Re: [Elecraft] SS Amp

[Peter Hall]

Folks,

This is an interesting discussion because it's clearly a comparison that 
potential buyers will do - as I did.  In the end, I opted for the Elecraft 
KPA1500 because I wanted the cleanest solid state base station amplifier I 
could reasonably buy.  I wasn't impressed with the SPE IMD results (at least at 
the time I was looking) but, that said, I was (and am) at a loss to actually 
find any published KPA1500 distortion specs.  In fact, I find it a curious 
omission in the Elecraft brochure or manual. If I'm missing a reference 
somewhere, I'd appreciate a pointer to the specs.

As Darrell mentioned, the more flexible switching of the SPE amplifiers is a 
definite plus and quite seductive.

Since obtaining my KPA1500 I've been pleased with it and have done my own IMD 
measurements using the best exciter I can round up, namely my 50-year old 
Collins 32S-3.  I'm generally pleased with my choice of amplifier but look 
forward to using it with a predistortion system (e.g. PureSignal) once that 
spreads beyond the ANAN camp. With any luck, I might even end up with a system 
that improves on the 50-year old 32S-3/30L-1 combination 😊

73, Peter (VK6HP)

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of AB2E Darrell
Sent: Thursday, 17 January 2019 1:43 PM
To: Dave ; Dave 
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] SS Amp

Greetings all,
Depends on your use, if you plan to travel and operate on an island etc, then 
hands down the SPE 1.5K or 1.3k.
Looks like most on the list are more concerned for a home amp, and kpa1500 is 
obviously a great choice too. I just received my SPE 1.5K a couple weeks ago, 
and prior to that had the 1.3 for 3 yrs. For travel the spe means several less 
boxes to take...virtually self-contained with the 4 autoselect antenna ports, 
legal limit ATU, and 2 rig inputs, and autoselect power supply ( will detect 
120v or 240v like a laptop does).
I have an Acom 2000a also in service at home.
All of these amps work great with my k3, like someone else mentioned dont 
forget to go to each band and lower power if you have low drive 1.3spe (the 
1.5k takes regular drive (25 to 30w on mine).
73
Darrell AB2E

From: elecraft-boun...@mailman.qth.net  on 
behalf of Dave 
Sent: Wednesday, January 16, 2019 9:23:44 PM
To: Dave
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] SS Amp

- The KPA1500 has two LDMOS devices vs one in the SPE.
- The 1500 has better IMD specs and better duty cycle than the SPE.
- The KPA1500 has a separate power supply that can be located under the desk.
- KPA1500 has Ethernet remote capability.

Dave wo2x

Sent from my iPad

> On Jan 16, 2019, at 9:06 PM, Dave  wrote:
>
> I’m trying to decide on a SS amp. I already have the KPA500 and love it but 
> the price for the KPA1500 is a bit above my budget. I am looking at the SPE 
> 1.5K-FA which is about $1000 less. I like the fact that it has inputs for two 
> radios and 4 antenna connections. Plus the power supply is built into the 
> same box.  I know the response from this list will be pro Elecraft but any 
> constructive or informative comments would be appreciated.
>
> Tnx es 73,
> Dave N8AG
>
>
> Sent from Mail for Windows 10
>
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Re: [Elecraft] SS Amp

[AB2E Darrell]

Greetings all,
Depends on your use, if you plan to travel and operate on an island etc, then 
hands down the SPE 1.5K or 1.3k.
Looks like most on the list are more concerned for a home amp, and kpa1500 is 
obviously a great choice too. I just received my SPE 1.5K a couple weeks ago, 
and prior to that had the 1.3 for 3 yrs. For travel the spe means several less 
boxes to take...virtually self-contained with the 4 autoselect antenna ports, 
legal limit ATU, and 2 rig inputs, and autoselect power supply ( will detect 
120v or 240v like a laptop does).
I have an Acom 2000a also in service at home.
All of these amps work great with my k3, like someone else mentioned dont 
forget to go to each band and lower power if you have low drive 1.3spe (the 
1.5k takes regular drive (25 to 30w on mine).
73
Darrell AB2E

From: elecraft-boun...@mailman.qth.net  on 
behalf of Dave 
Sent: Wednesday, January 16, 2019 9:23:44 PM
To: Dave
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] SS Amp

- The KPA1500 has two LDMOS devices vs one in the SPE.
- The 1500 has better IMD specs and better duty cycle than the SPE.
- The KPA1500 has a separate power supply that can be located under the desk.
- KPA1500 has Ethernet remote capability.

