Re: [Elecraft] Power control on 50MHz

[Ian White GM3SEK]

Wayne wrote:
>
>We switch the KPA3 out at lower power levels to optimize the drive, 
>ensuring a high carrier-to-noise ratio at lower-level stages.
>
>In any case, IMD should be quite respectable on 6 m even with the LPA 
>by itself.

Understood; but the simple term "IMD" covers a wide range of issues. It 
isn't all about 3rd order IMD; the overall width of the signal is 
determined by how rapidly the higher orders die away.

Comparing the LPA near its maximum output and the HPA near its minimum 
(say 11W versus 15W) the LPA gives more 3rd-order IMD, but the 
higher-order IMD products taper away more quickly so the signal overall 
is narrower.

There is also the issue of cooling; for example, with intensive RTTY or 
WSJT modes, 10W output would be pushing the passively cooled LPA close 
to its thermal limits. In such a case, it would be better to switch in 
the HPA so that both amplifiers are operating well within their thermal 
limits.

The best solution to meet the wide range of possible user needs would be 
a configurable breakpoint between the LPA and the HPA. If the breakpoint 
could be adjusted between say 6W and 12W (configurable and stored per 
band), that would cover a wide range of practical user needs without 
affecting the SNR of the transmitted signal by more than 3dB.

Then there is W7GJ's point about the gap in available power output on 
50MHz:
>As solid state amps become more prevalent, more folks will be wanting 
>to be able to adjust the power in that range to make sure they do not 
>overdrive their amplifiers.

As well as the wide range of possible power amplifiers, there is also a 
wide range of legal power limits around the world. With my particular 
50MHz PA, the gap in drive level available from the K3 makes it 
impossible to set the PA output to our 400W legal limit - the level 
jumps from 290W to 470W.

It is truly bizarre that output levels between 8W and 13W are not 
available on 50MHz. This issue is as old as the K3 itself, and it really 
does need to be fixed!

However, a complete solution would also include the configurable 
breakpoint between the LPA and the HPA as identified above.



-- 

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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Re: [Elecraft] [K3] - Odd SWR readings ANT1 v ANT2

[GW0ETF]

Thanks for the explanation Joe - that makes sense now and indeed after doing
as you suggest all is 'normal'. 
The "soft" bypass concept isn't what I'd call intuitive so my only
suggestion would be an explanatory footnote to this effect in the manual,
always assuming I haven't missed it

Who says you can't teach an old dog new tricks?

73 and thanks,

Stewart, GW0ETF (Original owner of K3 #145)


Joe Subich, W4TV-4 wrote:
> 
> 
> Stewart,
> 
> The K3ANT does not do a "hard" bypass.  Instead it sets the
> tuner to the memorized 50 Ohm : 50 Ohm position.
> 
> Since the tuner memories are "by band" and "by antenna" - plug
> the dummy load into the ANT 1 position, enable the tuner and
> hit the "ATU Tune" button.  That will "teach" the tuner the 50
> Ohm setting for ANT 1 and you won't see the issue in the future.
> 
> 73,
> 
> ... Joe, W4TV
> 
> On 6/11/2010 2:14 PM, Stewart Rolfe wrote:
>> No doubt the recent Es propagation has brought the following
>> behaviour to my attention...it's only evident on 10m for some
>> reason:- Screw in a PL259 type dummy load into ANT1 (KAT3) and
>> deselect ATU. Press TUNE (10w) and the indicated swr on the K3 is 1.7
>> to 1.8. Change dummy load to ANT2 and select and the indicated swr is
>> now 1.0...! I've swapped the antenna leads on the KAT3 board to
>> determine it's something to do with circuitry around the antenna
>> relay and not PL259 sockets/interconnecting leads but according to
>> the schematics each path is equivalent. Furthermore an external swr
>> meter placed between dummy load and K3 indicates 1:1 on *both* ANT 1
>> and 2 so it seems to be  something to do with the way the radio is
>> sensing the swr between the two antenna sockets. I'm not at all hung
>> up on swr but why the difference between the 2 antenna inputs -
>> strays in the relay or surge arrestors? It also looks like the radio
>> is 'thinking' about the power output when the swr indicates 1:1.8 and
>> above and may cause power variations? Thoughts?? 73, Stewart
>> Rolfe, GW0ETF (K3 #145)
>> __
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[Elecraft] WB3AAL on the AT

[Ron Polityka]

Hi,

 Going out onto the Appalachian Trail now. I should be on 
the
air between 11:30 and 12:30 UTC depend on where I can find 
an operating spot on the AT. There is a lot of thru hikers 
making their way up to Maine and I do not want to crowd them 
on their trip.

Rig will be the Elecraft K1 @ 5w into a portable vertical.

I will be on or around the following freq.:

7030 / 7040 / 10116 / 14060 and I will give a couple of
calls on 21060 around 15:00 UTC.

I see we have a M Class Flare that will produce some minor 
radio blackouts. Not sure which band I will start out on so 
if you hear me or work me on HF CW please spot me on the 
list.

We are expecting some afternoon storms so I might not be out 
after 16:00 or 17:00 UTC at the latest.

I will be working on my 1,180 QSO's from the Appalachian 
Trail. Still need MT and HI for WAS from the AT.

72 and Thanks,
Ron de WB3AAL

K1 - SN 01011
K2 - SN 01392


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Re: [Elecraft] MMTTY FSK

[Mike]

Fair enough.

Mike NF4L

Brett Howard wrote:
> I'm one of those guys that is a glutton for punishment...  To me the
> fact that FSK is more complicated and I've not done it before is the
> actual advantage.  I do see FSK as a method that is slightly less prone
> to TX distortions.  I built my interface using opto couplers and then
> put in a few jumpers to allow for several grounding situations.  Turned
> out that 100% disconnect between all grounds is working very well.
>
> ~Brett (N7MG)
>
> On Fri, 2010-06-11 at 19:28 -0400, Mike wrote:
>   
>> When I got my K3, I was hot to get it set up on FSK. Somebody here 
>> convinced me to try AFSK, and I was blown away by how simple it is, and 
>> less complicated to set up. AFAICT, FSK offers no advantage.
>>
>> 73, Mike NF4L
>>
>> Brett Howard wrote:
>> 
>>> Ok so I've never done RTTY via true FSK only audio modes...  I have to
>>> put in a fence this weekend so I won't be able to play this weekend but
>>> I'm trying to get ready for FD...  
>>>
>>> So I've made an interface that consists of a couple opto couplers (one
>>> for FSK and one for PTT)...  I've got the radio all setup and shorting
>>> the FSK_IN pin to GND makes the radio switch tones as it should...
>>>
>>> However I'm having issues getting MMTTY to open the COM port.  I'm using
>>> an FTDI based USB->RS232 converter.  The MMTTY settings have the USB
>>> button right there and they tell me to click on the last 3 options.
>>> I've tried all 3 but in all 3 modes I get the unable to open COM3
>>> error...
>>>
>>> I'm going to be googling and seeing if anyone else has had this issue
>>> with me but I figured I'd pose here in the event someone here has
>>> already run into this issue.
>>>
>>> ~Brett (N7MG)
>>>
>>> __
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>>>
>>>   
>>>   
>> 
>
>
>
>   


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Re: [Elecraft] MMTTY FSK

[Richard Ferch]

Brett Howard wrote:
 > I do see FSK as a method that is slightly less prone
 > to TX distortions.

