[Elecraft] Fwd: Receive Align K1 #2999

[Don Wilhelm]

  Don,

Compare the voltage on U4 pin 7 to your power supply output voltage, if 
your input voltage is low, many of the other voltages will be lower too.

On the receive problem - Do you have the jumper across the band board J2 
installed?  If not present (if the KAT1 is absent), there will be no 
transmit or receive.

Since you mentioned T2, I assume the 4 band board.  I suspect you do not 
have the Pre-mixer bandpass filter tuned properly.  You must tune 30 
meters before 40, and similarly 15 (or 17) meters before 20.

Initially set the trimmers so the screw slots are parallel with the long 
edge of the board.  The proper position will be less than 1/8 turn away 
from that starting position - tune slowly.  Using  a single signal is 
difficult if you cannot hear it because you must tune the K1 to the 
frequency of that signal.  A broadband noise source is often easier for 
initial adjustment - tune for maximum noise first, and then see if you 
can hear the signal.  Connecting an antenna can often serve as a 
broadband noise source due to atmospheric noise on the HF bands.

If you have an RF Probe or an oscilliscope with a 10X probe, you can use 
an alternate method to tune the pre-mixer bandpass.  Monitor the RF 
voltage on P1 pin 6 and adjust the trimmers for maximum RF voltage.

Once the pre-mixer bandpass is tuned, you should be able to hear a 
signal on the band being adjusted.

73,
Don W3FPR

On 5/14/2011 2:01 PM, k4ynd at comcast.net wrote:
> ----- Forwarded Message -----
> From: k4ynd at comcast.net
> To: support at elecraft.com
> Cc: elecraft at ath.net
> Sent: Saturday, May 14, 2011 1:55:52 PM
> Subject: Receive Align K1 #2999
>
>
>
>
> Please help...
>
>
>
> I finished the receive section. The VFO adjust went great. I then hooked up my FT 450 D to a dummy load and lowered power to 5 watts. I can not hear the signal or anything else. I just hear static (I have a 40 meter ant connected to the K1).  When I press my finger on T2 and move it a little :the static / noise level jumps up  and I can hear a broadcast station faintly
>
>
>
> All of the voltage checks on page 7, appendix E checkout except:.The following seem a little off on RF-U4
>
>
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> Per manual- Actual
>
> Pin 6  6.6v --  5.1v
>
> Pin 7  13.6v --  10.6v
>
> Pin 8   6.8v--   5.95v
>
>
>
>
>
> I am having a great time on the build but need some help
>
>
>
> 73
>
> Don
>
> K4YND
>
>
>
>
>   
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