Dave wo2x

Sent from my iPad

> On Jan 16, 2019, at 9:06 PM, Dave  wrote:
>
> I’m trying to decide on a SS amp. I already have the KPA500 and love it but 
> the price for the KPA1500 is a bit above my budget. I am looking at the SPE 
> 1.5K-FA which is about $1000 less. I like the fact that it has inputs for two 
> radios and 4 antenna connections. Plus the power supply is built into the 
> same box.  I know the response from this list will be pro Elecraft but any 
> constructive or informative comments would be appreciated.
>
> Tnx es 73,
> Dave N8AG
>
>
> Sent from Mail for Windows 10
>
> __
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Re: [Elecraft] SS Amp

[Barry Simpson]

Hi Dave

I had an SPE 1.5KFA for a few months.

I have also owned a KPA500 for around 4 or 5 years.

Despite the publicity blurb that says the SPE QSK is silent, it isn't. The
relay is quite noisy - at least if you are used to the totally silent
KPA500.

It is also difficult to control power wise. I wanted to run it at around
400 watts and for that you only need about 8 or 9 watts of drive so it is
difficult to control accurately.

I also found an unexpected quirk whereby using the amplifier affected my
transformer (not switch mode) in my Alinco 30A 12V power supply. In
sympathy with the keying, the transformer in the PSU kept making a groaning
noise that I have never had before. I have surmised that as the SPE has
power factor correction circuitry, that is somehow interacting with the
transformer. I didn't get the same effect with various switch mode power
supplies.

At the end of the day, I decided that the SPE was not for me and I sold it.
I much prefer the KPA500.

If you don't want the KPA1500 there is a very nice looking solid state amp
made in the UK by Linear Amp, the Gemini HF 1K. It has some really good
reviews on eHam and it appears to have silent QSK.

73

Barry  VK2BJ

On Thu, 17 Jan 2019 at 13:06, Dave  wrote:

> I’m trying to decide on a SS amp. I already have the KPA500 and love it
> but the price for the KPA1500 is a bit above my budget. I am looking at the
> SPE 1.5K-FA which is about $1000 less. I like the fact that it has inputs
> for two radios and 4 antenna connections. Plus the power supply is built
> into the same box.  I know the response from this list will be pro Elecraft
> but any constructive or informative comments would be appreciated.
>
> Tnx es 73,
> Dave N8AG
>
>
> Sent from Mail for Windows 10
>
> __
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Re: [Elecraft] SS Amp

[Joe Subich, W4TV]

On 2019-01-16 9:39 PM, j...@kk9a.com wrote:

I do not recall reading what transistor(s) it uses or know how loud
it is or what the IMD is.


The SPE 1.5 uses a single LDMOS device.  While it can produce 1500W
with sufficient drive, it starts to compress well before the 1000 W
level.  SPE's own test data supplied to the FCC showed very poor IMD
characteristics - what one would call a distortion generator - at
"full" power.

73,

   ... Joe, W4TV


On 2019-01-16 9:39 PM, j...@kk9a.com wrote:

The one piece 10kg lightweight design and a multi-voltage power supply make
the SPE 1.5k-fa very nice for travel. I do not recall reading what
transistor(s) it uses or know how loud it is or what the IMD is.  The
Elecraft KPA-1500 is pretty heavy-duty and of course well supported in the
U.S.

John KK9A


Dave n8ag at comcast.net

I'm trying to decide on a SS amp. I already have the KPA500 and love it but
the price for the KPA1500 is a bit above my budget. I am looking at the SPE
1.5K-FA which is about $1000 less. I like the fact that it has inputs for
two radios and 4 antenna connections. Plus the power supply is built into
the same box.  I know the response from this list will be pro Elecraft but
any constructive or informative comments would be appreciated.