You might be surprised. In my setup I can switch back and forth 
instantly between FSK and AFSK. I have done some testing with a second 
receiver, and my K3's RTTY signal seems to be cleaner in AFSK than FSK 
(lower odd-order sidebands). My guess is that this is due to keying 
transients in FSK. I assume the AFSK from MMTTY uses some form of 
waveform shaping or phase-coherent transitions between the two tones, 
resulting in lower keying transients.

73,
Rich VE3KI
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Re: [Elecraft] MMTTY FSK

[Bob Naumann]

Where did the idea that FSK is more difficult come from?

FSK requires no setting of transmit audio levels or concerns about sound
card settings - for transmission.

To me, this cuts the difficulty in half.

Using a RigExpert or MicroHam (or their equivalent) Interface it's basically
automatic and requires no fiddling with levels.

100% FSK RTTY here. Zero problems.

73,

Bob W5OV

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mike
Sent: Saturday, June 12, 2010 6:37 AM
To: Brett Howard
Cc: elecraft
Subject: Re: [Elecraft] MMTTY FSK

Fair enough.

Mike NF4L

Brett Howard wrote:
> I'm one of those guys that is a glutton for punishment...  To me the
> fact that FSK is more complicated and I've not done it before is the
> actual advantage.  I do see FSK as a method that is slightly less prone
> to TX distortions.  I built my interface using opto couplers and then
> put in a few jumpers to allow for several grounding situations.  Turned
> out that 100% disconnect between all grounds is working very well.
>
> ~Brett (N7MG)
>
> On Fri, 2010-06-11 at 19:28 -0400, Mike wrote:
>   
>> When I got my K3, I was hot to get it set up on FSK. Somebody here 
>> convinced me to try AFSK, and I was blown away by how simple it is, and 
>> less complicated to set up. AFAICT, FSK offers no advantage.
>>
>> 73, Mike NF4L
>>
>> Brett Howard wrote:
>> 
>>> Ok so I've never done RTTY via true FSK only audio modes...  I have to
>>> put in a fence this weekend so I won't be able to play this weekend but
>>> I'm trying to get ready for FD...  
>>>
>>> So I've made an interface that consists of a couple opto couplers (one
>>> for FSK and one for PTT)...  I've got the radio all setup and shorting
>>> the FSK_IN pin to GND makes the radio switch tones as it should...
>>>
>>> However I'm having issues getting MMTTY to open the COM port.  I'm using
>>> an FTDI based USB->RS232 converter.  The MMTTY settings have the USB
>>> button right there and they tell me to click on the last 3 options.
>>> I've tried all 3 but in all 3 modes I get the unable to open COM3
>>> error...
>>>
>>> I'm going to be googling and seeing if anyone else has had this issue
>>> with me but I figured I'd pose here in the event someone here has
>>> already run into this issue.
>>>
>>> ~Brett (N7MG)
>>>
>>> __
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
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>>> This list hosted by: http://www.qsl.net
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>>>
>>>   
>>>   
>> 
>
>
>
>   


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[Elecraft] CW Keys

[Phil LaMarche]

For Sale:

Vibroplex Brass Racer (Very Nice) $70.00 + $ 6 dollars S&H.

Vibroplex Bug 1940'S Clean, Great Action very Smooth $ 75.00 + $10 S&H .

COLLECTORS ITEM : MC ELROY DELUXE MODEL 1938 B Ser# 1026, SMOOTH AS 

SILK ACTION, VERY CLEAN 2 Small chips on the T-Bar about 1/8 and 1/16 inch
in diameter

Pictures upon request PRICE $ 400.00 Shipped

Phil

 
Philip LaMarche
 
LaMarche Enterprises, Inc
p...@lamarcheenterprises.com
www.LaMarcheEnterprises.com   
 
727-944-3226
727-937-8834 Fax
727-510-5038 Cell 
 
www.w9dvm.com  
 
K3 #1605
 
CCA 98-00827
CRA 1701
W9DVM
 
 
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Re: [Elecraft] MMTTY FSK

[Lyle Johnson]

> ...In my setup I can switch back and forth 
> instantly between FSK and AFSK. I have done some testing with a second 
> receiver, and my K3's RTTY signal seems to be cleaner in AFSK than FSK 
> (lower odd-order sidebands).

The K3 uses continuous-phase switching between the IF (and AF monitor) 
tones, but no shaping, in FSK.  The Tx signal passes through the 2.7 (or 
2.8) kHz IF filter, of course.

During AFSK operation, the audio passes through some AF filtering as 
well as IF filtering.

The K3 also has an AFSK Tx Filter that can optionally be switched in 
(CONFIG:AFSK TX FIL ON|OFF, default is OFF) which provides a much 
narrower AF filter centered on the RTTY tones (using the FSK PITCH 
control).  If you choose to use this filter, be sure your software is 
set up in a fixed pitch mode, and not "click the waterfall" or "AFC ON" 
where your Tx tones could be anywhere in the wider audio passband as 
defined by the waterfall display.

73,

Lyle KK7P




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[Elecraft] K3 SSB Tx Audio

[4Z5TO]

I haven't had the time lately to get on the air in the last several months,
but over the last couple of days I had a free hour here and there; I've
received exceptional audio reports. People have told me my sound and signal
are on par with local broadcast stations.

Hope that gives some some doubters a bit of hope if you want to use the K3
for SSB.

73,
4Z5TO



-
You're gonna have to answer to the Coca-Cola company.

http://www.iarc.org/~4z5to
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Re: [Elecraft] MMTTY FSK

[Brett Howard]

Its not more difficult just more fun cause I got to pull out the screwdriver
and soldering iron. That and it was harder for me cause that method I'd not
used before. I like using fsk and made a few contacts with it last night so
I can now say Ive make both ways work successfully.

~Brett (N7MG)

On Jun 12, 2010 5:14 AM, "Bob Naumann"  wrote:
Where did the idea that FSK is more difficult come from?

FSK requires no setting of transmit audio levels or concerns about sound
card settings - for transmission.

To me, this cuts the difficulty in half.

Using a RigExpert or MicroHam (or their equivalent) Interface it's basically
automatic and requires no fiddling with levels.

100% FSK RTTY here. Zero problems.

73,

Bob W5OV


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman
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Re: [Elecraft] [K3] - Odd SWR readings ANT1 v ANT2

[Guy Olinger K2AV]

No argument with what you are saying, Joe, just a curiosity...

>> The K3ANT does not do a "hard" bypass.  Instead it sets the
>> tuner to the memorized 50 Ohm : 50 Ohm position.
>>
>> Since the tuner memories are "by band" and "by antenna" - plug
>> the dummy load into the ANT 1 position, enable the tuner and
>> hit the "ATU Tune" button.  That will "teach" the tuner the 50
>> Ohm setting for ANT 1 and you won't see the issue in the future.
>>     ... Joe, W4TV

What do you do to tell the K3 that this is the dummy load 50 ohm to
use for the bypass setting?  Or does the K3 already know that.  And if
it does, how did it know that?

