[Elecraft] [K4] IF Out

[john]

The K4 does not appear to have an IF Out connector on the rear panel, 
like the K3. Can the XVTR IF Out be configured to provide this 
functionality?


  - John, N0TA

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] KX2, W1, AIM-4170

[James Bennett via Elecraft]

The W6PQL amp and MFJ wattmeter have been sold.

Still have the KX2, AIM-4170C, and the KX2 heatsink kit available...

> On Jan 20, 2021, at 1:06 PM, James Bennett via Elecraft 
>  wrote:
> 
> Moving out of CA before they put up a fence! I’ve got the following items for 
> sale that will help (slightly) lighten the load of packing and moving:
> 
> KX2 serial #01990 with built-in KXAT2 antenna tuner, Fred Cady KX2 book, and 
> Right-angle BNC connector. The KX2 and tuner work perfectly - no scratches or 
> dents. Has never been used on any digital modes (other than CW!) and has 
> never been driven really hard. Book is in brand-new condition. Cost new would 
> run you $1,080 plus tax & shipping.  ASKING $850 shipped USPS Priority mail 
> to lower 48.
> 
> Pro Audio Engineering PAE-KX22 Heatsink, Left Plate, and Plexiglass cover for 
> KX2. Still in shipping box, never out of the packaging. With PAE installation 
> and owner's manual. Cost new will run you $130 plus shipping. ASKING $100 
> shipped USPS Priority Mail to lower 48.
> 
> Elecraft W1 Wattmeter - built. Assembled by me - works fine, however the 
> green and yellow LEDs were reversed when I built it. D’oohhh. Doesn’t affect 
> the operation, I just didn’t want to bother unsoldering the LEDs and re-doing 
> them! Cost new (as a kit) will run you $130 plus tax & shipping.  ASKING $70 
> shipped USPS Priority Mail to lower 48.
> 
> W6PQL 2 meter/80 watt amp and MFJ-873 VHF/UHF power/SWR meter. Built per the 
> May 2013 QST article, has been my 2 meter amp driven by my K3. Works fine. 
> Will be accompanied by the QST article pages. I made a small user-mod to the 
> MFJ-873 - added an on/off switch on the back of the unit so the internal 
> meter lamp can be turned off if desired. ASKING $100 shipped USPS Priority 
> Mail to the lower 48.
> 
> Array Solutions AIM-4170C VNA. Covers 100KHz - 170 MHz. Includes the VNA, 
> 110v power adapter, 12v Power Pole cable, Serial - USB cable, Array Solutions 
> short/open/50-ohm precision loads, and the original hard plastic carry case. 
> This is a great VNA for anyone doing antenna work - simple setup to your 
> Windows-based PC. Just connect power and the cable to a USB port on your 
> computer. Free, very comprehensive software at ArraySolutions.com 
> . This unit has been superseded by the AIM-4300 
> which currently sells for $880. I’m ASKING $250 for the 4170C package shipped 
> USPS Priority Mail to the lower 48.
> 
> I can accept PayPal to my call @ arrl.net, cash, or cleared check.
> 
> Please contact me off-list if you have questions or are interested.
> 
> Thanks, Jim / W6JHB
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to w6...@me.com

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] KX2, W1, AIM-4170

[James Bennett via Elecraft]

The W1 has been sold.

