[600MRG] K3 Owners

[Eric NO3M]

RR Sorry, meant "TEST".  Was looking at the K3's menu (it's on 160M now 
set to "nor").  Brain a little distracted.

Thinking back to the filtering issue, I seem to remember that it was 
related to the GEN coverage filter board since you mention it.  Just 
running CONFIG:KXV3=TEST and putting the rig on the desired band will 
engage the GEN coverage filtering when outside of the preset Ham band 
filter edges, so re-tuning the 30M filter is not required if the GEN 
coverage filter is installed.

However, when setup as a transverter band, the GEN coverage filtering 
was not engaging when moving outside the underlying Ham band filter 
preset edges.  I think I brought that to the attention of Elecraft at 
the time.  This resulted in the observed RX loss (IF = 7.475) when used 
as a transverter band (but was fine if only CONFIG:KXV3=TEST and rig 
tuned to 7.475).  It could be gotten away with on 20M because the 20M 
bandpass fitler was wide enough.

As far as I know, transverter TX is not filtered, fed straight out the 
XVTR OUT BNC port.  Seemed to work fine in either of the above modes.

If Wayne just adds something in the firmware to have a transverter band 
act like the simpler CONFIG:KXV3=TEST mode to engage the GEN converage 
filtering when needed, there shouldn't be any reason to retune Ham-band 
passband filters if one already has the GEN coverage filter boards 
installed (I have them on both main and sub receivers for that 
particular rig).

73 Eric NO3M / WG2XJM

On 01/26/2014 02:46 AM, Edward R Cole wrote:
> Eric,
>
> I'm kind of puzzled by what you write.  On my K3 (SN 4340) the KXV3 
> mode under CONFIG menu shows three choices:
> 1)  Not installed
> 2)  NOR
> 3)  TEST
>
>
> Its my understanding that TEST bypasses the output filters so one can 
> transmit any frequency from 490-KHz to 30-MHz at   a power of 
> 0.1-1.5mw.  To operate on 600m using the TEST mode one has to have the 
> GEN Coverage filter installed.
>
> The new field-test sw just released addresses transverter operation on 
> 10-MHz and extends use up to 10.5 MHz.  I think all transverter 
> interfacing bypasses the HF LP filters and runs the transmitter at mw 
> level.  But this may only apply at VHF transverter use?
>
> Running a 630m transverter using a 10-MHz LO as one would have to 
> filter the output to eliminate images and LO feedthru.  That should be 
> easy at 472-500 KHz.
>
> N6KR addresses bandpass re-tuning for operation at 10.5 MHz (if needed).
>
> 73, Ed - KL7UW
>
> At 06:56 PM 1/25/2014, Eric NO3M wrote:
>> I am wondering if any of filtering is being bypassed in "transverter 
>> mode"?  I have been using the K3 as the 10 MHz IF rig for quite a 
>> while, but with the KXV3 parameter just set to "nor" and rig tuned to 
>> 30M.  In that mode, the band filtering is bypassed; however, in 
>> "transverter band" mode, the filtering was NOT bypassed.  I don't 
>> know if that ever changed, but I first noticed this when playing 
>> around with 7 MHz LO/IF a while back, and finding a nearly 18-20 dB+ 
>> loss between modes.
>>
>> Waiting to get a copy of the beta-test firmware to see if there is 
>> any noticeable differences in performance, etc., with how it's been 
>> running.
>>
>> TU Jay, W1VD, for the 160M QSO!  Terrible static on the southeast and 
>> south beverage arrays tonight that is sporadic. Back to the contest.....
>>
>> 73 Eric NO3M / WG2XJM
>>
>> On 01/25/2014 10:24 PM, Michael Mussler wrote:
>>> Ken,
>>> I installed the external reference board in my K3 this week and I 
>>> had similar a similar exchange with Wayne concerning the possibility 
>>> of the 10 MHz IF. Our inquiries paid off; I got the firmware update 
>>> from him earlier today. This afternoon I replaced the LO in my 
>>> transverter with the 10 MHz reference that I also use into the K3. I 
>>> have the new transverter setup running on WSPR tonight and presto, 
>>> no frequency drift. I'll leave it running through the night and 
>>> decreasing temperatures in the shack to be certain, but it looks 
>>> like the modification was a complete success!
>>>
>>> Wayne was concerned about loss of gain at the upper end of the 10 
>>> MHz IF segment but I am not seeing any difference in signal levels 
>>> compared to the setup with the 7 MHz LO and IF. It doesn't look like 
>>> I'll need to tweak the tuning adjustments in the K3 that he 
>>> suggested might be needed.
>>>
>>> 73
>>> Mike
>>> AI8Z
>>> WD2XSH/12
>>>
>>>
>>
>>
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>
> 73, Ed - KL7UW
> http://www.kl7uw.com
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