Tnx es 73,
Dave N8AG


Sent from Mail for Windows 10




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Re: [Elecraft] SS Amp

[Art Greenberg]

I have the 1.5K-FA. I like it. I am not heavily into contesting and I'm not 
a competitive DXer.


Yes,  it's less expensive than the KPA1500. It also doesn't integrate as 
well with the K3. It doesn't control the K3's output power when switching 
between standby and operate. One needs to remember to do that, especially 
when switching into operate mode on the amp - massive overdrive isn't 
pretty and could damage the amplifier.


It doesn't remote as well as the KPA1500, either. It comes with a software 
control panel that runs on Windows. I use VNC to control the amp when 
operating remote.


Art
WA2LLN

On January 16, 2019 21:09:45 Dave  wrote:

I’m trying to decide on a SS amp. I already have the KPA500 and love it but 
the price for the KPA1500 is a bit above my budget. I am looking at the SPE 
1.5K-FA which is about $1000 less. I like the fact that it has inputs for 
two radios and 4 antenna connections. Plus the power supply is built into 
the same box.  I know the response from this list will be pro Elecraft but 
any constructive or informative comments would be appreciated.


Tnx es 73,
Dave N8AG


Sent from Mail for Windows 10

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Re: [Elecraft] SS Amp

[W2xj]

Well you have an Italian amp with one man US support. That one man appears to 
be at least in his 80s. In my world (broadcast) many of us avoid Italian 
products. YMMV and you get what you pay for. 

Sent from my iPad

> On Jan 16, 2019, at 9:06 PM, Dave  wrote:
> 
> I’m trying to decide on a SS amp. I already have the KPA500 and love it but 
> the price for the KPA1500 is a bit above my budget. I am looking at the SPE 
> 1.5K-FA which is about $1000 less. I like the fact that it has inputs for two 
> radios and 4 antenna connections. Plus the power supply is built into the 
> same box.  I know the response from this list will be pro Elecraft but any 
> constructive or informative comments would be appreciated.
> 
> Tnx es 73,
> Dave N8AG
> 
> 
> Sent from Mail for Windows 10
> 
> __
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[Elecraft] SS Amp

[john]

The one piece 10kg lightweight design and a multi-voltage power supply make
the SPE 1.5k-fa very nice for travel. I do not recall reading what
transistor(s) it uses or know how loud it is or what the IMD is.  The
Elecraft KPA-1500 is pretty heavy-duty and of course well supported in the
U.S.

John KK9A


Dave n8ag at comcast.net 

I'm trying to decide on a SS amp. I already have the KPA500 and love it but
the price for the KPA1500 is a bit above my budget. I am looking at the SPE
1.5K-FA which is about $1000 less. I like the fact that it has inputs for
two radios and 4 antenna connections. Plus the power supply is built into
the same box.  I know the response from this list will be pro Elecraft but
any constructive or informative comments would be appreciated.

Tnx es 73,
Dave N8AG


Sent from Mail for Windows 10

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Re: [Elecraft] SS Amp

[Dave]

- The KPA1500 has two LDMOS devices vs one in the SPE. 
- The 1500 has better IMD specs and better duty cycle than the SPE.
- The KPA1500 has a separate power supply that can be located under the desk.
- KPA1500 has Ethernet remote capability.

Dave wo2x

Sent from my iPad

> On Jan 16, 2019, at 9:06 PM, Dave  wrote:
> 
> I’m trying to decide on a SS amp. I already have the KPA500 and love it but 
> the price for the KPA1500 is a bit above my budget. I am looking at the SPE 
> 1.5K-FA which is about $1000 less. I like the fact that it has inputs for two 
> radios and 4 antenna connections. Plus the power supply is built into the 
> same box.  I know the response from this list will be pro Elecraft but any 
> constructive or informative comments would be appreciated.
> 
> Tnx es 73,
> Dave N8AG
> 
> 
> Sent from Mail for Windows 10
> 
> __
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Re: [Elecraft] SS Amp

[Michael Walker]

What about https://rf-kit.de/en/

I’ve used mine for about a year now. 

