Garey Barrell <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]>/* 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 > > ------------------------------------------------------------------------ > Do you Yahoo!? > Read only the mail you want - Yahoo! Mail SpamGuard > .
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