73, Guy.
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[Elecraft] [K2} #6952

[John Fritze]

Well after a bit, K2 #6952 is alive!  Seems I had 1 diode in backwards
which took out the finals.  So after several e-mails with Don W3FPR we
located the problem and all is now well.  In my defence however,
after I pulled it, the silk screen was a little ragged on the non
banded end, making it difficult to really tell which orientation was
correct.  Many thanks to Don for sticking with me as I sorted this
out.  Now on to the options!

Gee, I didn't even know my K3 was pregnant ;-)

John
K2QY
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Re: [Elecraft] [K3] - Odd SWR readings ANT1 v ANT2

[Joe Subich, W4TV]

Guy,

I don't know how it works.  All I know is that's the procedure
that Elecraft have recommended to others for the same "problem"
and it appears to work.

73,

... Joe, W4TV

On 6/12/2010 10:41 AM, Guy Olinger K2AV wrote:
> No argument with what you are saying, Joe, just a curiosity...
>
>>> The K3ANT does not do a "hard" bypass.  Instead it sets the
>>> tuner to the memorized 50 Ohm : 50 Ohm position.
>>>
>>> Since the tuner memories are "by band" and "by antenna" - plug
>>> the dummy load into the ANT 1 position, enable the tuner and
>>> hit the "ATU Tune" button.  That will "teach" the tuner the 50
>>> Ohm setting for ANT 1 and you won't see the issue in the future.
>>>  ... Joe, W4TV
>
> What do you do to tell the K3 that this is the dummy load 50 ohm to
> use for the bypass setting?  Or does the K3 already know that.  And if
> it does, how did it know that?
>
> 73, Guy.
>
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[Elecraft] Quick question K3

[Phil LaMarche]

Getting ready for the contest.  When I transmit on 6 at 92 watts and SWR of
1.7, the power shuts down after 30 seconds of transmitting.  Re-transmitt
and it's OK for another 30 seconds. ???
 
Phil
 
Philip LaMarche
 
LaMarche Enterprises, Inc
p...@lamarcheenterprises.com
www.LaMarcheEnterprises.com   
 
727-944-3226
727-937-8834 Fax
727-510-5038 Cell 
 
www.w9dvm.com  
 
K3 #1605
 
CCA 98-00827
CRA 1701
W9DVM
 
 
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Re: [Elecraft] MMTTY FSK

[Kok Chen]

On Jun 12, 2010, at 6/125:09 AM, Richard Ferch wrote:

> Brett Howard wrote:
>> I do see FSK as a method that is slightly less prone
>> to TX distortions.
>
> I have done some testing with a second
> receiver, and my K3's RTTY signal seems to be cleaner in AFSK than FSK
> (lower odd-order sidebands).

That is indeed correct.  AFSK can potentially produce cleaner signals  
than FSK, as long the transmit IMD is good.  Take a look at the last  
two figures on this page:

http://homepage.mac.com/chen/Technical/K3/Digital/digital.html

cocoaModem applies a filter to reduce the keying sidebands.  Except  
for having two tones, the result is similar to what Alex VE3NEA had  
described in his CW keying experiments article in QEX a couple of  
years ago.

The difference between FSK and AFSK can be even greater than what I'd  
measured if the K3 transmitter were cleaner.  Waveshaping the keying  
signal created albeit small, temporal overlap between the two RTTY  
tones, whereas an unwaveshaped FSK signal has no overlap and can be  
used even with class C amplifiers.

You can indeed see the low level IMD spikes from the in the last  
screen capture.

73
Chen, W7AY


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Re: [Elecraft] Quick question K3

[Steve Ellington]

What mode? FSK? Is you power supply shutting down and not the K3? What's the 
Power supplies rating?

Steve
N4LQ
- Original Message - 
From: "Phil LaMarche" 
To: 
Sent: Saturday, June 12, 2010 12:03 PM
Subject: [Elecraft] Quick question K3


> Getting ready for the contest.  When I transmit on 6 at 92 watts and SWR 
> of
> 1.7, the power shuts down after 30 seconds of transmitting.  Re-transmitt
> and it's OK for another 30 seconds. ???
>
> Phil
>
> Philip LaMarche
>
> LaMarche Enterprises, Inc
> p...@lamarcheenterprises.com
> www.LaMarcheEnterprises.com 
>
> 727-944-3226
> 727-937-8834 Fax
> 727-510-5038 Cell
>
> www.w9dvm.com 
>
> K3 #1605
>
> CCA 98-00827
> CRA 1701
> W9DVM
>
>
> __
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Re: [Elecraft] K3 SSB Tx Audio

[Hector Padron]

Nobody  of us the users has said that the K3 has a bad TX audio,this radio can 
sound as well as any other radio in the world,in fact it can sound even better 
if you know how to set properly the TX EQ,the mic and comp gain; as you after 
been using for more than a year my K3,  I keep receiving all the time excellent 
reports of my TX audio even I use all the time ESSB and I know lots of users 
don't like that mode.
I am using the Yamaha CM-500 as mic and if you are interested I can send you 
some clips to let you hear how I sound with it.Good luck with yours,73
 
AD4C
 

"If you see a woman handling a cell phone on her hands while she is driving,do 
please stay away from her.!!

--- On Sat, 6/12/10, 4Z5TO <4z...@iarc.org> wrote:


From: 4Z5TO <4z...@iarc.org>
Subject: [Elecraft] K3 SSB Tx Audio
To: elecraft@mailman.qth.net
Date: Saturday, June 12, 2010, 1:51 PM



I haven't had the time lately to get on the air in the last several months,
but over the last couple of days I had a free hour here and there; I've
received exceptional audio reports. People have told me my sound and signal
are on par with local broadcast stations.

Hope that gives some some doubters a bit of hope if you want to use the K3
for SSB.

73,
4Z5TO



-
You're gonna have to answer to the Coca-Cola company.

http://www.iarc.org/~4z5to
-- 
View this message in context: 
http://elecraft.365791.n2.nabble.com/K3-SSB-Tx-Audio-tp5171637p5171637.html
Sent from the [K3] mailing list archive at Nabble.com.
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Re: [Elecraft] Quick question K3

[Ken Roberson]

Phil,

You can also monitor the power supply
voltage with the K3.

73 Ken K5DNL
---

--- On Sat, 6/12/10, Phil LaMarche  wrote:

> From: Phil LaMarche 
> Subject: [Elecraft] Quick question K3
> To: Elecraft@mailman.qth.net
> Date: Saturday, June 12, 2010, 11:03 AM
> Getting ready for the contest. 
> When I transmit on 6 at 92 watts and SWR of
> 1.7, the power shuts down after 30 seconds of
> transmitting.  Re-transmitt
> and it's OK for another 30 seconds. ???
>  
> Phil
>  
> Philip LaMarche
>  
> LaMarche Enterprises, Inc
> p...@lamarcheenterprises.com
> www.LaMarcheEnterprises.com   
>  
> 727-944-3226
> 727-937-8834 Fax
> 727-510-5038 Cell 
>  
> www.w9dvm.com  
>  
> K3 #1605
>  
> CCA 98-00827
> CRA 1701
> W9DVM
>  
>  
> __
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Re: [Elecraft] Quick question K3

[Ken Roberson]

Phil,

You might try it into a dummy load.