Mike va3mw

Sent from my iPad

> On Jan 16, 2019, at 9:06 PM, Dave  wrote:
> 
> I’m trying to decide on a SS amp. I already have the KPA500 and love it but 
> the price for the KPA1500 is a bit above my budget. I am looking at the SPE 
> 1.5K-FA which is about $1000 less. I like the fact that it has inputs for two 
> radios and 4 antenna connections. Plus the power supply is built into the 
> same box.  I know the response from this list will be pro Elecraft but any 
> constructive or informative comments would be appreciated.
> 
> Tnx es 73,
> Dave N8AG
> 
> 
> Sent from Mail for Windows 10
> 
> __
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[Elecraft] SS Amp

[Dave]

I’m trying to decide on a SS amp. I already have the KPA500 and love it but the 
price for the KPA1500 is a bit above my budget. I am looking at the SPE 1.5K-FA 
which is about $1000 less. I like the fact that it has inputs for two radios 
and 4 antenna connections. Plus the power supply is built into the same box.  I 
know the response from this list will be pro Elecraft but any constructive or 
informative comments would be appreciated.

Tnx es 73,
Dave N8AG


Sent from Mail for Windows 10

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Re: [Elecraft] Do the KPA/KAT500 PowerCombo Application Notes regarding Yaesu radios describe how a 10-pin DIN/15-pin serial cable should be wired to implement Enhanced Mode coordinated band switching

[Jim Brown]

James,

As  a long time KPA500 and KAT500 user, I've never seen the need for any 
such connection between the rig and the amp. All it takes is a dit or a 
tap on the mic, and the both are ready to go. The only connections that 
ARE required is the pull to ground to put the amp in TX mode that loops 
through the RCA connectors on the KAT500. That is, Key Out from the rig 
to one RCA on the tuner, and RCA-RCA jumper from the other RCA to the amp.


73, Jim K9YC

On 1/16/2019 1:34 PM, James Dahl wrote:

Do the KPA/KAT500 PowerCombo Application Notes regarding Yaesu radios describe 
how a 10-pin DIN/15-pin serial cable should be wired to implement Enhanced Mode 
coordinated band switching from the radio without the need to transmit (as 
opposed to Basic Mode automatic band switching when RF is applied)?



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Re: [Elecraft] KX2 Filter Bandwidth issue - Resolved

[Bob McGraw K4TAX]

I have experienced issues where a computer and the application software 
left fragments of data in the radio.  Not specific to the KX2 but could 
be.   From your description it seems the radio was in FSK mode.  That 
performs as you described which is a function of APF.


I have found in most cases it is best to close the software application 
before turning off the radio.  Then turn off the radio and then shut 
down the power supply, then shut down the computer. Power up in the 
reverse sequence; computer completely booted, power supply on, turn on 
the radio, then load / open the application software.


One other issue which has been shown to leave corrupt data in the radio 
is when the power supply is shut down before the radio is turned off.   
The radio has no chance to save any recent data or configuration.  
Always turn off the radio first and then the power supply.


73

Bob, K4TAX

On 1/16/2019 5:07 PM, Corky wrote:

I reviewed everything (displays and filter settings) and everything looked to be fine, 
but it was still behaving strangely. As a last attempt, with system set to Data A (as it 
was previously) I engaged the filter adjust mode and then use the dial to set 
"norm" for the mode. All of a sudden it worked as expected! So I am not sure 
what was funky - perhaps vestiges of a previous RTTY setup or something, but now is 
working fine.

