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ECN/30 - New UTC time

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Daniel Reynolds-2

ECN/30 - New UTC time

Just a reminder that the ECN/30 will be meeting Thursday at 8E/7C/6M/5P (0100
UTC Friday). I've moved to a later hour to accomodate for the later local
sunset (propagation). It will have the added advantage of allowing those who
live in the west to check in after they get home from work. We will try to keep
this 0100z time slot through the DST time shift this weekend - so next week, it
will be Thursday 9E/8C/7M/6P (0100 UTC Friday).

Due to the low power nature of the net (and net control), our frequency is
flexible. We will meet on 10.1x2.7 or 10.1x7.2 - depending on QRM. If we get
bumped off the frequency we started on, look for net control calling on
another.

Turn out has been pretty low for the last month. Hopefully with the later hour,
we'll have more folks check in.

73,
Daniel AA0NI
Oklahoma City
K2 #3421

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Andrew Moore-4

Looking for 40m RF amp design for my K2

I'm looking for designs for an RF amp for my K2. Can anyone point me to
a design? I plan to use it for CW only, 40 meters only, and roughly 75
watts output. Solid state preferred but not required. I'd like to keep
it external to my K2 so I can keep the K2 in its "QRP" flavor.

Thanks,
--Andrew, NV1B, CFO 963

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Mike W-12

Re: Looking for 40m RF amp design for my K2

http://www.communication-concepts.com/hf_amplifiers.htm
should be of some interest to you
--

On 30 Mar 2005 at 10:18, Andrew Moore wrote:

> I'm looking for designs for an RF amp for my K2. Can anyone point me
> to a design? I plan to use it for CW only, 40 meters only, and
> roughly 75 watts output. Solid state preferred but not required. I'd
> like to keep it external to my K2 so I can keep the K2 in its "QRP"
> flavor.
>
> Thanks,
> --Andrew, NV1B, CFO 963
>
>
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Tom McCulloch

Re: Looking for 40m RF amp design for my K2

In reply to this post by Andrew Moore-4

I was wondering of anyone has built the amp shown at the link below. It had my interest for a while until it's power requirements were pointed out to me as being a drawback, price-wise.

Tom
WB2QDG
K2 1103
-------------- Original message ----------------------
From: "Mike W" <[hidden email]>

> http://www.communication-concepts.com/hf_amplifiers.htm
> should be of some interest to you
> --
>
>
> On 30 Mar 2005 at 10:18, Andrew Moore wrote:
>
> > I'm looking for designs for an RF amp for my K2. Can anyone point me
> > to a design? I plan to use it for CW only, 40 meters only, and
> > roughly 75 watts output. Solid state preferred but not required. I'd
> > like to keep it external to my K2 so I can keep the K2 in its "QRP"
> > flavor.
> >
> > Thanks,
> > --Andrew, NV1B, CFO 963
> >
> >
> > _______________________________________________
> > Elecraft mailing list
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> >
> >
> >
> > --
> > No virus found in this incoming message.
> > Checked by AVG Anti-Virus.
> > Version: 7.0.308 / Virus Database: 266.8.6 - Release Date: 3/30/05
> >
>
>
>
>
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.308 / Virus Database: 266.8.6 - Release Date: 3/30/05
>
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zeke7237

Re: Looking for 40m RF amp design for my K2

In reply to this post by Andrew Moore-4

Look at the Class E designs .. cheap transistors, switching power
supplies, easy to build

de John/W1RT

On Wed, 30 Mar 2005 10:18:27 -0500, Andrew Moore <[hidden email]> wrote:

> I'm looking for designs for an RF amp for my K2. Can anyone point me to
> a design? I plan to use it for CW only, 40 meters only, and roughly 75
> watts output. Solid state preferred but not required. I'd like to keep
> it external to my K2 so I can keep the K2 in its "QRP" flavor.
>
> Thanks,
> --Andrew, NV1B, CFO 963
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
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G3VVT

Re: Looking for 40m RF amp design for my K2

In reply to this post by Andrew Moore-4

In a message dated 30/03/05 17:03:47 GMT Daylight Time, [hidden email] writes:

I was wondering of anyone has built the amp shown at the link below. It had
my interest for a while until it's power requirements were pointed out to me
as being a drawback, price-wise.