73 Ken K5DNL
---

--- On Sat, 6/12/10, Phil LaMarche  wrote:

> From: Phil LaMarche 
> Subject: [Elecraft] Quick question K3
> To: Elecraft@mailman.qth.net
> Date: Saturday, June 12, 2010, 11:03 AM
> Getting ready for the contest. 
> When I transmit on 6 at 92 watts and SWR of
> 1.7, the power shuts down after 30 seconds of
> transmitting.  Re-transmitt
> and it's OK for another 30 seconds. ???
>  
> Phil
>  
> Philip LaMarche
>  
> LaMarche Enterprises, Inc
> p...@lamarcheenterprises.com
> www.LaMarcheEnterprises.com   
>  
> 727-944-3226
> 727-937-8834 Fax
> 727-510-5038 Cell 
>  
> www.w9dvm.com  
>  
> K3 #1605
>  
> CCA 98-00827
> CRA 1701
> W9DVM
>  
>  
> __
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[Elecraft] K3 Problem

[Phil LaMarche]

Let me word my request differently.  The only thing that shuts down is the
wattage.  Goes from 95 to 0 after 30 seconds of transmitting.  Re key and it
does the same thing.  SSB.  Sorry for the confusion.  SWR 1.7:1.
 
Philip LaMarche
 
LaMarche Enterprises, Inc
p...@lamarcheenterprises.com
www.LaMarcheEnterprises.com   
 
727-944-3226
727-937-8834 Fax
727-510-5038 Cell 
 
www.w9dvm.com  
 
K3 #1605
 
CCA 98-00827
CRA 1701
W9DVM
 
 
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[Elecraft] Mobile mounting for K2 and/or K3

[John Lawrence]

I'm looking for any ideas for a source to mount the K2 or K3 in the Ford F250 
PU in the middle on the transmission hump. 

Ideally, a non-intrusive (to the radio housing) bracket arrangement to hold the 
radio so it can sit behind the shift up against the front seat at a slight 
angle. Without making custom brackets, is there anything out in the market that 
would work? 

I could mount the radio horizontally on to a laptop pedestal but they take up 
more room and are expensive. 

Thanks for sharing ideas

73,

John, W1QS
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Re: [Elecraft] WB3AAL on the AT

[Ron Polityka]

Hello,

 I arrived at my operating location north of Strausstown, PA 
where the Appalachian Trail and Rte.183 intersect. During my 
short hike into the area I found a box turtle on the trail. 
I took a couple of pictures and started to hike on the 
trail. I bumped into a Thru hiker doing the entire 
Appalachian Trail. He asked me a few questions and I was 
happy to help the hiker. He asked me what I was doing with a 
fishing pole and a small table. I told him that I was a Ham 
Radio operator. That was a good 15 minute talk about the 
hobby and what I have been working from the area. I took 
down his e-mail address to a message to his wife.

I was on the air calling CQ by 12:00 UTC on 14.060. I knew 
the bands were not in the best of shape but I did not hear 
many signals. I switched to 10.117 around 12:14 UTC and 
called CQ. No replies so I moved to 7.060, I really thought 
I was on 15 meters.  :-o I worked Dain - NI9Y in IN. Wow, 
signals were great until the QRN started rolling in on the 
band. I moved down to 7.040 and worked Pail - N8XMS in MI 
and Gene - W2BXR in SC. Everyone had the QSB and heavy QRN 
from the storms in the East.

 I called CQ for a little while longer but I did not have 
any luck. So I went back on 30 and 20m calling CQ. While 
calling CQ I noticed the dark clouds rolling into the area. 
I had cell phone coverage so I checked the radar. A large 
heavy line of rain was just upon my location on the radar. 
As soon as I closed the cell phone the rain started at 13:30 
UTC. I packed up quickly and headed back to my car.

 The rain stopped for a little while and I debated about 
going back and setting up. I took a short hike North bound 
on the AT. When I got back to the car I notice all the 
vehicles going south bound were wet and wipers were still 
turned on. I got into my car and the rain was coming down. I 
started my drive home around 14:00 UTC.

 Two of the three stations were running a K2 and a K3.

72 and Thanks,
Ron Polityka
WB3AAL

K1 - SN 01011
K2 - SN 01392

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Re: [Elecraft] K3 Problem

[Steve Ellington]

So in effect, you're loosing your modulation as if the mic. came loose.
Can you get a carrier when keying or is it just SSB that's acting up?
Steve
N4LQ
- Original Message - 
From: "Phil LaMarche" 
To: 
Sent: Saturday, June 12, 2010 12:52 PM
Subject: [Elecraft] K3 Problem


> Let me word my request differently.  The only thing that shuts down is the
> wattage.  Goes from 95 to 0 after 30 seconds of transmitting.  Re key and 
> it
> does the same thing.  SSB.  Sorry for the confusion.  SWR 1.7:1.
>
> Philip LaMarche
>
> LaMarche Enterprises, Inc
> p...@lamarcheenterprises.com
> www.LaMarcheEnterprises.com 
>
> 727-944-3226
> 727-937-8834 Fax
> 727-510-5038 Cell
>
> www.w9dvm.com 
>
> K3 #1605
>
> CCA 98-00827
> CRA 1701
> W9DVM
>
>
> __
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[Elecraft] K3 Problem

[Phil LaMarche]

Did a further test.  shuts down at 50 and 95 watts but not at 30 watts.
 
Phil
 
Philip LaMarche
 
LaMarche Enterprises, Inc
p...@lamarcheenterprises.com
www.LaMarcheEnterprises.com   
 
727-944-3226
727-937-8834 Fax
727-510-5038 Cell 
 
www.w9dvm.com  
 
K3 #1605
 
CCA 98-00827
CRA 1701
W9DVM
 
 
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Re: [Elecraft] K3 Problem

[Ken Roberson]

Phil,

Did you try the dummy load ???

73 Ken K5DNL

-

--- On Sat, 6/12/10, Phil LaMarche  wrote:

> From: Phil LaMarche 
> Subject: [Elecraft] K3 Problem
> To: Elecraft@mailman.qth.net
> Date: Saturday, June 12, 2010, 12:12 PM
> Did a further test.  shuts down
> at 50 and 95 watts but not at 30 watts.
>  
> Phil
>  
> Philip LaMarche
>  
> LaMarche Enterprises, Inc
> p...@lamarcheenterprises.com
> www.LaMarcheEnterprises.com   
>  
> 727-944-3226
> 727-937-8834 Fax
> 727-510-5038 Cell 
>  
> www.w9dvm.com  
>  
> K3 #1605
>  
> CCA 98-00827
> CRA 1701
> W9DVM
>  
>  
> __
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Re: [Elecraft] MMTTY FSK

[Rick Prather]

Chen,

Very interesting.  Thanks for your link.