Thanks and 73,
-Corky, AF4PM



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Re: [Elecraft] Battery Low K3

[Bob McGraw K4TAX]

Perhaps someone will come up with  petite or very tiny jumper cables.  
That might solve the Low Battery issue.   Maybe a "jumper cable kit".   
  :-)


73

Bob, K4TAX


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Re: [Elecraft] Battery Low K3

[Bert via Elecraft]

Just a suggestion for a battery source: Harbor Freight. I've been using 
CR2032's on my dog's illuminated collar (uses two batteries at a time), and 
they've been outlasting the "name brands" that I'd buy at Home Depot.If you're 
shy about using batteries made out of the country, just check the origins of 
the ones you buy a a local store! The wrapping's from one place (it says 
"distributed by") and the battery from somewhere else.Plus, for a pack of four, 
I paid less than I would for a pack of two of the "name brand"! After replacing 
one in the K3, I now have three more to use on the dog collar! Can't beat that 
with a stick...even better, don't forget to use a coupon if you have one...73, 
Bert N4CW
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[Elecraft] KX2 Bandwidth Issue

[K9MA]

The KX2 (and maybe KX3) has long had an issue that when the filter 
bandwidth is set to x00 Hz, some artifacts appear. Over a year ago, a 
"temporary" fix was introduced, automatically adding 50 Hz to the x00, 
so it can only be set to 350, 450, etc. I know it's a minor thing, but 
I'm rather attached to using 400 Hz. Has anyone heard anything about a fix?


73,

Scott K9MA

--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] KX2 Filter Bandwidth issue - Resolved

[Corky]

I reviewed everything (displays and filter settings) and everything looked to 
be fine, but it was still behaving strangely. As a last attempt, with system 
set to Data A (as it was previously) I engaged the filter adjust mode and then 
use the dial to set "norm" for the mode. All of a sudden it worked as expected! 
So I am not sure what was funky - perhaps vestiges of a previous RTTY setup or 
something, but now is working fine.

Thanks and 73,
-Corky, AF4PM

On Wed, Jan 16, 2019, at 10:33 AM, Carl wrote:
> Corky,
> 
> It sounds like you are in APF-AN mode, like in holding the FIL button 
> too long. I can adjust the width and move the bandpass around OK. Other 
> than that, maybe the software is doing something. I don't have FLDigi. 
> Is the display correct, like on page 12 or like on page 18? Are you in 
> Data A mode?
> 
> Good luck, hope this helped you.
> 
> -- 
> Carl
> AB1DD
> Resistance is futile.
> (don't know about reactance, though)
> 
> 


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[Elecraft] Why do the KPA/KAT500 PowerCombo Application Notes regarding Yaesu radios reference the radio’s LINEAR 10-pin DIN jack when the Elecraft CBL-YAESUKEY Keying Cable is an 8-pin DIN designed f

[James Dahl]

Why do the KPA/KAT500 PowerCombo Application Notes regarding Yaesu radios 
reference the radio’s LINEAR 10-pin DIN jack when the Elecraft CBL-YAESUKEY 
Keying Cable is an 8-pin DIN designed for the radio's TUNER jack?  

https://elecraft.com/pages/mods-notes-alerts 


https://elecraft.com/products/e770060_cbl-yaesukey-yaesu-cable-for-the-kpa500-amp-and-kpa1500-amp
 


https://www.yaesu.com/downloadFile.cfm?FileID=6434&FileCatID=158&FileName=FT-450D_OM_USA_EXP_EU_EH024H250.pdf&FileContentType=application/pdf
 

 


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[Elecraft] Do the KPA/KAT500 PowerCombo Application Notes regarding Yaesu radios describe how a 10-pin DIN/15-pin serial cable should be wired to implement Enhanced Mode coordinated band switching fro

[James Dahl]

Do the KPA/KAT500 PowerCombo Application Notes regarding Yaesu radios describe 
how a 10-pin DIN/15-pin serial cable should be wired to implement Enhanced Mode 
coordinated band switching from the radio without the need to transmit (as 
opposed to Basic Mode automatic band switching when RF is applied)?
https://elecraft.com/pages/mods-notes-alerts 


https://elecraft.com/products/e770060_cbl-yaesukey-yaesu-cable-for-the-kpa500-amp-and-kpa1500-amp
 


https://www.yaesu.com/downloadFile.cfm?FileID=6434&FileCatID=158&FileName=FT-450D_OM_USA_EXP_EU_EH024H250.pdf&FileContentType=application/pdf
 

 


https://elecraft.com/pages/mods-notes-alerts 


https://elecraft.com/products/e770060_cbl-yaesukey-yaesu-cable-for-the-kpa500-amp-and-kpa1500-amp
 


https://www.yaesu.com/downloadFile.cfm?FileID=6434&FileCatID=158&FileName=FT-450D_OM_USA_EXP_EU_EH024H250.pdf&FileContentType=application/pdf
 

 

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Re: [Elecraft] K3s Line Out (stereo)

[KENT TRIMBLE]

Hi Dick . . .