-------------------------------------------

Check Motorola designs AN762 and EB63 on the given website.

Both of these are designed to run from 12 to 14V DC at maybe something like
22A, so cannot understand the power supply problem. There are suitable power
supplies available relatively cheaply for this in abundance. Believe the
classic design AN762 which is the basis of the linear amplifier in most HF 100W
transmitters is featured in ARRL publications and is described in detail in the
RSGB Radio Communications handbook.

Bob, G3VVT
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S55M

Re: Looking for 40m RF amp design for my K2

In reply to this post by Mike W-12

Nice designs but i write to them couple of e-mails and they don't care at
all :(((
Maybe they dont trade outside USA????

----- Original Message -----
From: "Mike W" <[hidden email]>
To: "Andrew Moore" <[hidden email]>; <[hidden email]>
Sent: Wednesday, March 30, 2005 5:21 PM
Subject: Re: [Elecraft] Looking for 40m RF amp design for my K2

Michael Johansen

Re: Looking for 40m RF amp design for my K2

In reply to this post by Andrew Moore-4

Hi,

I bought a 180W version of the AN762 from
Communication Concepts for my K2. I also bought the
filter set for it. It works like a dream! I can now
easily disconnect my K2 from it and go QRP.

YES the company is a BIT slow on responding to
e-mails. So call them! Or FAX them! They are there and
yes they ship overseas. I live in Denmark. Now I also
bought the EB104 600W PA from them so that is the next
project.

If you only need ~75W then I would recommend the AN762
100W version. It is a bit better than the EB63 on its
biasing scheme.

But note that you ONLY get a PCB and components
(torroids pre-wound!) and a piece of paper saying
"Construction Hints". Then you are on your own. You
need to supply your own RTX-switch, filters, heat sink
etc.

Good luck!

73 de
Michael
OZ8AGB

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S55M

Re: Looking for 40m RF amp design for my K2

For test i sent them e-mail yesterday again and recieved an answer in 1 hour
(wow).
Maybe they read this reflector.
Did You purchased also the LP filters for the six bands?

Thanks for answer!

S55M-Adi
----- Original Message -----
From: "Michael Johansen" <[hidden email]>
To: <[hidden email]>
Sent: Thursday, March 31, 2005 11:53 AM
Subject: Re: [Elecraft] Looking for 40m RF amp design for my K2

> Hi,
>
> I bought a 180W version of the AN762 from
> Communication Concepts for my K2. I also bought the
> filter set for it. It works like a dream! I can now
> easily disconnect my K2 from it and go QRP.
>
> YES the company is a BIT slow on responding to
> e-mails. So call them! Or FAX them! They are there and
> yes they ship overseas. I live in Denmark. Now I also
> bought the EB104 600W PA from them so that is the next
> project.
>
> If you only need ~75W then I would recommend the AN762
> 100W version. It is a bit better than the EB63 on its
> biasing scheme.
>
> But note that you ONLY get a PCB and components
> (torroids pre-wound!) and a piece of paper saying
> "Construction Hints". Then you are on your own. You
> need to supply your own RTX-switch, filters, heat sink
> etc.
>
> Good luck!
>
> 73 de
> Michael
> OZ8AGB
>
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Andrew Moore-4

K2 tx align: power just keeps climing, no peak

I'm in the process of aligning the transmitter on my K2 #4778.

The manual says to peak pairs of slug tuned coils and variable
capacitors on the various bands, with the power control set to 2.0
watts.

