From: Garey Barrell 
Subject: Re: [drakelist] 20.8 MHz (30 Meter) T-4XC Crystal wanted


Garey Barrell  made an utterence to the drakelist gang
----------------------------------------------------------------------
Eric -

I think you've got this straightened out.  

The chart says the 21.1 MHz crystal is for use from 10.25 - 10.5 MHz.  
(Period)

It also says the 20.8 MHz crystal is for use from 10.0 - 10.2, and Do 
Not Use Between 9.90 - 10.0.

17M can be covered with the 29.1 MHz crystal.   The only area of concern 
is the PTO frequency range around 5 - 6 MHz and the second harmonic 
around 10 - 12 MHz.   The area 2.3 - 3.0 is also off limits because of 
mixer spurs from combinations of the above.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
http://hr99.home.mindspring.com/R-4C_Servicez/>



Eric Webner wrote:

> Garey,
>  
> The T-4XC manual indicates that if you use a 21.1 MHz crystal, the 
> usable freq is 10.25 - 10.5 MHz. The column that says "Do Not Use 
> Between" is blank.
>  
> I would like to add 30 meters and possibly 17 also, but it seems to 
> have a few caveats.
>  
> 73,
>  
> Eric KA8FAN
>
>
> */Garey Barrell /* wrote:
>
>
>     Garey Barrell made an utterence to the drakelist gang
>     ----------------------------------------------------------------------
>     Eric -
>
>     There is a very good reason for using the 20.8 MHz crystal instead of
>     the 21.1. There are several spurious outputs in and around 10 MHz
>     when using the 21.1. This is specified in the T-4X(any) manual
>     with "do
>     not use" ranges for certain crystals. Keep in mind that the PTO
>     operates in and around 5 MHz.....
>
>     And yes, you can transceive on any crystal you have in the
>     receiver, but
>     the same problems occur with a 21.1 MHz crystal in the R-4(any). If
>     you just want to listen to 10.1 - 10.150 the 21.1 MHz crystal will
>     work
>     in the receiver. But don't transceive using that crystal. Transceive
>     isn't all that satisfactory on CW anyway, since the offset is
>     around 900
>     Hz and most f! olks like to listen to CW at a somewhat lower
>     frequency.
>
>     73, Garey - K4OAH
>     Atlanta
>
>     Drake C-Line Service Manual
>
>
>
>
>     Eric Webner wrote:
>
>     > I wonder if the 21.1 Mhz crystal would work as well. It sure
>     would be
>     > a lot easier to operated the vfo, since the band would start at
>     10.0
>     > Mhz instead of 9.7 or whatever the manual says.
>     >
>     > Can you experts tell me what it takes to transceive on accessory
>     > crystals? Can I get a crystal for the receiver, set the T-4XC mode
>     > switch to "RECEIVE" and be able to transmit and
receive on the 30
>     > meter band?
>     >
>     > 73,
>     >
>     > Eric KA8FAN
>     >
>     > */David Havel /* wrote:
>     >
>     > Hello gang,
>     >
>     > I'm in search of a 20.8 MHz crystal for my T-4XC in order to put
>     > it on 30 meters. According to the manual, the 20.8 unit is the
>     > only recom! mended crystal for use on this band. If you have one
>     > you'd like to sell, please email me what you're asking for it!
>     >
>     > Thank you in advance & 73,
>     >
>     > David Havel - NO3K
>     >
>     >
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