Have you looked at the waveform with the AFSK TX Filter turned on?

Rick
K6LE

On 6/12/2010, at 9:09 , Kok Chen wrote:

> On Jun 12, 2010, at 6/125:09 AM, Richard Ferch wrote:
> 
>> Brett Howard wrote:
>>> I do see FSK as a method that is slightly less prone
>>> to TX distortions.
>> 
>> I have done some testing with a second
>> receiver, and my K3's RTTY signal seems to be cleaner in AFSK than FSK
>> (lower odd-order sidebands).
> 
> That is indeed correct.  AFSK can potentially produce cleaner signals  
> than FSK, as long the transmit IMD is good.  Take a look at the last  
> two figures on this page:
> 
> http://homepage.mac.com/chen/Technical/K3/Digital/digital.html
> 
> cocoaModem applies a filter to reduce the keying sidebands.  Except  
> for having two tones, the result is similar to what Alex VE3NEA had  
> described in his CW keying experiments article in QEX a couple of  
> years ago.
> 
> The difference between FSK and AFSK can be even greater than what I'd  
> measured if the K3 transmitter were cleaner.  Waveshaping the keying  
> signal created albeit small, temporal overlap between the two RTTY  
> tones, whereas an unwaveshaped FSK signal has no overlap and can be  
> used even with class C amplifiers.
> 
> You can indeed see the low level IMD spikes from the in the last  
> screen capture.
> 
> 73
> Chen, W7AY
> 

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[Elecraft] K3 RX antenne not working on TB

[Dick Grolleman]

Hello All

Just discovered a strange thing last night. As I switched from 80 CW, to 160m 
using the same RX antenna, there was no receiption on TB. If I switch from TX 
antenna 1 to 2, and hit RX antenna it is working. Why is the RX antenna only 
working when antenna 2 selected? This happens only on 160m, 80 m is fine when 
antenna 1 selected. I have been using the rig for over 2 years now nver had the 
problem before.
serial number #1168
using FW 3.63 for a long time, so that did not change it either.

73 de Dick PA3FQA
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Re: [Elecraft] Mobile mounting for K2 and/or K3

[Don Wilhelm]

John,

Try velcro - it works for a lot of tough mounting situations.
Velcro strap - the kind that sticks the two sides togetheer might be 
handy too.

73,
Don W3FPR

John Lawrence wrote:
> I'm looking for any ideas for a source to mount the K2 or K3 in the Ford F250 
> PU in the middle on the transmission hump. 
>
> Ideally, a non-intrusive (to the radio housing) bracket arrangement to hold 
> the radio so it can sit behind the shift up against the front seat at a 
> slight angle. Without making custom brackets, is there anything out in the 
> market that would work? 
> qsl.net/donate.html
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Re: [Elecraft] Quick question K3

[Guy Olinger K2AV]

Tap DISP, then turn VFO B until you get the display with "A" to the
side.  What kind of current are you pulling with 92 watts into 1.7 SWR
when it shuts off?   Also turn VFO B until PA shows on the display,
what temperature are you getting when it shuts off?

73, Guy.

On Sat, Jun 12, 2010 at 12:03 PM, Phil LaMarche  wrote:
> Getting ready for the contest.  When I transmit on 6 at 92 watts and SWR of
> 1.7, the power shuts down after 30 seconds of transmitting.  Re-transmitt
> and it's OK for another 30 seconds. ???
>
> Phil
>
> Philip LaMarche
>
> LaMarche Enterprises, Inc
> p...@lamarcheenterprises.com
> www.LaMarcheEnterprises.com 
>
> 727-944-3226
> 727-937-8834 Fax
> 727-510-5038 Cell
>
> www.w9dvm.com 
>
> K3 #1605
>
> CCA 98-00827
> CRA 1701
> W9DVM
>
>
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Re: [Elecraft] [K2] KPA100 - Antenna Help

[Don Wilhelm]

David,

I just thought of something else - the KPA100 may be oscillating on 
you.  That fact will not show up on a dummy load, but because an antenna 
is frequency selective, it will indicate Hi-refl.  The KPA100 *should* 
detect that condition and reduce the power, but for some reason yours is 
not. and I strongly suspect the T/R switch area.

Check the T/R switch components carefully - particularly the orientation 
of Q6 and Q7 and the diodes.  Also check the soldering for C31.  Make 
certain the value of C31 is .22 uF.

Since you likely do not want to test on-the-air with that condition, if 
you have a tuner (preferrably a link coupled tuner), connect the output 
to a dummy load and then adjust the tuner for a 1:1 SWR at the frequency 
you will be testing.  If the KPA100 is oscillating at some parasitic 
frequency, Hi-Refl will be indicated because of the tuned circuit 
between the KPA100 and the dummy load.

73,
Don W3FPR

David Douglass wrote:
> OK, to add to my last,
>
> I've just tried with a different antenna on 40m. Again, once I engage the 
> KPA100, I get high SWR, power overshoot and a blown fuse. So it doesn't seem 
> to be antenna related but seems to be band related. 30m-10m is Ok. I don't 
> have an antenna for 80/160 so can't check.
>
> All bands are fine with a dummy load...
>
> David
>   - Original Message - 
>   From: David Douglass 
>   To: elecraft@mailman.qth.net 
>   Sent: Saturday, June 12, 2010 12:04 PM
>   Subject: [K2] KPA100 - Antenna Help
>
>
>   Hi All,
>
>   A bit of a strange one here..
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>   
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Re: [Elecraft] KREF3 External Reference card

[SM6TUW]

Guys,



Someone on the fora pointed out that we all have different 49 MHz
oscillators!

I guess that many K3 owners *have bought oscillators delivered without input
for the voltage control* not knowing that a future locking to an external
reference would *not* be possible.

The KTCXO3-1 delivered to me is manufactured by *KS* Electronics (part
number 1099) and pin 1

(VCTRL) is *not connected* internally. *It can´t even be used to be locked
in a PLL*. Also if a PLL is to be implemented you need to specify *Kv
(tuning sensitivity)* for all oscillators to be delivered to your customers
 in order to keep the PLL loop filter working correctly. Did you offer a
solution to this when you envisioned a *“REF IN (SMA): input for future
external reference”.*

* *

Which type of oscillator delivered by Elecraft have VCTRL connected to pin
#1 ?**



What is the Kv specified pin #1 is connected?





Comment on this please!









73



Jan
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Re: [Elecraft] MMTTY FSK

[Mike]

Not more difficult, just more equipment involved (and $$) unless 
you're doing it all from the K3, not using any external interface.

