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K1 no power out B2

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AF6NI

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

Mike Morrow-3

Re: K1 no power out B2

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.html
>Sent from the Elecraft mailing list archive at Nabble.com.
>______________________________________________________________
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Mike Morrow-3

Re: K1 no power out B2

In reply to this post by AF6NI

I wrote:

> ...including the pin on the SA602 that is plugged in at the socket.

Ignore that part...U7 is soldered in...there is no socket.

Mike / KK5F

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"Hjalmar Duklæt"

Re: K1 no power out B2

In reply to this post by Mike Morrow-3

AF6NI

Re: K1 no power out B2

In reply to this post by AF6NI

Hal my issue is the same whether I have the 40/20 or 30/17 board installed so it would need to be two crystals - one on each board. I guess that's possible.

I have another k1 with a 4 band board, but I'm hesitant to put that board in because I think its also possible that something on the rf board is frying a component on the filter board.

73
Joe

Hjalmar Duklæt <[hidden email]> wrote:

I just had the same problem. It turned out to be the 22MHz crystal on the pre-mixer bandpass filter. Changed the crystal and that was that.
73 de Hal/LA4XX

On 12-06-09, 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.html
>Sent from the Elecraft mailing list archive at Nabble.com.
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
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AF6NI

Re: K1 no power out B2

In reply to this post by AF6NI

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-----

Kent Tiburski

KPA500 Issues

In reply to this post by AF6NI

Hi,

I have a KPA500 amp and have some issues with it. I ran on my Cushraft R-8 vertical with fault (SWR) problems. I went to use it on the VHF contest with my meager 3 element yagi and it faults out? Hunhh? Checked the VSWR with a meter and my antenna analyzer and it shows a 1.2 to 1 ratio. OK I thought there was feedback so I put a bunch of ferrite cores and even wrapped 8 turns on the coax (balun) to no avail. What gives? This was mainly on 6 meters but to some extent on other bands also. Checked VSWR with a meter on radio (FLEX 5000A). I think it's in KPA500 circuit. Any ideas? I'm a newbie here so not familiar with what's been discussed. Thanks.

73, Kent, K6FQ

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Gary Hinson

Re: KPA500 Issues

Hi Kent.

It could be an RFI issue but it could also be a faulty connection somewhere
that won't pass enough current for high power.

Do the KPS's SWR LEDs light up like a Christmas tree when you operate
barefoot at about 100W with the KPA in standby? If so, you clearly have a
problem with your antenna or feed.

With the KPA in operate mode, watch those SWR LEDs as you gradually increase
the drive from 5 to 25W: if it seems OK at the low end but suddenly flashes
the oranges/reds and faults out, I'd suspect a dodgy connector, most likely
one outside that has corroded or loosened.

73
Gary ZL2iFB
K2 K3 KPA500 W2 Mojo

PS You can search the archives for lots more through Nabble e.g.
http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=search_p
age&node=365791&query=kpa+swr

> -----Original Message-----
> From: [hidden email] [mailto:elecraft-
> [hidden email]] On Behalf Of Kent Tiburski
> Sent: Sunday, 10 June 2012 1:33 p.m.
> To: [hidden email]
> Subject: [Elecraft] KPA500 Issues
>
> Hi,
>
> I have a KPA500 amp and have some issues with it. I ran on my Cushraft

R-8
> vertical with fault (SWR) problems. I went to use it on the VHF contest
with
> my meager 3 element yagi and it faults out? Hunhh? Checked the VSWR
> with a meter and my antenna analyzer and it shows a 1.2 to 1 ratio. OK I
> thought there was feedback so I put a bunch of ferrite cores and even
> wrapped 8 turns on the coax (balun) to no avail. What gives? This was
mainly
> on 6 meters but to some extent on other bands also. Checked VSWR with a
> meter on radio (FLEX 5000A). I think it's in KPA500 circuit. Any ideas?
I'm a

> newbie here so not familiar with what's been discussed. Thanks.
>
> 73, Kent, K6FQ
>
> __________________________________________________________
> ____
> Elecraft mailing list
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Don Wilhelm-4

Re: K1 no power out B2

In reply to this post by AF6NI

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.html
>> Sent from the Elecraft mailing list archive at Nabble.com.
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>

Mike Morrow-3

Re: K1 no power out B2

In reply to this post by AF6NI

> As the prior poster has suggested, the RF board path from from P1 pin 2
> to U7 pin 4 is suspect...

Not really. That's the band 1 path, for which satisfactory performance was reported.

> ...as is the path between P1 pin 1 ans U7 pin 5.

Which, assuming the fault does not stem from the same unlikely pathology on both filter boards, still seems most probable (although P1 is on the KFL1-2, so J6 on the RF board is more accurate).

You could substitute the KFL1-4 from your other K1 to see if this or related problems show up. The four-band board couples the pre-mixer tuning circuit differently than does the two-band board, using U7 output from *both* pin 4 and 5 together on all four bands. A problem with the U7 pin 5 path on the K1 could show up on all four bands rather than just band 2.

