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


Garey Barrell  made an utterence to the drakelist gang
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Dave -

Yes, I believe that to be the case.

The transceive line carries the "Premix" signal (HFO - PTO) between the 
two units, so an HFO crystal should not be required in both units.

Obviously the Band switches on both units have to be on 1.5 - 3.0 band, 
and the crystal switch on the R-4C would have to be on "1" or whatever 
socket the 12.6 MHz crystal is in and the crystal switch on the T-4XC 
would have to be on Norm.

The T-4XC is also stretched to hit the bottom of the 160M band at 1.8 
MHz.  Sometimes a little touch-up of the alignment is needed to get it 
down to 1.8MHz.   Guess they didn't want us to get down into the BC band!

73, Garey - K4OAH
Atlanta

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



David Havel wrote:

>Gary,
>
>>From your email below, are you saying that you can xmit. (in RCVR mode) with
>only a crystal in the receiver, and without having one in the T-4XC?  Mine
>doesn't seem to want to tune or load on 160 meters with the xtal installed
>in only my R-4C.
>
>Thanks in advance for clarification!
>
>73,
>Dave - NO3K
>
>
>
>-----Original Message-----
>From: owner-drakelist{at}www.zerobeat.net
>[mailto:owner-drakelist{at}www.zerobeat.net] On Behalf Of Garey Barrell
>Sent: Sunday, February 27, 2005 10:16 PM
>To: Eric Webner; Drakelist
>Subject: Re: [drakelist] 20.8 MHz (30 Meter) T-4XC Crystal wanted
>
>
>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 folks like to listen to CW at a somewhat lower frequency.
>
>73, Garey - K4OAH
>Atlanta
>
>Drake C-Line Service Manual
>http://hr99.home.mindspring.com/R-4C_Servicez/>
>
>
>
>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 recommended 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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