73, Mike NF4L

Bob Naumann wrote:
> Where did the idea that FSK is more difficult come from?
>
> FSK requires no setting of transmit audio levels or concerns about sound
> card settings - for transmission.
>
> To me, this cuts the difficulty in half.
>
> Using a RigExpert or MicroHam (or their equivalent) Interface it's basically
> automatic and requires no fiddling with levels.
>
> 100% FSK RTTY here. Zero problems.
>
> 73,
>
> Bob W5OV
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mike
> Sent: Saturday, June 12, 2010 6:37 AM
> To: Brett Howard
> Cc: elecraft
> Subject: Re: [Elecraft] MMTTY FSK
>
> Fair enough.
>
> Mike NF4L
>
> Brett Howard wrote:
>   
>> I'm one of those guys that is a glutton for punishment...  To me the
>> fact that FSK is more complicated and I've not done it before is the
>> actual advantage.  I do see FSK as a method that is slightly less prone
>> to TX distortions.  I built my interface using opto couplers and then
>> put in a few jumpers to allow for several grounding situations.  Turned
>> out that 100% disconnect between all grounds is working very well.
>>
>> ~Brett (N7MG)
>>
>> On Fri, 2010-06-11 at 19:28 -0400, Mike wrote:
>>   
>> 
>>> When I got my K3, I was hot to get it set up on FSK. Somebody here 
>>> convinced me to try AFSK, and I was blown away by how simple it is, and 
>>> less complicated to set up. AFAICT, FSK offers no advantage.
>>>
>>> 73, Mike NF4L
>>>
>>> Brett Howard wrote:
>>> 
>>>   
 Ok so I've never done RTTY via true FSK only audio modes...  I have to
 put in a fence this weekend so I won't be able to play this weekend but
 I'm trying to get ready for FD...  

 So I've made an interface that consists of a couple opto couplers (one
 for FSK and one for PTT)...  I've got the radio all setup and shorting
 the FSK_IN pin to GND makes the radio switch tones as it should...

 However I'm having issues getting MMTTY to open the COM port.  I'm using
 an FTDI based USB->RS232 converter.  The MMTTY settings have the USB
 button right there and they tell me to click on the last 3 options.
 I've tried all 3 but in all 3 modes I get the unable to open COM3
 error...

 I'm going to be googling and seeing if anyone else has had this issue
 with me but I figured I'd pose here in the event someone here has
 already run into this issue.

 ~Brett (N7MG)

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>>> 
>>>   
>>
>>   
>> 
>
>
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[Elecraft] UK Elecraft SSB net

[Ian Maude]

Hi all,
I will be running the UK Elecraft SSB net on 3658 +/- QRM tomorrow morning
at 09:00 BST as usual.  I hope to hear you there.

73 Ian

-- 
Ian J Maude, G0VGS
SysOp GB7MBC & HB9DRV-9 DX Clusters
Member RSGB, GQRP 9838, FISTS 14077 | K3 #455
http://www.amateurradiotraining.org
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[Elecraft] Let me build a K2 for you.

[Alan Price]

I have built more than 300 K2's and many of the other Elecraft kits.  Let me 
build one for you.  You will receive a new radio with the options you want.  My 
prices are reasonable.  Please respond off of the reflector.

 

73

Alan

W1HYV
  
_
The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail.
http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4
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[Elecraft] KIO2 with KUSB

[Ed Lambert]

I built and installed the KIO2 about 6 or 7 years ago, successfully used it
in one contest and then entered a period of relative inactivity where the
KIO2 was not used.

 

During the recent CQ WPX, I realized that my old KIO2 - computer serial
cable was relatively useless to me now because my current computers have
USB, not serial connections. (And my original KIO2 serial cable has become
lost.)

 

I purchased the KUSB and carefully installed the Elecraft recommended
driver. The first problem I noticed was that when I plugged the KUSB into my
computer (I tried this on two different computers) is that the New Hardware
Wizard appears. (I wasn't expecting this; I thought that the installation
was complete). So, the first time I ignored the wizard and tried to connect
my K2. No good; the K2 is completely locked up. I cannot control it from the
front panel nor can I control it from the computer.

 

So I uninstalled and reinstalled the driver and, this time did not ignore
the Wizard. I manually selected the appropriate driver and tried again. I
got the same result.

 

Has anybody seen a problem like this?

 

Full disclosure: my faithful dog, Chama, became entangled in the wire mess
under my desk during the contest and dumped the K2 onto a concrete floor. I
have noticed no changes in the radio's operation and have done some visual
and electrical checks and found nothing wrong. That doesn't mean, however,
that my KIO2 wasn't damaged somehow.

 

I welcome any ideas.

 

Ed Lambert

KD3Y

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[Elecraft] Intermod or mixing?

[Larry Godek]

I've got some local noise around here that sounds like a water heater or sorts 
or something along that line.  Anyway it's really giving me fits on 6 meters.  
I ahve to run the NB almost all the time and that distorts the signals and 
sometimes it doesn't even clean up the noise.  Doesn't matter if i use the 
preamp, attenuator, Noise reduction or what.  Plus when i turn the NB on i get 
all sorts of crap from SSb signals 40 plus kc up in the band.  If i turn the NB 
off the SSb crud is gone.  I operate mostly in the CW portion of the band.  
When the NB is off i don't ahve this problem. Other than finding the noise out 
there in the 0-90 degree quadrant anyone have any idea as to whats going on?  
I'm really getting sick of the SSb crud showing up when the NB is on down in 
the CW portion of the band.  I only have one antenna hooked to the radio.  What 
else can i tell you?

Larry
W0OGH

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[Elecraft] Repair of K3 sub-boards

[Pete Smith]

I have just changed out the KIO3A main I/O board on my new K3 - an 
expensive lesson in lightning-induced EMP damage, I guess.  Too bad it 
wasn't the digital I/O daughter board, which is cheap by comparison.

Would there be any point in sending the $106 board back to Elecraft for 
diagnosis and repair, or is it generally not cost-effective to do so?  
If not, I'm tempted to try changing out U1 on my own, just to see if 
that's all that's wrong.

Opinions?

-- 
73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at 
reversebeacon.blogspot.com

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Re: [Elecraft] KIO2 with KUSB

[Don Wilhelm]

Ed,

Sorry to be the bearer of bad news, but you should *not* have plugged 
that or any other USB to serial cable directly into the K2.
You connected RS-232 level signal to pins on the K2 AUX I/O that are not 
intended to have RS-232 levels applied.  Only pins 2 and 3 can handle 
the RS-232 levels.  You must use the cable wired as described in the 
KIO2 manual, even if it is a short cable.
Depending on the serial number (and if older whether it has the A to B 
mods), damage may have been minimized.