> On Jan 20, 2021, at 1:06 PM, James Bennett via Elecraft 
>  wrote:
> 
> Moving out of CA before they put up a fence! I’ve got the following items for 
> sale that will help (slightly) lighten the load of packing and moving:
> 
> KX2 serial #01990 with built-in KXAT2 antenna tuner, Fred Cady KX2 book, and 
> Right-angle BNC connector. The KX2 and tuner work perfectly - no scratches or 
> dents. Has never been used on any digital modes (other than CW!) and has 
> never been driven really hard. Book is in brand-new condition. Cost new would 
> run you $1,080 plus tax & shipping.  ASKING $850 shipped USPS Priority mail 
> to lower 48.
> 
> Pro Audio Engineering PAE-KX22 Heatsink, Left Plate, and Plexiglass cover for 
> KX2. Still in shipping box, never out of the packaging. With PAE installation 
> and owner's manual. Cost new will run you $130 plus shipping. ASKING $100 
> shipped USPS Priority Mail to lower 48.
> 
> Elecraft W1 Wattmeter - built. Assembled by me - works fine, however the 
> green and yellow LEDs were reversed when I built it. D’oohhh. Doesn’t affect 
> the operation, I just didn’t want to bother unsoldering the LEDs and re-doing 
> them! Cost new (as a kit) will run you $130 plus tax & shipping.  ASKING $70 
> shipped USPS Priority Mail to lower 48.
> 
> W6PQL 2 meter/80 watt amp and MFJ-873 VHF/UHF power/SWR meter. Built per the 
> May 2013 QST article, has been my 2 meter amp driven by my K3. Works fine. 
> Will be accompanied by the QST article pages. I made a small user-mod to the 
> MFJ-873 - added an on/off switch on the back of the unit so the internal 
> meter lamp can be turned off if desired. ASKING $100 shipped USPS Priority 
> Mail to the lower 48.
> 
> Array Solutions AIM-4170C VNA. Covers 100KHz - 170 MHz. Includes the VNA, 
> 110v power adapter, 12v Power Pole cable, Serial - USB cable, Array Solutions 
> short/open/50-ohm precision loads, and the original hard plastic carry case. 
> This is a great VNA for anyone doing antenna work - simple setup to your 
> Windows-based PC. Just connect power and the cable to a USB port on your 
> computer. Free, very comprehensive software at ArraySolutions.com 
> . This unit has been superseded by the AIM-4300 
> which currently sells for $880. I’m ASKING $250 for the 4170C package shipped 
> USPS Priority Mail to the lower 48.
> 
> I can accept PayPal to my call @ arrl.net, cash, or cleared check.
> 
> Please contact me off-list if you have questions or are interested.
> 
> Thanks, Jim / W6JHB
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to w6...@me.com

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Mag Loop

[Eric Norris]

I built two mag loops, one with an MFJ butterfly cap, and one with a
massive 60pf bread-slicer I found on Ebay--if my calculations are correct,
the monster should take a kw of power on 20m.  The MFJ capacitor is not
high quality, but it works over a wide range.  However, I much prefer my
AlexLoops for portability and ease of setup--they set up on a cheap photo
tripods with the heads removed.  My homebrew loops require guys because of
their size and weight.  The AlexLoop sets up in less than 60 seconds, as
shown here in a video I shot near a salt-water amplifier:

https://youtu.be/TVsm-Mpwj6c


73 Eric WD6DBM
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] FS: KX2, W1, AIM-4170

[Jay Rutherford]

Hi Jim,

USPS Priority Mail goes to Alaska and Hawaii just like it does to the lower 48, 
same price. Why reduce your possible pool of buyers?

73
Jay K3BH

Jim wrote:

...

ASKING  $850 shipped USPS Priority mail to lower 48.
> 
ASKING $100 shipped USPS Priority Mail to lower 48.

...
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

[Elecraft] FS: KX2, W1, AIM-4170

[James Bennett via Elecraft]

Moving out of CA before they put up a fence! I’ve got the following items for 
sale that will help (slightly) lighten the load of packing and moving:

KX2 serial #01990 with built-in KXAT2 antenna tuner, Fred Cady KX2 book, and 
Right-angle BNC connector. The KX2 and tuner work perfectly - no scratches or 
dents. Has never been used on any digital modes (other than CW!) and has never 
been driven really hard. Book is in brand-new condition. Cost new would run you 
$1,080 plus tax & shipping.  ASKING $850 shipped USPS Priority mail to lower 48.

Pro Audio Engineering PAE-KX22 Heatsink, Left Plate, and Plexiglass cover for 
KX2. Still in shipping box, never out of the packaging. With PAE installation 
and owner's manual. Cost new will run you $130 plus shipping. ASKING $100 
shipped USPS Priority Mail to lower 48.

Elecraft W1 Wattmeter - built. Assembled by me - works fine, however the green 
and yellow LEDs were reversed when I built it. D’oohhh. Doesn’t affect the 
operation, I just didn’t want to bother unsoldering the LEDs and re-doing them! 
Cost new (as a kit) will run you $130 plus tax & shipping.  ASKING $70 shipped 
USPS Priority Mail to lower 48.