Good to see you on the reflector again.

One "earthly reason" for having four people wear headphones during FD is 
when you are wanting to train new operators.  By monitoring both sides 
of the contact they can better grasp what's going on and practice 
copying the exchanges (especially so for CW students).


We have used both the Behringer AMP800 
(http://www.musictribe.com/Categories/Behringer/Signal-Processors/Headphone-Amplifiers/AMP800/p/P0331) 
and the Rolls HA-43 (http://www.rolls.com/product.php?pid=HA43), and 
both amps work fine at 100 watts with no RFI.


They have also been useful for summertime QRP sprints (e.g., Bumble Bee 
and Skeeter Hunt) where signals, weak to begin with, are further drowned 
out by outdoor noises.  Some QRP rigs don't have speakers and those that 
do are often not usable outdoors.


73,

Kent  K9ZTV





On 1/16/2019 10:47 AM, RIchard Williams via Elecraft wrote:

  Like Walter, I use the Behringer HA-400 with my K3 on Field Day.  You can 
have up to four individuals on headphones (no earthly idea why you would have 
four) ...




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Re: [Elecraft] Control of K3s from computer

[Nr4c]

RS-232 set to USB. 

Sent from my iPhone
...nr4c. bill


> On Jan 16, 2019, at 1:40 PM, Dave Sublette  wrote:
> 
> I had the K3s operating correctly controlling it with an RS232 cable from
> the computer.  When I try to replace that with a USB cable, the radio isn't
> found.  The computer says the port is operating correctly. I'm stumped.
> 
> The software's the N1MM.  I've made an inquiry there.
> 
> Perhaps there is a menu item that needs attention?  I have been through it
> all, but don't recall that there is.
> 
> Any suggestions?
> 
> Dave, K4TO
> 
> ps -- The P3/SVGA is running an external monitor just fine and the control
> path evidently goes through the P3.  I have the proper cable connected.
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Re: [Elecraft] KPA fans in digital modes

[Jim N7US]

The KPA1500's Ethernet port is required to use Larry's program.

I use WiFi to connect my shack computer to the internet and LAN and USB between 
the computer and KPA1500.

Has anyone connected their KPA1500 to a WiFi-connected computer using Ethernet 
between the amplifier and the computer?

Jim N7US

-Original Message-


Eric,

If you'll pardon a little self-promotion, you might consider using FANticipator 
to control the fans in your KAP1500. It's free, runs local or remote, and will 
perform those speed-changing tasks automatically for you... including shutting 
the fans off completely when the amp returns to ambient temperatures.

http://hamprojects.info/fanticipator-kpa1500-console-and-fan-controller/

-larry (K8UT)

-- Original Message --
From: "eric norris via Elecraft" 
To: "elecraft@mailman.qth.net" 
Sent: 2018-12-04 05:39:56
Subject: [Elecraft] KPA fans in digital modes

>I, too, use FAN2 for both the KPA500 and KPA1500 in digital modes.  
>Both amps run considerably cooler and with less thermal variation.
>It would be great if the PF1 or PF2 keys on the KPA1500 could be used 
>to toggle into a preset FAN2 (or choose your poison) when pounding away 
>on digital modes like MSK144 for meteor scatter on 6m.  I don't know if 
>it would be possible to do something similar for one of the keys on the 
>KPA500--perhaps the AUX band switch?  For both amps I switch back to 
>FAN NOR for casual CW use.
>For all of you out there with even a 3el beam and 100w on 6m, please 
>try meteor scatter using MSK144--you can make contacts every day out to 
>1500km or more, even without a clear horizon.  Schedules optional at 
>the Ping Jockey website.  It's a blast!
>73 Eric WD6DBM
>

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Re: [Elecraft] com port setup

[Dave Sublette]

Got it.  Thanks to K4TAX who told me that, yes, indeed there was a menu
item red face...