You could *try* a Master Reset to see if that possibley does anything of 
value (but you will have to set up your filters, do CAL PLL and set up 
any other menu items since all will be restored to the default values if 
the reset succeeds.
To do the Master Reset, hold the 4, 5, and 6 buttons down as you power 
the K2 on.  Then power off and back on - if it was successful, you will 
see an info 201 message displayed  for a while before the frequency 
comes up to 7100.00

73,
Don W3FPR

Ed Lambert wrote:
> I built and installed the KIO2 about 6 or 7 years ago, successfully used it
> in one contest and then entered a period of relative inactivity where the
> KIO2 was not used.
>
>  
>
> During the recent CQ WPX, I realized that my old KIO2 - computer serial
> cable was relatively useless to me now because my current computers have
> USB, not serial connections. (And my original KIO2 serial cable has become
> lost.)
>
>  
>
> I purchased the KUSB and carefully installed the Elecraft recommended
> driver. The first problem I noticed was that when I plugged the KUSB into my
> computer (I tried this on two different computers) is that the New Hardware
> Wizard appears. (I wasn't expecting this; I thought that the installation
> was complete). So, the first time I ignored the wizard and tried to connect
> my K2. No good; the K2 is completely locked up. I cannot control it from the
> front panel nor can I control it from the computer.
>
>  
>
> So I uninstalled and reinstalled the driver and, this time did not ignore
> the Wizard. I manually selected the appropriate driver and tried again. I
> got the same result.
>
>  
>
> Has anybody seen a problem like this?
>
>  
>
> Full disclosure: my faithful dog, Chama, became entangled in the wire mess
> under my desk during the contest and dumped the K2 onto a concrete floor. I
> have noticed no changes in the radio's operation and have done some visual
> and electrical checks and found nothing wrong. That doesn't mean, however,
> that my KIO2 wasn't damaged somehow.
>
>  
>
> I welcome any ideas.
>
>  
>
> Ed Lambert
>
>   
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Re: [Elecraft] Intermod or mixing?

[Matt Zilmer]

DFing the problem is probably your best bet.  I had to do that with a
S9+30 noise source on freqs lower than 10 MHz.  It was an unused
irrigation transformer with open leads (arcing).  It was almost
1/2-mile from the shack.  Crud like this carries a long distance.

Your local electrical utility should be able to help with this, since
almost all of them have "electrical supply quality" departments.  In
most US states, the utility can also force a customer to fix the
problem if it's not utility-owned equipment.  The field personnel that
do this professionally are very capable, and yes - many of them really
can find a needle in a haystack.

73 and Good Luck!

matt zilmer, W6NIA

On Sat, 12 Jun 2010 14:34:06 -0700 (PDT), you wrote:

>I've got some local noise around here that sounds like a water heater or sorts 
>or something along that line.  Anyway it's really giving me fits on 6 meters.  
>I ahve to run the NB almost all the time and that distorts the signals and 
>sometimes it doesn't even clean up the noise.  Doesn't matter if i use the 
>preamp, attenuator, Noise reduction or what.  Plus when i turn the NB on i get 
>all sorts of crap from SSb signals 40 plus kc up in the band.  If i turn the 
>NB off the SSb crud is gone.  I operate mostly in the CW portion of the band.  
>When the NB is off i don't ahve this problem. Other than finding the noise out 
>there in the 0-90 degree quadrant anyone have any idea as to whats going on?  
>I'm really getting sick of the SSb crud showing up when the NB is on down in 
>the CW portion of the band.  I only have one antenna hooked to the radio.  
>What else can i tell you?
>
>Larry
>W0OGH
>
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Re: [Elecraft] Intermod or mixing?

[Joe Planisky]

Hi Larry,

I assume you've tried playing with different settings of both the IF  
and DSP noise blankers.  If not, by all means try it and use the least  
aggressive settings that make the situation tolerable.

I'm not sure how the DSP NB works, but the IF NB works by essentially  
shutting off the signal path in the IF stage for the duration of the  
noise pulse.  For relatively infrequent pulses, these brief blank  
spots in the received signal aren't very noticeable to our ears.   
However, if the blanking action is frequent (either because of the  
nature of the noise or because the threshold is set too low), the  
blanker effectively becomes a mixer combining the desired signal at  
the IF frequency with the frequency of the noise pulses (and harmonics  
thereof, etc.)  When this happens, you'll hear distortion and  
"intermod" just as you've described.  I'm afraid it's the nature of  
the beast.

Your best bet in the long run is to find and fix the source of the  
noise.  A distant second best is backing off the NB settings to find a  
compromise between the noise and the intermod that's at least tolerable.

73
--
Joe KB8AP


On Jun 12, 2010, at 2:34 PM, Larry Godek wrote:

> I've got some local noise around here that sounds like a water  
> heater or sorts or something along that line.  Anyway it's really  
> giving me fits on 6 meters.  I ahve to run the NB almost all the  
> time and that distorts the signals and sometimes it doesn't even  
> clean up the noise.  Doesn't matter if i use the preamp, attenuator,  
> Noise reduction or what.  Plus when i turn the NB on i get all sorts  
> of crap from SSb signals 40 plus kc up in the band.  If i turn the  
> NB off the SSb crud is gone.  I operate mostly in the CW portion of  
> the band.  When the NB is off i don't ahve this problem. Other than  
> finding the noise out there in the 0-90 degree quadrant anyone have  
> any idea as to whats going on?  I'm really getting sick of the SSb  
> crud showing up when the NB is on down in the CW portion of the  
> band.  I only have one antenna hooked to the radio.  What else can i  
> tell you?
>
> Larry
> W0OGH
>
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Re: [Elecraft] Intermod or mixing?

[Richard]

Would someone please furnish definitions of these two terms, and  
explain the difference between them--if there really is a difference.

Sent from my iPhone



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Re: [Elecraft] Intermod or mixing?

[Dick Roth, KA1OZ]

Mixing is a general term for combining any two or more signals through 
the process of heterodyning.

Intermod is a specific form of mixing which combines harmonic products 
of two RF signals:  the desired receive signal and an undesired, 
accidental signal, yielding a series of harmonically related RF 
byproducts that can impair the receive pass band.

I hope I stated this correctly and that it helps to differentiate the 
two terms adequately.


Richard wrote:
> Would someone please furnish definitions of these two terms, and
> explain the difference between them--if there really is a difference.
>
> Sent from my iPhone
>

[snip]

-- 
73,
Dick ka1oz
Middleborough, MA

Radio:  Elecraft K3/100(Kit) SN 859
Antenna:  Titan-DX
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Re: [Elecraft] Intermod or mixing?>>>CORRECTION!

[Dick Roth, KA1OZ]

Regarding Intermod, I misspoke when stating that there was a harmonic 
relationship.  I meant to say a relationship between the sum and 
difference frequencies that yield products up and down the band spaced 
these difference frequencies.

Sorry,

Dick



Mixing is a general term for combining any two or more signals through 
the process of heterodyning.

Intermod is a specific form of mixing which combines harmonic products 
of two RF signals:  the desired receive signal and an undesired, 
accidental signal, yielding a series of harmonically related RF 
byproducts that can impair the receive pass band.

I hope I stated this correctly and that it helps to differentiate the 
two terms adequately.


Richard wrote:
> Would someone please furnish definitions of these two terms, and
> explain the difference between them--if there really is a difference.
>
> Sent from my iPhone
>

[snip]

-- 
73,
Dick ka1oz
Middleborough, MA

Radio:  Elecraft K3/100(Kit) SN 859
Antenna:  Titan-DX
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[Elecraft] [KX1] Auto-tuners for KX1

[Phil Hystad]

So, what is the better way to go.  There is the internal KXAT1 auto-tuner for 
$99 and then there is the external T1 auto-tuner for $136.