W6PQL 2 meter/80 watt amp and MFJ-873 VHF/UHF power/SWR meter. Built per the 
May 2013 QST article, has been my 2 meter amp driven by my K3. Works fine. Will 
be accompanied by the QST article pages. I made a small user-mod to the MFJ-873 
- added an on/off switch on the back of the unit so the internal meter lamp can 
be turned off if desired. ASKING $100 shipped USPS Priority Mail to the lower 
48.

Array Solutions AIM-4170C VNA. Covers 100KHz - 170 MHz. Includes the VNA, 110v 
power adapter, 12v Power Pole cable, Serial - USB cable, Array Solutions 
short/open/50-ohm precision loads, and the original hard plastic carry case. 
This is a great VNA for anyone doing antenna work - simple setup to your 
Windows-based PC. Just connect power and the cable to a USB port on your 
computer. Free, very comprehensive software at ArraySolutions.com 
. This unit has been superseded by the AIM-4300 
which currently sells for $880. I’m ASKING $250 for the 4170C package shipped 
USPS Priority Mail to the lower 48.

I can accept PayPal to my call @ arrl.net, cash, or cleared check.

Please contact me off-list if you have questions or are interested.

Thanks, Jim / W6JHB
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Mag Loop

[Gwen Patton]

I made a small transmitting loop a couple of years ago as an experiment
with a material I wanted to try. One of the materials was not appropriate,
but I made it work for the sake of the experiment. I plan to make another
loop at some point from a different material so it's not an issue, but that
was only the *support* material for the loop. I wanted a loop I could fold
or roll up into a small package to take it to parks and such, that wouldn't
require stakes or lofting things into trees, in case the local authorities
don't like that.

The support material was some plastic perforated strap for supporting
pipes, conduits, and BX cables in basements and attics. The holes are an
inch apart on centers, and the stuff is VERY strong. It's also
flexible...but TOO flexible. It had no supportive strength whatsoever,
which was a problem for this project. I wound up making supports for it out
of thin wood, which worked, but it wasn't what I originally had in mind.
But it's not the support material I'm writing this to mention. I'm talking
about the conductor.

I used 1/2 inch wide adhesive copper foil. The adhesive is also conductive.
It's not very strong, but it's VERY conductive, and it's lack of thickness
isn't an issue because it has a lot of surface area, where the RF is
actually conducted, so it should have great bandwidth. I had a decent
variable air-gap capacitor, with a 10X vernier control on it, and used a
small wooden base, like a miniature pallet, as a platform for the entire
thing. I priced thin wooden furring strips for the rest of the supports,
but they were more expensive than I liked. So I bought a dozen wooden
meter-sticks for about half what the furring strips would have cost. They
work very well for situations where you need a thin but strong piece of
wood. I ran the copper foil tape the length of a piece of the plastic strap
to give me a loop I calculated for 40m-10m. The copper foil takes solder
very nicely, so it was simple to work with. The wooden supports I made were
a six-pointed star, the bottom being flattened for the connections at each
end of the loop and the capacitor. I made a coupling loop out of a similar
piece of plastic strap and the same foil tape, and connected it to the
coax, about 15 feet of RG-174.

I used this loop indoors, on a wire rack next to my workbench, and used it
with FT8 at various output power levels. I used a laser thermometer to
check the temperature of the conductor in multiple places, and it only
showed a tiny increase in temperature above room temp when I tried it with
100W. (KX3 + KXPA100) It was easily tuned on the bands I expected to use it
with, and with the internal tuner of the amp I managed to tune it on 80m,
but didn't expect any significant efficiency, and was right not to expect
it. But on 40m through 10m it was very serviceable. I'm in the Philly area,
and managed to have FT8 contacts as far as Fargo, ND and a couple in Cuba.
The bandwidth was fairly wide as I expected. I haven't used it to try and
make CW or SSB contacts, but I see no reason why I couldn't, though it is
firmly in the "compromise antenna" category for those emission types. It's
a proof-of-concept, mostly, but a functional one.

