[Elecraft] K1 no power out B2

Mon Jun 11 22:10:22 EDT 2012

But...let me make one more suggestion.  Re-perform the transmitter-related tune up exactly as specified in the manual.  Tuning the two-band boards can be very critical and require adjustments of the coils well away from where they were peaked for receiver tune up.  The adjustments of the filter.board coils is far more critical for transmit than receive.  The receiver adjustments just get the coils in the ball park...the transmitter adjustments are what count.

KK5F

-----Original Message-----
>From: Mike Morrow <kk5f at earthlink.net>
>Sent: Jun 11, 2012 8:44 PM
>To: Joe McGerald <astro_crazy at hotmail.com>
>Cc: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K1 no power out B2
>
>If you will entertain a suggestion from the primodial ooz...check everything on the filter board at K3 (contacts 1, 4, 7, 10), L11, L12, C24, C25, and C26.  Check with ohmeter that ther is low ohm continuity between K3 contact 4 to 7, and high resistance from those two contacts to ground.  All these checks can be performed with the filter board out of the K1.
>
>KK5F
>
>
>-----Original Message-----
>>From: Joe McGerald <astro_crazy at hotmail.com>
>>Sent: Jun 11, 2012 6:59 PM
>>To: don at w3fpr.com
>>Cc: elecraft at mailman.qth.net
>>Subject: Re: [Elecraft] K1 no power out B2
>>
>>Well I just swapped the four band board into the questionable K1 and it
>>worked fine. Also I swapped one of the two questionable 2 band boards into
>>the working K1 and it did the same thing there, so I guess I indeed have two
>>non-functional 2 band boards. 
>>
>>Both do the same thing -- work on Band 1 (40M on one, 30M on the other) but
>>don't work on TRANSMIT on Band 2. (20 and 17 respectively.) They do receive
>>on these bands however.
>>
>>Any assistance in this mystery is gratefully appreciated.
>>
>>Thanks.
>>Joe
>>AF6NI
>>
>>-----Original Message-----
>>From: Don Wilhelm [mailto:w3fpr at embarqmail.com] 
>>Sent: Saturday, June 09, 2012 7:28 PM
>>To: Joe McGerald
>>Cc: elecraft at mailman.qth.net
>>Subject: Re: [Elecraft] K1 no power out B2
>>
>>Joe,
>>There is no difference between the SA602 and the SA612.  They come off the
>>same line and  while they all conform to the better SA612 specs, some hams
>>are convinced that the SA602s are "better", so they label some of them '602
>>- You will find many ham laments about the demise of the '602. but in fact
>>the '612 is a direct replacement.  Use the '612.
>>
>>As the prior poster has suggested, the RF board path from from P1 pin 2 to
>>U7 pin 4 is suspect, as is the path between P1 pin 1 ans U7 pin 5.
>>
>>Yes, it is possible to have enough signal coupling to provide good receive
>>but not enough to give adequate pre-mixer signal input on one band.
>>
>>73,
>>Don W3FPR
>>
>>On 6/9/2012 9:18 PM, Joe McGerald wrote:
>>> Thanks Mike. I double checked all solder joints and components in the
>>area. I also checked all voltages on U7. They are correct. Guess it could be
>>the chip. BTW the chip is the alternate, the 612.
>>> Joe
>>>
>>> Mike Morrow<kk5f at earthlink.net>  wrote:
>>>
>>>
>>> The only path through the KFL1-2 that is not in common use for both bands
>>is the pre-mixer bandpass filter connections at P1/J6, where band 1 path
>>goes through pin 1 and band 2 path goes through pin 2.  This suggests that
>>you need to check the RF board from J6-pin 2 back to U7 pin 5, including the
>>pin on the SA602 that is plugged in at the socket.  However, this path being
>>open should also have degraded band 2 reception as well as transmission,
>>though perhaps not asy markedly.
>>>
>>> Mike / KK5F
>>>
>>> -----Original Message-----
>>>> From: AF6NI<astro_crazy at hotmail.com>
>>>> Sent: Jun 9, 2012 2:05 PM
>>>> To: elecraft at mailman.qth.net
>>>> Subject: [Elecraft] K1 no power out B2
>>>>
>>>> I just completed assembling a K1. It works fine on receive and 
>>>> transmits properly on B1 but not on B2.
>>>>
>>>> I have two 2 band filter boards, a 40/20 that I've had for a while 
>>>> and a
>>>> 30/17 that I just built. Both work the same in the K1. I have full 
>>>> power on B1, but nothing on B2. The display shows 0.1 watts but my 
>>>> Elecraft W1 wattmeter shows no output. As I said above, receive seems 
>>>> OK on both B1 and B2.
>>>>
>>>> Any suggestions gratefully accepted!
>>>>
>>>> Thanks and 73.
>>>> Joe
>>>>
>>>> --
>>>> View this message in context: 
>>>> http://elecraft.365791.n2.nabble.com/K1-no-power-out-B2-tp7557347.htm
>>>> l Sent from the Elecraft mailing list archive at Nabble.com.
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