Are these the same or equivalent tuners?

What is the SWR range for these?  10:1, 5:1, or 3:1 or whatever?

Is there an advantage to the KXAT1 other then the fact that it is internal?

Thanks for any answers and comments.

73, phil, K7PEH


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Re: [Elecraft] [KX1] Auto-tuners for KX1

[Wayne Burdick]

Hi Phil,

The T1 has a wider matching range. The internal tuner is optimized for  
40-20 m and a wire tossed in a tree.

73,
Wayne
N6KR


http://www.elecraft.com

On Jun 12, 2010, at 8:07 PM, Phil Hystad  wrote:

> So, what is the better way to go.  There is the internal KXAT1 auto- 
> tuner for $99 and then there is the external T1 auto-tuner for $136.
>
> Are these the same or equivalent tuners?
>
> What is the SWR range for these?  10:1, 5:1, or 3:1 or whatever?
>
> Is there an advantage to the KXAT1 other then the fact that it is  
> internal?
>
> Thanks for any answers and comments.
>
> 73, phil, K7PEH
>
>
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[Elecraft] FS: K2 SN0219 with updates, fairly loaded...

[Ross Primrose N4RP]

For Sale, K2 #0219.  10W model.  Has almost all the available updates 
except the K2 Keying Bandwidth Mod, which requires FW 2.04, radio has 
2.02f.  Includes: KAF2, KNB2, KIO2, KAT2, KSB2, K160RX, setup with fixed 
audio out on mic jack for digital modes.  Power jack replaced with cable 
with Anderson Power Poles.  Complete documentation for radio and all 
modules, and all mods.  Includes serial cable for KIO2, and mic jack to 
dual RCA cable for use with digital modes.  Selling to raise money for a K3.

$900/OBO shipped CONUS  Prefer paypal, but USPS MO OK as well.

73, Ross N4RP

-- 
FCC Section 97.313(a) "At all times, an amateur station must use the minimum 
transmitter power necessary to carry out the desired communications."

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Re: [Elecraft] [KX1] Auto-tuners for KX1

[Phil Hystad]

Wayne,

Thanks.  So, is tossing the wire in the tree part of the tuning process? :-)

phil

On Jun 12, 2010, at 8:15 PM, Wayne Burdick wrote:

> Hi Phil,
> 
> The T1 has a wider matching range. The internal tuner is optimized for 40-20 
> m and a wire tossed in a tree.
> 
> 73,
> Wayne
> N6KR
> 
> 
> http://www.elecraft.com
> 
> On Jun 12, 2010, at 8:07 PM, Phil Hystad  wrote:
> 
>> So, what is the better way to go.  There is the internal KXAT1 auto-tuner 
>> for $99 and then there is the external T1 auto-tuner for $136.
>> 
>> Are these the same or equivalent tuners?
>> 
>> What is the SWR range for these?  10:1, 5:1, or 3:1 or whatever?
>> 
>> Is there an advantage to the KXAT1 other then the fact that it is internal?
>> 
>> Thanks for any answers and comments.
>> 
>> 73, phil, K7PEH
>> 
>> 
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Re: [Elecraft] [KX1] Auto-tuners for KX1

[Don Wilhelm]

Phil,

The T1 tuner has a greater tuning range than the KXAT1.  One cannot just 
simply say that a tuner will match a specific SWR - the characteristics 
of that particular SWR must be expressed in terms of resistance and 
reactance to totally answer your question.
Look at the maximum L and maximum C proveded by each tuner, and then 
apply those values to an L-network at the frequency of interest.

All tuners will have a greater matching range at higher frequencies, and 
the range will be compressed at lower frequencies.

So one must translate the SWR into resistance and reactive components 
(the values plot to a circle on the Smith Chart), and then see what 
values of C and L in an L network will bring that SWR to a 50 ohm point 
on the Smith Chart - if those values are within the maximum L and C 
values provided by the tuner, then that tuner will handle it - if 
outside those boundaries, a good match is not possible.

73,
Don W3FPR

Phil Hystad wrote:
> So, what is the better way to go.  There is the internal KXAT1 auto-tuner for 
> $99 and then there is the external T1 auto-tuner for $136.
>
> Are these the same or equivalent tuners?
>
> What is the SWR range for these?  10:1, 5:1, or 3:1 or whatever?
>
> Is there an advantage to the KXAT1 other then the fact that it is internal?
>
> Thanks for any answers and comments.
>
> 73, phil, K7PEH
>
>
> __
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>   
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Re: [Elecraft] Intermod or mixing?>>>CORRECTION!

[Richard]

Thank you Dick.  Nicely done.

Sent from my iPhone

On Jun 12, 2010, at 21:30, "Dick Roth, KA1OZ"   
wrote:

> Regarding Intermod, I misspoke when stating that there was a  
> harmonic relationship.  I meant to say a relationship between the  
> sum and difference frequencies that yield products up and down the  
> band spaced these difference frequencies.
>
> Sorry,
>
> Dick
>
>
>
> Mixing is a general term for combining any two or more signals  
> through the process of heterodyning.
>
> Intermod is a specific form of mixing which combines harmonic  
> products of two RF signals:  the desired receive signal and an  
> undesired, accidental signal, yielding a series of harmonically  
> related RF byproducts that can impair the receive pass band.
>
> I hope I stated this correctly and that it helps to differentiate  
> the two terms adequately.
>
>
> Richard wrote:
>> Would someone please furnish definitions of these two terms, and
>> explain the difference between them--if there really is a difference.
>>
>> Sent from my iPhone
>>
>
> [snip]
>
> -- 
> 73,
> Dick ka1oz
> Middleborough, MA
>
> Radio:  Elecraft K3/100(Kit) SN 859
> Antenna:  Titan-DX
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[Elecraft] Elecraft CW Net Announcement

[Kevin Rock]

Good Evening,
   We had a new season today.  The temperature zoomed to 74 degrees with a 
bright sun.  I worked behind the house until the heat pushed me to the front 
yard.  However, I got most of the weed whacking and tree trimming done before 
then.  I was going to get on the roof and repair an antenna but it was just too 
warm.  Changing from the mid 50s to the mid 70s in one day was too much for me. 
 Tomorrow it will still be warm with a predicted high of 68 degrees.  It felt 
very nice to have all the windows open.  It has been a very long winter!
   Propagation has been spotty this week.  My morning sked on 20 meters was cut 
short once and made tough a few other times.  But, on Friday, it was quite 
good.  The raccoon hunts were difficult on both evenings.  Both 20 and 40 
meters were not good enough to elicit many contacts.  I wonder how the fox 
hunts will fare?  The has been active.  I wonder what these sunspots will be 
like when the rotate back into view?

Please join us tomorrow afternoon and evening.
 
1) Hail signs  (first letter or two of the suffix of your call)
2) NCS help  (as well as QSP/QNP  help)
 
Sunday 2200z (Sunday 3 PM PDT) 14050 kHz
Monday z (Sunday 5 PM PDT)  7045 kHz
 
   Stay well,
  Kevin.  KD5ONS
 
-
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