I've attached pictures, so you can see what it looks like.

-=-=-=-=-=-=-=-=-
73,
Gwen, NG3P


On Wed, Jan 20, 2021 at 10:50 AM Raymond Sills via Elecraft <
elecraft@mailman.qth.net> wrote:

> Hi Group:
> OK... here's my mag loop story:
> I have two AlexLoops and one is the original version that uses copper
> tubing for the main loop.  I used that loop to make an RTTY QSO with a
> station in Moldova.  I had set the loop up indoors (in my sunroom, which
> has a lot of windows) and worked that station on 40 meters... running 3 or
> 4 watts.
> OK, it was during a contest... the contact was quick, but acknowledged
> both ways... so a Q is a Q.And, that was my best DX with that antenna.  The
> fact that it was 40 meters, the loop's least efficient band, is amazing to
> me.  I suspect that the other guy was using a much better antenna, and
> likely more power.
> 73 de RayK2ULRKX3 #211
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to ard...@gmail.com
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

[Elecraft] SSB Net 1-17-2021

[Eric Lanzl]

Here is the list of stations checking in to the 20m net. Thank you to the relay 
stations.The 20 m net meets on Sundays at 1800Z on 14.303.5 alternate is 
14.310. Everyone is welcome.Eric WB9JNZ


| 
Call 
 | 
Name 
 | 
State 
 | 
Radio 
 | 
Serial # 
 | 
QRP 
 | 
Notes 
 |
| 
WB9JNZ 
 | 
Eric 
 | 
IL 
 | 
K3 
 | 
4017 
 | 
 
