean at gmail.com>
To: Jarred Jackson <Jarred.Jackson at hotmail.com>
Cc: VHF Contesting <vhfcontesting at contesting.com>; specrisk <specrisk at aol.com>
Sent: Wed, Feb 14, 2018 6:44 pm
Subject: Re: [VHFcontesting] Calling Frequency Northeast on 900 MHz


I kind of wish we used 902.1 in New England. With SG lab transverters and my ft290rii it'd eliminate a lot of knob turning. I was looking into switches on the jumpers, it's not a bad idea with all of the potential options these things have inside of them. 


Sean WA1TE 


On Wed, Feb 14, 2018, 18:21 Jarred Jackson <Jarred.Jackson at hotmail.com> wrote:

George,


I use both frequencies in western NY. Both my DEMI and my SG-Labs transverters work using a 144/902 & 145/903 setup. One of my rover locations is next to a commonly used repeater operating with an output of 145.11 and so 903.1 is nearly impossible. In another location I get some kind of digital burst noise on 902.1, so having a choice is important for me and its great when others have a choice as well. The SG-Labs box also handles 927.5 just as well with an LO jumper change. Wiring this out to a switch allows lots of options.


Jarred - KF2MR


________________________________
From: VHFcontesting <vhfcontesting-bounces at contesting.com> on behalf of G. Vaccaro via VHFcontesting <vhfcontesting at contesting.com>
Sent: Wednesday, February 14, 2018 4:35 PM
To: vhfcontesting at contesting.com
Subject: [VHFcontesting] Calling Frequency Northeast on 900 MHz


 In the past 903.1 was the weak signal calling frequency for weak signal work in the Eastern US. . Due to interference, it has been suggested to  use 902.1 which would make it the same for all the US. Have most East Coast stations done this or is 903.1 still in use?  I am interested  in the June Contest and I am debating installing  a second crystal for the lower segment or just removing  the 903 crystal.



George, W1JHR, FN42


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