http://elecraft.85.s1.nabble.com/KSB2-problem-status-befuddled-tp374866p374870.html
when I did the j11, 10 and 9 installation for finishing the K2. I am
sure I did not remove it. Will give it a go this afternoon and report
> Neal,
>
> Taking things in reverse order - go ahead and put the Noise Blanker
> itself
> back in rather than the 6 dB pad resistors. It will only affect the
> receive
> path and not the Transmit path.
>
> OK - your current draw at a constant 10 Watts output looks just fine
> to me.
> It is a bit unusual that your minimum current draw for 10 watts out is
> at 20
> meters - usually that will occur at 40 or 30 meters - but this does
> not look
> like a real problem to me (actually it indicates better efficiency than
> normal on the higher bands).
>
>
> so now that still leaves us with the original problem of excessive
> current
> draw in SSB mode. Actually something is 'fishy' here, because an SSB
> signal
> with no audio will result in very little output power (and quite low
> current
> draw). So my thinking now is that you do not have the SSB balance set
> properly - or there is something incorrect on the KSB2 board. I know
> it is
> difficult to do, but do look again - particularly at the balanced
> modulator
> and those things shown around it in the schematic. It does now seem
> that
> your problems are coming from the KSB2. Just as a wild guess I must
> ask -
> did you remove C167 from the RF board when installing the KSB2? If
> you fail
> to remove it, that alone could explain the conditions you are seeing.
>
> 73,
> Don W3FPR
>
>
>
>> -----Original Message-----
>>
>> Hi all,
>>
>> Thanks for giving some ideas!
>>
>> I checked the resistors on the bottom of the ssb board, they are all
>> correct. I must say that trying to identify parts on the top of the
>> board is a real challenge, its so stuffed that its almost impossible!
>>
>> Don, I redid the output amperage at 10 watts:
>> 80 - 2.68
>> 40 - 2.72
>> 30 - 2.28
>> 20 - 1.96
>> 17 - 2.42
>> 15 - 2.50
>> 12 - 2.24
>> 10 - 2.16
>>
>> At 10 watts on 40, the voltage on rx is 13.5 on tx its 12.9.
>>
>> The group is right, I did not notice the power output on lower than
>> 17m
>> (which is 15 watts). On 15 through 10, highest output is 13.3 watts.
>>
>> Do I still need to investigate the 40m current usage?
>>
>> Do I need to replace the 3 resistors and jumper that I pulled out to
>> eliminate the noise blanker module from the mix of things to
>> investigate? I should have done one module and waited to know it
>> worked
>> before doing a second one!
>>
>> Neal
>> On Feb 21, 2005, at 5:37 PM, W3FPR - Don Wilhelm wrote:
>>
>>> Neal,
>>>
>>> There may be nothing wrong with 40 meters after all - I had missed
>>> the
>>> point
>>> that you were setting the Power control to absolute max. What is
>>> your
>>> power
>>> supply voltage? 13.8 volts is typical (13.6 on the display), and
>>> lower
>>> power supply voltages will result in increased current draw. What is
>>> the
>>> voltage when you are seeing a current of 3 amps or greater?
>>>
>>> I don't have a straightforward answer here. Can it be that your
>>> Carrier
>>> Balance is not correctly set and you are really generating more RF
>>> drive
>>> with SSB than with CW?
>>>
>>> It is not really a fair comparison to compare current draw from band
>>> to band
>>> with the Power control set all the way clockwise. Set it to 10 watts
>>> and
>>> check the current drawn for each band and both CW and SSB modes.
>>> Actually SSB mode should draw little current without audio (if the
>>> carrier is
>>> balanced because there should be little or no RF output.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>>> -----Original Message-----
>>>> Hi Don and all,
>>>>
>>>> I have spent the afternoon looking for where I could have made a
>>>> mistake on the 40m LPF circuit. I didn't find any obvious ones, the
>>>> toroids came from 'The guy de Toroids' but I counted them all
>>>> anyway,
>>>> and they are (luckily!) correct. Same for capacitors. Did the run of
>>>> voltage checks and didn't notice anything really wrong.
>>>>
>>>> On cw, cranking the output knob to the max, the display readings for
>>>> current are
>>>> 80 3.22
>>>> 40 3.36
>>>> 30 2.84
>>>> 20 2.38
>>>> 17 3.08
>>>> 15 2.84
>>>> 12 2.62
>>>> 10 2.42
>>>>
>>>> Output reads over 15 watts in all cases, usually abt 15.2. This
>>>> reads
>>>> pretty much the same with or without the SSB module installed.
>>>>
>>>> I take it from your comments that the fact that 40m is the highest
>>>> cw
>>>> reading, its indicative of something wrong. Looked at LPF and BPF
>>>> areas. What should I expect on the amp readings, 2.35 on 40 and a
>>>> gradual increase as I go towards 10m?
>>>>
>>>> I could reinstall the resistors and jumper and take out the noise
>>>> blanker module as thats something put in yesterday, I take it that I
>>>> need to do that if I want to test without it?
>>>>
>>>> I have boosted cal cur to 4.0 and still can get hi cur signal with
>>>> output fully counterclockwise on both usb and lsb. I have been very
>>>> happy working cw all week as it is (set the cal cur to 3.5 and it
>>>> hasn't tripped yet).
>>>>
>>>> Any more ideas to look at?
>>>>
>>>>
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>>>
>>
>>
>
>
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