 | 
Net Control 
 |
| 
NC0JW 
 | 
Jim 
 | 
CO 
 | 
KX3 
 | 
1356 
 | 
 
 | 
Relay Station 
 |
| 
K8NU 
 | 
Carl 
 | 
OH 
 | 
K3S 
 | 
10996 
 | 
 
 | 
 
 |
| 
KB9AVO 
 | 
Paul 
 | 
IN 
 | 
K3S 
 | 
11103 
 | 
 
 | 
 
 |
| 
N7JFF 
 | 
Jeff 
 | 
MT 
 | 
Icom 
 | 
7300 
 | 
 
 | 
 
 |
| 
KO5V 
 | 
Jim 
 | 
NM 
 | 
K2/100 
 | 
7225 
 | 
 
 | 
Relay Station 
 |
| 
W9MNC 
 | 
Mike 
 | 
FL 
 | 
K3S 
 | 
11864 
 | 
 
 | 
 
 |
| 
AD5YW 
 | 
Len 
 | 
NM 
 | 
KX2 
 | 
3964 
 | 
 
 | 
 
 |
| 
NS7P 
 | 
Phil 
 | 
OR 
 | 
K3 
 | 
1826 
 | 
 
 | 
 
 |
| 
ZL1PWD 
 | 
Peter 
 | 
NZ 
 | 
K3 
 | 
139 
 | 
 
 | 
 
 |
| 
AE6JV 
 | 
Bill 
 | 
NH 
 | 
K3 
 | 
6299 
 | 
 
 | 
 
 |
| 
N4NRW 
 | 
Roger 
 | 
SC 
 | 
K3 
 | 
1318 
 | 
 
 | 
Relay Station 
 |
| 
W9EJB 
 | 
Ed 
 | 
IN 
 | 
K3 
 | 
1593 
 | 
 
 | 
 
 |
| 
K4AMQ 
 | 
Alan 
 | 
TN 
 | 
K3S 
 | 
10917 
 | 
 
 | 
 
 |
| 
NY9H 
 | 
Bill 
 | 
PA 
 | 
K3 
 | 
2244 
 | 
 
 | 
 
 |
| 
KS6F 
 | 
Guy  
 | 
CA 
 | 
K3S 
 | 
10650 
 | 
 
 | 
 
 |
| 
KM4ESU 
 | 
Tim 
 | 
AL 
 | 
KX2 
 | 
0 
 | 
 
 | 
 
 |
| 
VE7XTA 
 | 
Tom 
 | 
BC 
 | 
K3S 
 | 
10393 
 | 
 
 | 
 
 |
| 
WM6P 
 | 
Steve 
 | 
GA 
 | 
K3S 
 | 
11453 
 | 
 
 | 
Relay Station 
 |
| 
K6YD 
 | 
Kevin 
 | 
CA 
 | 
Icom 
 | 
7300 
 | 
 
 | 
 
 |
| 
K7BRR 
 | 
Bill 
 | 
AZ 
 | 
Yaesu 
 | 
FTDX 101MP 
 | 
 
 | 
 
 |
| 
W7QHD 
 | 
Kurt 
 | 
AZ 
 | 
K2/100 
 | 
1538 
 | 
 
 | 
 
 |
| 
N7GOD 
 | 
Galen 
 | 
AZ 
 | 
K2 
 | 
6533 
 | 
 
 | 
 
 |
| 
AC8UC 
 | 
Ray 
 | 
OH 
 | 
Icom  
 | 
7410 
 | 
KPA 500 
 | 
 
 |
| 
AB7CE 
 | 
Roy 
 | 
MT 
 | 
K2/100 
 | 
40 
 | 
 
 | 
 
 |


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Efficiency of MFJ remotely-tuned loop antennas

[Augie "Gus" Hansen]

On 1/19/2021 8:20 PM, Andy Durbin wrote:

A couple of people expressed an interest so here is a link to a presentation on 
my mag loop.   It's a while since the presentation was given but the loop is 
still in service in the gamma match configuration.

https://www.dropbox.com/s/5va4ygzbd410le4/Prototype%20Magnetic%20Loop%20rev%20-.pdf?dl=0


Nice job Andy. Looks like we've both had some fun with these antennas 
that have become quite popular in recent years.


My interest in Mag Loop antennas started back in the early 1980s, and I 
have designed and built a couple of dozen over the years since, mostly 
as experiments to gain knowledge and experience, and several to help 
friends who lived under extreme antenna restrictions.


The two pictures in this Dropbox folder show one incarnation of a mag 
loop that uses flat mill stock for the main loop, and a trombone-style 
capacitor for tuning:


https://www.dropbox.com/sh/gqbzz60bcwkc54h/AACAjWK6JFfyLN9qcvq9oSrqa?dl=0

My capacitor design uses PEXX tubing for the dielectric layer (must be 
protected from UV), and has fiberglass stiffeners inside the sliding 
part. The PEXX allowed me to run up to about 300 watts. And the 
stiffeners hold the tubes in line at the low capacity end of travel to 
prevent misalignment (sloppy tuning).


I long ago moved to all copper loops and vacuum variables to handle high 
power and obtain better efficiency. An example of a two-turn version of 
a 40-80m mag loop is on my QRZ.com page:


    https://www.qrz.com/db/KB0YH

It uses 7/8" Heliax (the shield) as the main loop conductor. Kinda 
heavy, so some of my newer mag loops use 1/2" Heliax or soft copper 
tubing instead. Performance suffers a little, but no one notices the 
difference.


Have fun and keep safe.

Gus Hansen
KB0YH





__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K3 PSK31 transmit at what power out?

[Ian Kahn]

I used to run PSK31 on my K3 at 25-30 watts with no issues, no breaks
needed.

Ian, NV4C

On Wed, Jan 20, 2021, 11:35 AM John McBride  wrote:

