[Elecraft] [KX1] Alignment Question

[Chris Johnson]

Hi Don,

I am using my elmer's very expensive service monitor to watch the frequency that the KX1 is generating.   I set the VFO to a given frequency, type that same frequency into the service monitor, then start a solid tune on the KX1.  There is a BNC cable connected between both devices.   The service monitor then shows on its spectrum display the exact frequency the KX1 is generating and also shows how many Hz it is deviating from the frequency entered.   Are you saying that BFO / DDS settings are only dealing with the RX portion of the KX1?   I understand you thinking this because the offset is ~ 600hz, the standard offset for CW.   This is not the case, and only happens on 40m.   TX deviation on 80m, 30m, and 20m is only off by a few hz.

If this is controlled by the firmware, how can this be calibrated?   I picked up a second KX1 off eBay this week for an emergency radio and will also check its alignment.

Thx

Chris
K6OZY

On Dec 18, 2012, at 1:26 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Chris,
> 
> There is one thing that might produce the condition you state, and that is if you have 40 meters set for USB.  Tap the band button and see if there is a "u" in the left of the display when the "7" digit is displayed.
> 
> The KX1 firmware controls both the transmit and receive frequencies.  The receive frequency is offset by whatever you set into the sidetone pitch, and the frequency indicated on the dial should be the transmit frequency.
> 
> So, if the transmit frequency is indeed off, it must be due to the firmware.
> That has nothing to do with the BFO and DDS settings on the KX1.
> 
> 
> Are you certain the receiver you are using to listen to the KX1 is in CW mode?  If it is in SSB mode, its dial indication may be shifted by the amount that receiver has set in its sidetone pitch parameter.  I know Yaesu changes the displayed frequency when going from SSB to CW, and they shift the transmit frequency when in CW mode.  Elecraft does it differently and always displays the transmit frequency, but shifts the frequency for receive.
> 
> 73,
> Don W3FPR
> 
> On 12/18/2012 2:39 PM, Chris Johnson wrote:
>> I guess using the word "Dial" may be misleading.   I am simply trying to say that on 40m the frequency that is being transmitted on is 685 hz higher than what is on the display.   This is only on 40m.  The other 3 bands are pretty accurate.  The BFO and DDS menu options are set to 0.
>> 
>> 
>