[Elecraft] K1 Transmitter problem

[Dennis Rayfield]

Don,

Thanks for your questions and helping me work through this.  The RF voltages I'm seeing are (on 30 M) are:

PRE -   .068
ATTN - .023
OSC -   .014
MIX -    .105
BUF -  1.37
TR1 -    .62
BPF -    .076

The DC voltages on page 46 were all within the ranges indicated.

The output power in tune show P0.1 on all bands except 15M, there it moves up to P0.3 and stops there.  I'll check the RF voltages at all points on all bands tonight after work...

73,

Denny



On Feb 29, 2012, at 10:17 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Denny,
> 
> Tell us more - what band, and what
> rf voltage are you reading at the Transmit mixer output (pin 4)  How 
> about th DC voltages?
> 
> 73.
> Don W3FPR
> 
> On 2/29/2012 10:04 PM, Dennis Rayfield wrote:
>> I've build an RF Probe, and worked through the transmitter signal tracing section.  All of the voltages are within range until I get to the band-pass filter.  I'm just reading .07 volts rather than the 0.5-1.0 that it should read.  I have the 4 band module (40, 30, 20, 15) and the relays click when I change the bands.
>> 
>> Thanks for any help.
>> 
>> 73,
>> 
>> Denny - KI3F
>> 
>> 
>> 
>> On Feb 28, 2012, at 10:12 PM, Don Wilhelm<w3fpr at embarqmail.com>  wrote:
>> 
>>> Dennis,
>>> 
>>> It sounds like you need to turn the manual to the Transmit Signal Tracing section in the back of the manual.
>>> Once you isolate the failure to a specific stage, we can help you isolate to the component level.
>>> Right now, all we can say is that there is a problem somewhere in the transmit path.
>>> You might want to check for soldering problems, unsoldered components or those where the solder did not flow out adequately onto both the component lead and the thru-plated hole.  Re-flow the soldering with a hot soldering iron - 750 degF if you used leaded solder, 800 degF if you used unleaded solder.
>>> 
>>> 73,
>>> Don W3FPR
>>> 
>>> On 2/28/2012 9:58 PM, Dennis Rayfield wrote:
>>>> I'm building a K1 and have everything finished and am at the stage for transmitter alignment and test.  I use the out menu to set the output to 3 watts, but when I put it into tune mode it immediately shows P0.1 on the display and there is no power out.  When I take it out of tune and go back to the out menu, that still shows 3 watts.
>>>> 
>>>> Any suggestions where I should start with this?
>>>> 
>>>> Thanks for any suggestions.
>>>> 
>>>> 
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