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K1 no power out B2

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Mike Morrow-3

Re: K1 no power out B2

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 <[hidden email]>
>Sent: Jun 11, 2012 8:44 PM
>To: Joe McGerald <[hidden email]>
>Cc: [hidden email]
>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 <[hidden email]>
>>Sent: Jun 11, 2012 6:59 PM
>>To: [hidden email]
>>Cc: [hidden email]
>>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:[hidden email]]
>>Sent: Saturday, June 09, 2012 7:28 PM
>>To: Joe McGerald
>>Cc: [hidden email]
>>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<[hidden email]> 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<[hidden email]>
>>>> Sent: Jun 9, 2012 2:05 PM
>>>> To: [hidden email]
>>>> 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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>>
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AF6NI

Re: K1 no power out B2

In reply to this post by AF6NI

Hey Mike, thanks for all your suggestions! I reflowed the solder on K3, l11 and l12 on the 40/20 board and I now have 20 meters!

So I need to look carefully at the 30/17 board now.

What really threw me was that both boards had the same symptoms.

Thanks.
Joe

Mike Morrow <[hidden email]> wrote:

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-----

Mike Morrow-3

Re: K1 no power out B2

In reply to this post by AF6NI

> I reflowed the solder on K3, l11 and l12 on the 40/20 board
> and I now have 20 meters!
>
> So I need to look carefully at the 30/17 board now.

Good progress, Joe.

At least you didn't fall into the trap of thinking that when the filter board coils had been peaked for receive that there was no need to again adjust them during transmitter alignment. That was a common error in the K1 early days, especially if the builder had used (unnecessarily IMO) Spectrogram to align the receiver...that seemed to create a reluctance to alter the coil adjustments during the transmitter alignment. The result then was always similar...no transmitter output.

I love my 12-year-old K1 sn 175. I've had it on 15m for several weeks continuously, with only 15 feet of hook-up wire as an indoor antenna (receive only). It still fascinates me to hear JAs and ZLs on the K1 at mid-night local cdt.

Mike / KK5F

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AF6NI

Re: K1 no power out B2

In reply to this post by AF6NI

They sure are fun. I've had a couple but this is the 1st I've built.
Thanks again.
Joe

PS just had my first QSO with it, and it was on 20m.

Mike Morrow <[hidden email]> wrote:

>> I reflowed the solder on K3, l11 and l12 on the 40/20 board
>> and I now have 20 meters!
>>
>> So I need to look carefully at the 30/17 board now.
>
>Good progress, Joe.
>
>At least you didn't fall into the trap of thinking that when the filter board coils had been peaked for receive that there was no need to again adjust them during transmitter alignment. That was a common error in the K1 early days, especially if the builder had used (unnecessarily IMO) Spectrogram to align the receiver...that seemed to create a reluctance to alter the coil adjustments during the transmitter alignment. The result then was always similar...no transmitter output.
>
>I love my 12-year-old K1 sn 175. I've had it on 15m for several weeks continuously, with only 15 feet of hook-up wire as an indoor antenna (receive only). It still fascinates me to hear JAs and ZLs on the K1 at mid-night local cdt.
>
>Mike / KK5F
>
>