[GE] GE MVP ICOM questions

[de Rick K5RIC]

Chris,

It has been a while since I looked at a 2PPm board for MVP, but I was
thinking that the board only supported one Module, not two.  When we got
some MVP's from GE some years back they had the 2PPM Tx module, and I
wondered if you could upgrade the RX, but (my memory on this is some years
ago) I was thinking it only supported the TX or only one module.  If you
know of a kit with a board that supports two modules I would like to know
the Part Number as I am building some repeaters that are authorized under
NTIA not FCC, and the NTIA specs the RX as well as the TX.  I may not need
to do any MVPs but I am doing some Master IIs at this time.  And I was
thinking that the Exec II could be used if we had some of those boards and
2 PPM modules.  I guess I could get two boards and that would work in an
Exec II, but in an MVP not enough room. 

Where are you at these days and what are you doing?
 

73

rick k5ric




At 05:26 PM 4/4/02 -0600, Cboone@earthlink.net wrote:
>ICOMs?? As in the MII ICOMs or the MVP open xtal elements??? 
>
>The 2C ICOM can be used on both TX and RX of the MVP IF YOU wish..
>it was required in the MVP for base/control station use under Part
>90 and 95..the rcvr was stable enough....The standard elements are 5ppm.
>You DO need the adaptor board which allows the ICOMs to be plugged
>in and then it connects to there the open elements would go..
>
>High side vs low side....you can use any ICOM/element you wish as
>long as the xtal works in it...there are NO tuned elements in either
>one..
>
>On UHF radios, I have installed the xtals myself...but if you feel
>unsure about that yourself, send the ICOMs to ICM or whoever you buy
>xtals from...The open elements are easy to do yourself..BUT I never
>have any problem either way with the ICOMs..
>
>BUT in your temp range, I would definitely use the ICOMs on BOTH TX
>and RX and have the factory put the xtals in and align the elements..
>Also NOTE if you donot use the ICOMs, the temp compensate line
>on the exciter WILL pull the rcvr xtal off freq in rptr mode...
>With the 2C elements ONLY, there is no problem....If you use the 
>5C ICOM or the std xtal elements, you WILL have the problem unless
>you modify the rcvr for a FIXED 3.9V DC into the element...
>I always do that for MVPs..
>
>Chris
>WB5ITT
>
>"Thomas L. Staley Jr." wrote:
>> 
>> Hello All,
>> 
>>     I have a few questions about MVP ICOMs.  I have searched but not
>> found a list of ICOM numbers for any band but UHF, is there a list for
>> the other bands that I have missed?
>> 
>> I am interested in the 2ppm  versions.  I appears that this would apply
>> only to the TX side?
>> 
>> I an also interested in high side injection vs the normal low side
>> injection.  I see that there are different ICOM part numbers for this.
>> Is there any real difference? i.e. can I use a low side injection ICOM
>> in a high side application?
>> 
>> In other words, how interchangeable are the various  MVP ICOMs?
>> 
>> Would buying the crystals and me tuning the ICOM vs having the whole
>> thing sent out be the way to go?  I'm new to this without much RF
>> equipment.  The machine will need to operate in a temperature range from
>> 
>> about -10 to 110 degrees F.
>> 
>> Thanks,
>> Tom N8LBT
>>
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