There is no peak as I dial the slug tuned coils around -- just an
increased power in one direction, and decreased power in the other,
until the slug tuned coil either tops out or bottoms out. Even with the
control set to 2.0 watts, the indicated power (on the K2 internal power
meter) shows 7 watts and climbing.

Any ideas?

Also, my K2 keeps entering play/record message mode all on its own. I
think it's just a bad switch, or possibly a stray piece of solder or
other metal is shorting the control lines somewhere between the switch
and the inputs to the CPU. I'm not too worried about that one... should
be easy to trace. But the tx alignment problem has me puzzled.

Thanks for any suggestions,
--Andrew, NV1B

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Dan Barker

RE: K2 tx align: power just keeps climing, no peak

You have to leave tune mode, and reenter tune mode occasionally to get the
power to reset. I believe the book says 10 seconds for thermal reasons.

Anyhow, just iterate between the two, going against a stop if that's the
max, until you get the best you can get. It probably won't be against either
stop on either slug. It's the allowing the K2 to remeasure the power, and
iterating back and forth that get the mojo out of the screwdriver in inside
the K2 where it belongs.

Dan / WG4S / K2 #2456
<snip> with the control set to 2.0 watts, the indicated power (on the K2
internal power
meter) shows 7 watts and climbing.
</snip>

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Don Brown-4

Re: K2 tx align: power just keeps climing, no peak

Hi

Re-adjusting the power control knob a little will also make the K2
re-measure the power out. As you are adjusting the slug in the coil just
move the power control and the power will return back to the 2 watt level.
This is faster and easier than going out of then and back into tune.

Don Brown
KD5NDB

----- Original Message -----
From: "Dan Barker" <[hidden email]>
To: "Andrew Moore" <[hidden email]>; "Elecraft"
<[hidden email]>
Sent: Thursday, March 31, 2005 1:44 PM
Subject: RE: [Elecraft] K2 tx align: power just keeps climing, no peak

> You have to leave tune mode, and reenter tune mode occasionally to get the
> power to reset. I believe the book says 10 seconds for thermal reasons.
>
> Anyhow, just iterate between the two, going against a stop if that's the
> max, until you get the best you can get. It probably won't be against
> either
> stop on either slug. It's the allowing the K2 to remeasure the power, and
> iterating back and forth that get the mojo out of the screwdriver in
> inside
> the K2 where it belongs.
>
> Dan / WG4S / K2 #2456
> <snip> with the control set to 2.0 watts, the indicated power (on the K2
> internal power
> meter) shows 7 watts and climbing.
> </snip>
>

Don Wilhelm-3

RE: K2 tx align: power just keeps climing, no peak

In reply to this post by Andrew Moore-4

Andrew,

Most of the bandpass filters tune properly with the inductor slugs between 1
1/2 to 4 turns into the coil. If your adjustments are so far out of range
that the slugs are either at the top or bottomed out you have a problem.

The problem is either 1) The capacitors in the bandpass filter have
incorrect values, or 2) the frequency is not really what it is supposed to
be (VFO/Mixer problem).

If you were able to find a peak during the receive bandpass filter tuning,
the transmit tuning is only a refinement of that receiver tuning and you
should find the peak on transmit less than a half turn away.

73,
Don W3FPR

> -----Original Message-----
>
> I'm in the process of aligning the transmitter on my K2 #4778.
>
> The manual says to peak pairs of slug tuned coils and variable
> capacitors on the various bands, with the power control set to 2.0
> watts.
>
> There is no peak as I dial the slug tuned coils around -- just an
> increased power in one direction, and decreased power in the other,
> until the slug tuned coil either tops out or bottoms out. Even with the
> control set to 2.0 watts, the indicated power (on the K2 internal power
> meter) shows 7 watts and climbing.
>
> Any ideas?
>
>

Andrew Moore-4

RE: K2 tx align: fixed!

Thanks List -- tx successfully aligned.

Proceeding with final assembly.

--Andrew

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