73,

Dave, k4TO
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Re: [Elecraft] KX2 Filter Bandwidth issue

[Lyle Johnson]

Is the mode DATA A or USB/LSB?  Is USB/LSB (voice SSB) this is normal 
behavior as the radio switches to "3rd method" demodulation.  DATA A 
should not have this behavior.


73,

Lyle KK7P

On 1/16/19 11:06 AM, Corky wrote:

I have been using my KX2 for digital (Fldigi and SignaLink) and am seeing a 
very strange behavior when I attempt to adjust the signal bandwidth. As long as 
the bandwidth is above 2.0 everything works fine. When I reduce it to cut out 
nearby signals the signal on the fldigi waterfall has s gap in the middle and 
two bands, one above and the other below where I am listening.

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Re: [Elecraft] K3s Line Out (stereo)

[Jim Brown]

On 1/16/2019 4:49 AM, K9MA wrote:
I had to add isolation transformers for the same reason the K3 has 
them on the line outputs. 


If you had to add isolation transformers, your station is not properly 
bonded. There is NO good reason for needing transformers if all the 
equipment in a station is properly bonded. 
http://k9yc.com/GroundingAndAudio.pdf


73, Jim K9YC

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[Elecraft] Control of K3s from computer

[Dave Sublette]

I had the K3s operating correctly controlling it with an RS232 cable from
the computer.  When I try to replace that with a USB cable, the radio isn't
found.  The computer says the port is operating correctly. I'm stumped.

The software's the N1MM.  I've made an inquiry there.

Perhaps there is a menu item that needs attention?  I have been through it
all, but don't recall that there is.

Any suggestions?

Dave, K4TO

ps -- The P3/SVGA is running an external monitor just fine and the control
path evidently goes through the P3.  I have the proper cable connected.
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Re: [Elecraft] KX2 Filter Bandwidth issue

[Brian Waterworth]

First thing that comes to mind, is the notch filter on?

Regards
Brian
VE3IBW

On Wed, Jan 16, 2019 at 10:08 AM Corky  wrote:

> I have been using my KX2 for digital (Fldigi and SignaLink) and am seeing
> a very strange behavior when I attempt to adjust the signal bandwidth. As
> long as the bandwidth is above 2.0 everything works fine. When I reduce it
> to cut out nearby signals the signal on the fldigi waterfall has s gap in
> the middle and two bands, one above and the other below where I am
> listening. This cleverly filters out the exact signal I am trying to
> monitor and leaves the signals above and below my 1500 Hz operating point
> still coming through. I have not found any way to fix this, and the same
> settings on either the KX3 or the K2 produce the expected results of a
> single narrowed band around my monitoring point.
>
> Anyone else experienced this or have any suggestions as to how to get the
> desired/expected results when adjusting the receive bandwidth?
>
> Thanks and 73,
> -Corky, AF4PM
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[Elecraft] KX2 Filter Bandwidth issue

[Corky]

I have been using my KX2 for digital (Fldigi and SignaLink) and am seeing a 
very strange behavior when I attempt to adjust the signal bandwidth. As long as 
the bandwidth is above 2.0 everything works fine. When I reduce it to cut out 
nearby signals the signal on the fldigi waterfall has s gap in the middle and 
two bands, one above and the other below where I am listening. This cleverly 
filters out the exact signal I am trying to monitor and leaves the signals 
above and below my 1500 Hz operating point still coming through. I have not 
found any way to fix this, and the same settings on either the KX3 or the K2 
produce the expected results of a single narrowed band around my monitoring 
point.

Anyone else experienced this or have any suggestions as to how to get the 
desired/expected results when adjusting the receive bandwidth?

Thanks and 73,
-Corky, AF4PM
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Re: [Elecraft] K3s Line Out (stereo)

[K9MA]

There's no mystery at all. The headphone outputs of two radios go to a 
switching system with a common ground. There inevitably is a small AC 
voltage difference between the chassis of the two radios, and from the 
radios to the rest of the system ground, which results in some current 
flowing in the headphone cable ground wires. Bonding everything together 
with braid might have helped, but it might have been hard to get the 
impedance low enough. The common ground was an oversight on my part, but 
avoiding it would have required third relay pole and isolated headphone 
jacks. Rather than rebuild the switching system, I inserted the 
transformers. They serve exactly the same purpose as the K3 internal 
ones in the line outputs.