> My K3 is working well on PSK31, but I have seen some information about
> operating digital at 25 watts.  Presently I transmit at 25 watts with great
> success. The comments are that at that low power the fan may not keep the
> equipment cool enough. One suggestion was to transmit at a higher power,
> and another was to schedule a break every few minutes to allow the rig to
> cool. I will appreciate you sharing any information or experience you have.
> I am getting ready for Winter Field Day and hope to make many PSK31
> contacts.
>
> 
> From: elecraft-boun...@mailman.qth.net 
> on behalf of elecraft-requ...@mailman.qth.net <
> elecraft-requ...@mailman.qth.net>
> Sent: Tuesday, January 19, 2021 5:56 PM
> To: elecraft@mailman.qth.net 
> Subject: Elecraft Digest, Vol 201, Issue 26
>
> Send Elecraft mailing list submissions to
> elecraft@mailman.qth.net
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.qth.net/mailman/listinfo/elecraft
> or, via email, send a message with subject or body 'help' to
> elecraft-requ...@mailman.qth.net
>
> You can reach the person managing the list at
> elecraft-ow...@mailman.qth.net
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Elecraft digest..."
>
>
> Today's Topics:
>
>1. Re: K4 Receive Filter question (David Box)
>2. Re: K4 Receive Filter question (George Thornton)
>3. Re: K4 Receive Filter question (Louandzip)
>4. Re: K4 Receive Filter question (Wes)
>5. Re: Efficiency of MFJ remotely-tuned loop antennas (Fred Jensen)
>6.  Absurd remarks about FCC and ARRL notices. (Joseph Shuman)
>7. Re: Absurd remarks about FCC and ARRL notices. (kennedyjp)
>8. Re: Absurd remarks about FCC and ARRL notices. (Al London)
>9. Re: Absurd remarks about FCC and ARRL notices. (Wayne Burdick)
>   10. Something different, old memories and using the KX3 (Paul GACEK)
>   11. Re: Something different, old memories and using the KX3
>   (Dave Sublette)
>   12. Re: Absurd remarks about FCC and ARRL notices. (h...@optilink.us)
>   13. Re: Efficiency of MFJ remotely-tuned loop antennas (Alan Bloom)
>   14. Re: Efficiency of MFJ remotely-tuned loop antennas (Louandzip)
>   15. Re: Absurd remarks about FCC and ARRL notices. (Barry)
>   16. Re: Efficiency of MFJ remotely-tuned loop antennas (Eric Garner)
>
>
> --
>
> Message: 1
> Date: Tue, 19 Jan 2021 12:51:52 -0600
> From: David Box 
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K4 Receive Filter question
> Message-ID: <8046aaba-68e7-1624-2902-6a37718c4...@suddenlink.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Bruce,
>
> Below are the receiver sensitivity specs from page 42 of the recently
> updated manual
>
>
> Sensitivity??? (MDS)
>
> (Typical??? values;??? main??? or
> sub??? RX,??? BW??? =??? 500??? Hz)
>
> 0.1-1.5??? MHz*:??? ??? ??? ??? Preamp??? OFF/1/2: -120/-130/-135??? ???
> dBm
> 1.5-23??? MHz:??? ??? ??? ??? ??? ??? ??? Preamp??? OFF/1/2: ???
> -120/-132/-137??? dBm
> 23-54??? MHz:??? ??? ??? ??? ??? ??? ??? ??? Preamp??? OFF/1/2: ??? ???
> -120/-132/-141??? dBm
> *0.1-1.5??? MHz??? MDS??? measured??? at??? RX??? antenna inputs.??? When
> using??? shared??? RX/TX??? antenna,??? sensitivity decreases???
> below??? 1.5
> MHz??? due??? to??? intentional??? high-pass??? response??? of T-R???
> switch.
>
>
> de Dave K5MWR
>
> On 1/19/2021 12:40, BRUCE WW8II wrote:
> > I work in the 2 to 3 db above the noise floor CW, and 6 to 10 db above
> the
> > noise floor on SSB now, (that is why I presently own a K3s and a P3VGA)
> so
> > I guess I will have to wait for the real answer. I really cannot
> > believe that Elecraft did not run their own test. If and when I spend my
> > cash I am not looking for the pretty blinkie colored lights and a fancy
> > screen, I want performance.  My really big issue is: receiver noise
> floor,
> > sensitivity and DSP that does not distort or degrade the incoming signal.
> >   But thank all of you for your input  and I truly appreciate all the
> > comments.
> >
> > Bruce
> > WW8II
> >
> >
> >
> > On Tue, Jan 19, 2021 at 10:43 AM Louandzip via Elecraft <
> > elecraft@mailman.qth.net> wrote:
> >
> >>   That's not a simple or easy question to answer, especially since
> there's
> >> been no independent test of a K4, and there are many different criteria
> >> that go into it.  That said,  I'll go out on a limb and say that in most
> >> all practical situations on the air, it won't be. I say that because
> I've
> >> listened to and half-assedly compared a number of very good radios and
> some
> >> less good radios on the air. They might sound different, and take some
> >> tweaking of the controls to make them 

Re: [Elecraft] Efficiency of MFJ remotely-tuned loop antennas

[Andy Durbin]

"I wonder if the SWR runaway at 150W could be due to the PVC pipe used as
the insulator for the variable capacitor?  PVC is quite lossy at RF.
Perhaps when it gets hot it detunes the capacitor.  It would be easy to
check by simply feeling the cap to see if it gets warm."

