http://elecraft.85.s1.nabble.com/K2-Transmitter-Alignment-tp441101p441109.html
Voltage is fine. Running on a quality 25 amp ps. No scope here so I'll
> Doug,
>
> First, what is your power supply voltage? Is it sagging during transmit?
> An easy way to check is the tap the DISPLAY button and then enter tune - the
> display will show you the voltage and current. If the voltage is sagging
> low, blame your power supply or the connecting cable.
>
> If the voltage is good (12.5 to 13.8 volts) during transmit, then you do
> have a problem with the transmit chain gain. Check T1, T2, T3 and T4
> carefully. Make certain they are wound with the proper number of turns and
> look like the diagrams in the manual.
>
> If all is OK in the above checks, then the problem source will have to be
> found the hard way. The first step is to make up the RF Probe shown in
> Appendix E of the K2 manual (parts are included with the kit). If you have
> a good 'scope, you can use that rather than the RF Probe. What you will
> need to do is go through the Transmit Signal Tracing procedure in the K2
> manual Appendix E. You will be looking for the stage where the RF voltage
> becomes significantly less than the expected value listed. If you need
> assistance with this signal tracing procedure, just ask and we can provide
> more details.
>
> 73,
> Don W3FPR
>
>
>> -----Original Message-----
>> From: Doug Person [mailto:
[hidden email]]
>> Sent: Tuesday, November 21, 2006 6:35 PM
>> To:
[hidden email]
>> Cc:
[hidden email]
>> Subject: Re: [Elecraft] K2 Transmitter Alignment
>>
>>
>> Hi Don,
>>
>> I found the problem. and you were right - it was the bandpass filter.
>> I had C220 and C221 reversed. After a bit of fooling around and
>> realigning, 17 is OK.
>>
>> What I now have is generally low output. About 9 watts 80 through 20, 6
>> watts on 15 and only 3.5 on 12 and 10.
>>
>> Any thoughts?
>>
>> Thanks & 73,
>>
>> Doug -- K0DXV
>>
>> Don Wilhelm wrote:
>>
>>> Doug,
>>>
>>> The only thing unique to 17 meters is the 15/17 m bandpass
>>>
>> filter and the
>>
>>> 17/15 m Low Pass filter, and I would suspect the bandpass
>>>
>> filter as the most
>>
>>> likely.
>>>
>>> Look first at the slugs of L10 and L11 - they should be about the same
>>> distance down from the top of the cans - if they are not, check
>>>
>> capacitors
>>
>>> C30, C31, C35 and C36 for proper values and proper soldering.
>>>
>>> If the slugs are the same distance down in the cans (within a
>>>
>> half turn),
>>
>>> then check the trimmers C32 and C34. The trimmers will normally be set
>>> close (within 20 degrees of rotation) to the midpoint - the slots in the
>>> trimmers perpendicular to the flat side. If that is not the
>>>
>> case (and the
>>
>>> checks above for the 15 meter tuning are correct), then the most likely
>>> thing is a soldering problem at relay K6 or trimmer capacitors
>>>
>> C32 and C34.
>>
>>> Look at the RF Board schematic sheet 3, and on the left side
>>>
>> find the 15/17m
>>
>>> bandpass filter. Check all the components shown in that
>>>
>> schematic area for
>>
>>> proper soldering and correct values. Include relay K6.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>>
>>>
>>>> -----Original Message-----
>>>>
>>>> I have completed Transmitter alignment. With the power set to
>>>>
>> two watts
>>
>>>> - I get 2 watts or better on all bands except 17 where I get only .5
>>>> watts out regardless of the power setting.
>>>>
>>>> Any help appreciated.
>>>>
>>>> Thanks,
>>>>
>>>> Doug -- K0DXV
>>>>
>>>>
>>>>
>>> _______________________________________________
>>> Elecraft mailing list
>>> Post to:
[hidden email]
>>> You must be a subscriber to post to the list.
>>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>>
http://mailman.qth.net/mailman/listinfo/elecraft>>>
>>> Help:
http://mailman.qth.net/subscribers.htm>>> Elecraft web page:
http://www.elecraft.com>>>
>>>
>>>
>>>
>>
>> --
>> No virus found in this incoming message.
>> Checked by AVG Free Edition.
>> Version: 7.1.409 / Virus Database: 268.14.7/538 - Release Date: 11/18/2006
>>
>>
>>
>
> _______________________________________________
> Elecraft mailing list
> Post to:
[hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>
http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help:
http://mailman.qth.net/subscribers.htm> Elecraft web page:
http://www.elecraft.com>
>
>
Subscriber Info (Addr. Change, sub, unsub etc.):