[Elecraft] NG0R - K2 160m alignment problem.

[John Hoaglun]

Hi Don,

It does not appear to have anything to do with the power setting. The LO P
message is there at any power setting for 80m and 160m since the 160m module
was added last night. 

I am assuming that LO P is a status that is read from the RF Product
Detector circuit at the output the of low pass filter rail.

I am assuming that since the other bands are working that with the W1 bypass
removed that it indicates that J1:pin1 to relay K2 to J1:pin9 works as
expected or there would be no RF for the other bands.

My line of thinking puts the 160m LP filter or relay K1 as the issue... but
that does not explain why 80m is a problem as well.

Other debugging/troubleshooting steps?

Thanks, JH


-----------------------------
John Hoaglun
NG0R - EN25
http://www.hoaglun.com

-----Original Message-----
From: Don Wilhelm [mailto:w3fpr at embarqmail.com] 
Sent: Monday, March 02, 2009 10:14 PM
To: john at hoaglun.com
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] NG0R - K2 160m alignment problem.

John,

There may be no problem - set the power to something grater than 2 watts.
With the KAT2 installed, the K2 automatically limits the power to 2 watts
for tuning.  If your power setting is a bit below that, the LO PWR message
may result.

73,
Don W3FPR

John Hoaglun wrote:
> I am having a problem with the 160m alignment.
>
> When I power up the radio I do not get any error messages. If I test 
> the receive antenna via the menu I can hear the K2 relay open and 
> close as expected.
>
> When I disable the ATU with the CALP/CALS setting and then try to 
> engage the radio via the Tune button @ the 2w level I am getting a "LO P"
message.
>  
> --I am hearing signals on 80m and 160m. (160m sounds great on the K2.) 
> --Using an analog DVM I see a blip on pin16 when I change bands which 
> suggests that relay K1 is working.
> --I can also hear relay K1 when I switch between the bands. 
> --If I put my finger on the relay I can also feel the relay move. 
> At this point I think that relays K1 and K2 work as expected.
>  
> --C75, C13, and C14 are installed on the RF board.
> --C68 and C153 on the RF board are installed and the proper values.
> --I used a solder pot when I prep'ed the toroids so I am confident 
> that I have a good connection.
> 80m worked well before I added the 160m module. Now I get "LO P" 
> messages on 80 & 160m.
>  
> Any suggestions?
>  
> -----------------------------
> John Hoaglun
> NG0R - EN25
> http://www.hoaglun.com
>   
>