The insulator/dielectric is PEX not PVC.   I have studied the impact of 
temperature on the antenna and it exhibits some interesting and sometimes 
non-intuitive effects.  The biggest change is seen when the sun hits the 
antenna soon after run rise.   Study of heating during TX would require 
sensitive thermal imaging.  There is no change detectable by touch after a TX.  
Touching it while transmitting would be counter productive and perhaps painful.

I have lots of notes and some plots of the thermal characteristics.  Maybe I'll 
get back to working on it one day.

73,
Andy, k3wyc

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

[Elecraft] K3 PSK31 transmit at what power out?

[John McBride]

My K3 is working well on PSK31, but I have seen some information about 
operating digital at 25 watts.  Presently I transmit at 25 watts with great 
success. The comments are that at that low power the fan may not keep the 
equipment cool enough. One suggestion was to transmit at a higher power, and 
another was to schedule a break every few minutes to allow the rig to cool. I 
will appreciate you sharing any information or experience you have. I am 
getting ready for Winter Field Day and hope to make many PSK31 contacts.


From: elecraft-boun...@mailman.qth.net  on 
behalf of elecraft-requ...@mailman.qth.net 
Sent: Tuesday, January 19, 2021 5:56 PM
To: elecraft@mailman.qth.net 
Subject: Elecraft Digest, Vol 201, Issue 26

Send Elecraft mailing list submissions to
elecraft@mailman.qth.net

To subscribe or unsubscribe via the World Wide Web, visit
http://mailman.qth.net/mailman/listinfo/elecraft
or, via email, send a message with subject or body 'help' to
elecraft-requ...@mailman.qth.net

You can reach the person managing the list at
elecraft-ow...@mailman.qth.net

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Elecraft digest..."


Today's Topics:

   1. Re: K4 Receive Filter question (David Box)
   2. Re: K4 Receive Filter question (George Thornton)
   3. Re: K4 Receive Filter question (Louandzip)
   4. Re: K4 Receive Filter question (Wes)
   5. Re: Efficiency of MFJ remotely-tuned loop antennas (Fred Jensen)
   6.  Absurd remarks about FCC and ARRL notices. (Joseph Shuman)
   7. Re: Absurd remarks about FCC and ARRL notices. (kennedyjp)
   8. Re: Absurd remarks about FCC and ARRL notices. (Al London)
   9. Re: Absurd remarks about FCC and ARRL notices. (Wayne Burdick)
  10. Something different, old memories and using the KX3 (Paul GACEK)
  11. Re: Something different, old memories and using the KX3
  (Dave Sublette)
  12. Re: Absurd remarks about FCC and ARRL notices. (h...@optilink.us)
  13. Re: Efficiency of MFJ remotely-tuned loop antennas (Alan Bloom)
  14. Re: Efficiency of MFJ remotely-tuned loop antennas (Louandzip)
  15. Re: Absurd remarks about FCC and ARRL notices. (Barry)
  16. Re: Efficiency of MFJ remotely-tuned loop antennas (Eric Garner)


--

Message: 1
Date: Tue, 19 Jan 2021 12:51:52 -0600
From: David Box 
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K4 Receive Filter question
Message-ID: <8046aaba-68e7-1624-2902-6a37718c4...@suddenlink.net>
Content-Type: text/plain; charset=utf-8; format=flowed

Bruce,

Below are the receiver sensitivity specs from page 42 of the recently
updated manual


Sensitivity??? (MDS)

(Typical??? values;??? main??? or
sub??? RX,??? BW??? =??? 500??? Hz)

