[Elecraft] K3: SSB vs. CW/DATA A with TVTR

Udo Langenohl - DK5YA dk5ya at dk5ya.de
Wed Sep 7 09:29:17 EDT 2011


Don,

yes I'm measuring both peak and average power. I checked IFout pwr with 
my HP436A both in SSB and DATA A/CW. Did the same with my Bird peak/avg 
meter and the 25W head at the TVTR.
Mic gain shows up to 7 bars in the peak and with compression 0 or up to 
20 there's no increase. Max is 0.45 mW in SSB, says the HP463A, and 1.1 
mW in CW/DATA A.

I'll try ''TXG VCE'', John G4ZTR had that idea.

73 Udo, DK5YA

Don Wilhelm wrote:
> Udo,
>
> If you are measuring average power rather than peak power, you will see
> a marked reduction in average power with SSB even though the peaks are
> the same power as CW and DATA.
>
> Set your microphone level in the order indicated in the manual (you can
> use TX TEST). Set Compression to zero, then adjust the mic gain until
> you see 5 to 7 bars on the ALC meter.
> After that, increase the compression as desired.
>
> 73,
> Don W3FPR
>
> On 9/7/2011 8:58 AM, Udo Langenohl - DK5YA wrote:
>> When running my K3 with my DB6NT/Kuhne transverter on 144MHz IF out is
>> set to 1mW. That's o.k. for both CW and DATA A (WSJT), when 1mW is good
>> for 25 W out at the TVTR. Thats perfect for my 2x GU74b amp.
>> But in SSB it's completely different. My Heil Pro Set (electret) is
>> working great but with mic gain set to "10" and compress to "20" ALC
>> shows 6 to 7 units, compress some 10 but there aint no 1mW out at the IF
>> out anymore. It's quite below, app. 0.5mW in the peak and thats good for
>> not more than 10 W out at the transverter.
>> I wonder why in SSB the IF out is much lower than in CW and DATA A mode.
>> More mic gain aint help of course.
>>
>> Any idea what I'm doing wrong (probably?).
>>
>> Udo, DK5YA
>


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