I would not worry about the K1 zapping the KFL1-4. The MCU is the only chip and it is obviously working on all your KFLs.

Mike / KK5F

I would not worry about anything coming from the K1 zapping anything on a filter board. The filter board

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AF6NI

Re: K1 no power out B2

In reply to this post by AF6NI

Thanks all. I checked all solder joints and components in the pre-mixer and reflowed solder on U7. Still the same. I'll try the 4 band board tomorrow.
Joe

Don Wilhelm <[hidden email]> wrote:

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:

Dave Johnson

Re: KPA500 Issues

In reply to this post by Kent Tiburski

What does it do into a 50 Ohm load?

The KPA500 will play up if you have an SWR of 2:1, or higher, when
running near full power.

Also, your posting had no line feeds/carriage returns making reading
it hard work.

73 Dave, G4AON

>I have a KPA500 amp and have some issues with it. I ran on my Cushraft R-8 vertical with fault (SWR) problems. I went to use it >on the VHF contest with my meager 3 element yagi and it faults out?
>
>73, Kent, K6FQ
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WB4SON

Re: KPA500 Issues

In reply to this post by Kent Tiburski

The R-8 is a radial-less vertical. Unfortunately it has a tendency to put
all sorts of RF down the coax as the "counterpoise" system is too short
given the wavelengths involved.

You might want to buy a heavy-duty coaxial choke from DX-Engineering like
the

http://www.dxengineering.com/Parts.asp?ID=1474&PLID=166&SecID=81&DeptID={112450B5-E9E3-4F36-9166-E52FA128D019}&PartNo=DXE%2DFCC050%2DH05%2DA<http://www.dxengineering.com/Parts.asp?ID=1474&PLID=166&SecID=81&DeptID=%7B112450B5-E9E3-4F36-9166-E52FA128D019%7D&PartNo=DXE%2DFCC050%2DH05%2DA>

I used a R8 for years and had trouble even with 100 watts of power. I
can't imagine how bad it would be at 500 watts. Your station ground is
going to have to be top notch if you want to avoid trouble.

Good luck!

73, Bob, WB4SON
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73, Bob, WB4SON

Kent Tiburski

Re: KPA500 Issues

Thanks Bob!

I actually did that and added those snap-on ferrite cores. I cleaned up
things a lot! I'm starting to think that there may be other things going
on. I took the advice of others that replied. Things such as using a dummy
load, no problems. I put the amp in STBY and when running 100 watts thru it
the VSWR was less than 1.5 to 1 and forward power was 100 watts (indicated
on the amp). I put the dummy load on the other end of my run of coax and it
was fine. Even with the extra balun and ferrite cores me thinks that it's
either the length of the coax or I have the antennas too close to the shack.
My 6 meter yagi is laterally about 30 feet from the rig/amp and the R8 about
36 feet.

Anyone else have any ideas? Thanks!

73, Kent, K6FQ

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Bob
Sent: Sunday, June 10, 2012 10:59 AM
To: [hidden email]
Subject: Re: [Elecraft] KPA500 Issues

The R-8 is a radial-less vertical. Unfortunately it has a tendency to put
all sorts of RF down the coax as the "counterpoise" system is too short
given the wavelengths involved.

You might want to buy a heavy-duty coaxial choke from DX-Engineering like
the

http://www.dxengineering.com/Parts.asp?ID=1474&PLID=166&SecID=81&DeptID={112
450B5-E9E3-4F36-9166-E52FA128D019}&PartNo=DXE%2DFCC050%2DH05%2DA<http://www.
dxengineering.com/Parts.asp?ID=1474&PLID=166&SecID=81&DeptID=%7B112450B5-E9E
3-4F36-9166-E52FA128D019%7D&PartNo=DXE%2DFCC050%2DH05%2DA>

I used a R8 for years and had trouble even with 100 watts of power. I can't
imagine how bad it would be at 500 watts. Your station ground is going to
have to be top notch if you want to avoid trouble.

Good luck!

73, Bob, WB4SON
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Rick WA6NHC

Re: KPA500 Issues

I came in late so may have missed a point or two.

The R8 is an end fed half wave vertical and the 'matching box' includes a
common mode choke. It has a very low angle of radiation. If it is on the
same vertical plane as your station, the antenna will 'hose' it with RF
(have that situation here, so I'm waiting for the KAT500 to heat up the
dipole; it's 50' away). Placing the R8 directly above your station puts you
in a null, which may give enough lower signal strength to keep things
content and the added height won't hurt either.

This presumes that the 'matching box' contents are still effective as the
ferrite has been known to crack. It is time to pop open the side of the
black box and see how it looks inside (spider webs arcing, wires
burned/intact etc.). I'd look for a cracked ferrite, which may show good
SWR at low power, yet when it gets RF hot may do something completely
sideways.