0.1-1.5??? MHz*:??? ??? ??? ??? Preamp??? OFF/1/2: -120/-130/-135??? ???
dBm
1.5-23??? MHz:??? ??? ??? ??? ??? ??? ??? Preamp??? OFF/1/2: ???
-120/-132/-137??? dBm
23-54??? MHz:??? ??? ??? ??? ??? ??? ??? ??? Preamp??? OFF/1/2: ??? ???
-120/-132/-141??? dBm
*0.1-1.5??? MHz??? MDS??? measured??? at??? RX??? antenna inputs.??? When
using??? shared??? RX/TX??? antenna,??? sensitivity decreases???
below??? 1.5
MHz??? due??? to??? intentional??? high-pass??? response??? of T-R???
switch.


de Dave K5MWR

On 1/19/2021 12:40, BRUCE WW8II wrote:
> I work in the 2 to 3 db above the noise floor CW, and 6 to 10 db above the
> noise floor on SSB now, (that is why I presently own a K3s and a P3VGA)  so
> I guess I will have to wait for the real answer. I really cannot
> believe that Elecraft did not run their own test. If and when I spend my
> cash I am not looking for the pretty blinkie colored lights and a fancy
> screen, I want performance.  My really big issue is: receiver noise floor,
> sensitivity and DSP that does not distort or degrade the incoming signal.
>   But thank all of you for your input  and I truly appreciate all the
> comments.
>
> Bruce
> WW8II
>
>
>
> On Tue, Jan 19, 2021 at 10:43 AM Louandzip via Elecraft <
> elecraft@mailman.qth.net> wrote:
>
>>   That's not a simple or easy question to answer, especially since there's
>> been no independent test of a K4, and there are many different criteria
>> that go into it.  That said,  I'll go out on a limb and say that in most
>> all practical situations on the air, it won't be. I say that because I've
>> listened to and half-assedly compared a number of very good radios and some
>> less good radios on the air. They might sound different, and take some
>> tweaking of the controls to make them sound a similar as possible, but in
>> the end I couldn't copy sigs better on one than the other. The K3 is really
>> good in the tests, and I'm confident the K4 will surpass it, but that's at
>> level that will only matter in what I consider to be exceptional
>> circumstances.
>>
>> I'll add that I'm not the radio connoisseur that some are, and what I feel
>> is largely the same, others 

[Elecraft] Mag Loop

[Raymond Sills via Elecraft]

Hi Group:
OK... here's my mag loop story:
I have two AlexLoops and one is the original version that uses copper 
tubing for the main loop.  I used that loop to make an RTTY QSO with a station 
in Moldova.  I had set the loop up indoors (in my sunroom, which has a lot of 
windows) and worked that station on 40 meters... running 3 or 4 watts.
OK, it was during a contest... the contact was quick, but acknowledged both 
ways... so a Q is a Q.And, that was my best DX with that antenna.  The fact 
that it was 40 meters, the loop's least efficient band, is amazing to me.  I 
suspect that the other guy was using a much better antenna, and likely more 
power.
73 de Ray    K2ULR    KX3 #211    
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Efficiency of MFJ remotely-tuned loop antennas

[Alan Bloom]

I love to see people doing serious homebrew.  Bravo!

I wonder if the SWR runaway at 150W could be due to the PVC pipe used as 
the insulator for the variable capacitor?  PVC is quite lossy at RF.  
Perhaps when it gets hot it detunes the capacitor.  It would be easy to 
check by simply feeling the cap to see if it gets warm.


Alan N1AL


On 1/19/2021 5:39 PM, Andy Durbin wrote:

"although I saw a design not long ago that used two coaxial copper pipes with a PVC 
pipe as the insulator.  The inside conductor was mounted to a long threaded rod moving it 
in and out of the outer conductor."

Not my original idea but that's what I have on my loop (PEX insulator not PVC). 
 Works fine up to 100 W on 30 m but has SWR runaway at 150 W.   Capacitor is 
driven by a geared DC motor and is tuned from the shack.  Home brew is far more 
fun than buying commercial.

I'll post a link to a presentation if there is any interest.

Andy, k3wyc
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to a...@elecraft.com


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com