What happens when you turn the Yagi away from your station (most nulls will
be ~45 deg off of the rear)?

When you add ferrites to the cables in the shack, don't forget that RF can
enter at ANY point; audio, USB/serial etc); filter everything.

73,

Rick wa6nhc

-----Original Message-----
From: Kent Tiburski

Thanks Bob!

I actually did that and added those snap-on ferrite cores. I cleaned up

things a lot! I'm starting to think that there may be other things going

on. I took the advice of others that replied. Things such as using a dummy

load, no problems. I put the amp in STBY and when running 100 watts thru it

the VSWR was less than 1.5 to 1 and forward power was 100 watts (indicated

on the amp). I put the dummy load on the other end of my run of coax and it

was fine. Even with the extra balun and ferrite cores me thinks that it's

either the length of the coax or I have the antennas too close to the shack.

My 6 meter yagi is laterally about 30 feet from the rig/amp and the R8 about

36 feet.

Anyone else have any ideas? Thanks!

73, Kent, K6FQ

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Kent Tiburski

Re: KPA500 Issues

In reply to this post by Kent Tiburski

Hi guys!

Seems I found the solution to my problem. I put ferrite cores next to the
amp AND I forgot the PTT line so that was added. Added one to the AC line,
there's two now. Now I'm able to get acceptable VSWR and run 350 watts out.
I never really thought that it was the amp's fault but my installation.
That's good cuz 6 meter prop is in so I'll work a few more Q's today!

I suppose that there is a lesson learned here, ISOLATE your installation
either by distance and/or add ferrite. I was pretty suspect that the
problem was the close proximity to the antennas. FYI, but thanks to all for
your technical support! It wasn't the product, it was the guy (that would
be me) and my installation that was the culprit.

Having said that, does the 500 maybe need a little more RF hardening? Not
a EE major, just asking the question.

73, Kent, K6FQ

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Kent Tiburski
Sent: Sunday, June 10, 2012 11:28 AM
To: 'Bob'; [hidden email]
Subject: Re: [Elecraft] KPA500 Issues

Thanks Bob!

I actually did that and added those snap-on ferrite cores. I cleaned up
things a lot! I'm starting to think that there may be other things going
on. I took the advice of others that replied. Things such as using a dummy
load, no problems. I put the amp in STBY and when running 100 watts thru it
the VSWR was less than 1.5 to 1 and forward power was 100 watts (indicated
on the amp). I put the dummy load on the other end of my run of coax and it
was fine. Even with the extra balun and ferrite cores me thinks that it's
either the length of the coax or I have the antennas too close to the shack.
My 6 meter yagi is laterally about 30 feet from the rig/amp and the R8 about
36 feet.

Anyone else have any ideas? Thanks!

73, Kent, K6FQ

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Bob
Sent: Sunday, June 10, 2012 10:59 AM
To: [hidden email]
Subject: Re: [Elecraft] KPA500 Issues

The R-8 is a radial-less vertical. Unfortunately it has a tendency to put
all sorts of RF down the coax as the "counterpoise" system is too short
given the wavelengths involved.

You might want to buy a heavy-duty coaxial choke from DX-Engineering like
the

http://www.dxengineering.com/Parts.asp?ID=1474&PLID=166&SecID=81&DeptID={112
450B5-E9E3-4F36-9166-E52FA128D019}&PartNo=DXE%2DFCC050%2DH05%2DA<http://www.
dxengineering.com/Parts.asp?ID=1474&PLID=166&SecID=81&DeptID=%7B112450B5-E9E
3-4F36-9166-E52FA128D019%7D&PartNo=DXE%2DFCC050%2DH05%2DA>

I used a R8 for years and had trouble even with 100 watts of power. I can't
imagine how bad it would be at 500 watts. Your station ground is going to
have to be top notch if you want to avoid trouble.

Good luck!

73, Bob, WB4SON
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AF6NI

Re: KPA500 Issues

Why are all of these KPA500 issue messages linked to the thread I started on a K1 power issue in nabble?

AF6NI

Re: KPA500 Issues

In reply to this post by Kent Tiburski

hmmm i guess that makes sense. Thanks.

Ron D'Eau Claire <[hidden email]> wrote:

>Commonly known as "thread drift"; someone changed the subject line of one of
>posts to the original thread and asked a new question -- taking care to
>change the subject per Eric's list guidelines.
>
>Ron AC7AC
>
>-----Original Message-----
>
>Why are all of these KPA500 issue messages linked to the thread I started on
>a K1 power issue in nabble?
>
>--
>

AF6NI

Re: K1 no power out B2

In reply to this post by Don Wilhelm-4

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.
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html
>

Mike Morrow-3

Re: K1 no power out B2

In reply to this post by AF6NI

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.
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net Please help support this
>>> email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this email
>> list: http://www.qsl.net/donate.html
>>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html