I'm not sure how other SO2R systems deal with the problem, but it has to 
be either isolation transformers of switched headphone grounds. Or, as 
does one of my friends, completely isolated left and right headphones.


73,
Scott K9MA

On 1/16/2019 09:36, Don Wilhelm wrote:
The K3/K3S Line Out already has isolation transformers internal to the 
K3.  I do not understand any need to put additional transformers in 
the audio path(s).


What happens if you cable to LINE OUT signals to a computer soundcard 
(with both left and right channels - some only are one channel if the 
input is set for MIC)?  You should hear the main RX in the left 
channel and the SubRX in the right.


Your external transformers/cabling raises the question of "is it the 
K3S or is it your external devices that are causing the problem".


Time to strip everything down to the essentials and begin to determine 
where the "failure" is occurring.  Test one thing at a time.


73,
Don W3FPR

On 1/15/2019 8:00 PM, Dave Sublette wrote:
My K3s arrived over the weekend and I have been setting it up. I am 
using
the rear Audio jacks to drive either headphones, or the Line out to 
drive

an amplifier and two speakers in the stereo mode.

The headphone jack has stereo output ok.  But the line out only has 
right

channel audio.  Left channel has nothing but a low hum.

I am testing them one at a time, using the same cable. So it is not a 
case
of a bad cable.  The plug inserts to the same depth in both the 
headphone

and line out jacks, so I believe the plug is properly inserted,

I have been through both the Main Menu and Config menus, item by 
item.  I
see nothing that would give the option to turn off the left channel 
of the

line out.


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--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] K3s Line Out (stereo)

[RIchard Williams via Elecraft]

 Like Walter, I use the Behringer HA-400 with my K3 on Field Day.  You can have 
up to four individuals on headphones (no earthly idea why you would have four), 
and each can control the volume to their headsets.  If you have visitors and 
want to use the speaker too, that can be done in the menu setting to have both 
speaker and headphones on.
Never had a problem with RFI, but we are only running the K3 barefoot.   
Dick, K8ZTT
On Wednesday, January 16, 2019, 9:14:54 AM MST, K9MA  
wrote:  
 
 On 1/16/2019 10:00, Walter Underwood wrote:
> When I need to drive two sets of headphones, I use a $25 Behringer HA400 
> headphone distribution amp.
>
> https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30

Any trouble with RFI?

73,

Scott K9MA

-- 
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] Non-Resonant Antennas and Chokes

[Ken]

On 1/16/19 12:11 AM, Wes Stewart wrote:
Why don't you cut the dipole in the center, add an insulator and feed 
it with coax?  Put a CM choke at the feedpoint if you insist and lose 
the ladderline and tuner. _Prune the wire length for resonance. _



You do realize that "pruning" for resonance will rarely give a flat SWR 
and pruning for low SWR does not mean the antenna is resonant?



Of course, if you cut an end fed Zepp and feed it in the center with 
coax, it becomes a single band dipole instead of a multi band antenna.



Ken WA8JXM

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Re: [Elecraft] K3s Line Out (stereo)

[Bob McGraw K4TAX]

I agree but in the case of using two radios, two pair of headphones, a 
switching system and getting hum indicates a serious deficiency in the 
station interconnection and ground scheme. Everything should be at the 
same potential, thus no current would flow.   As they say "sum-tin not 
right".


73

Bob, K4TAX

On 1/16/2019 10:00 AM, Walter Underwood wrote:

When I need to drive two sets of headphones, I use a $25 Behringer HA400 
headphone distribution amp.

https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)



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Re: [Elecraft] K3s Line Out (stereo)

[Walter Underwood]

Haven’t noticed any. It is a simple device, a quad op-amp and four pots in a 
little metal box. It runs off 12 V, so it can plug into the shack supply.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 16, 2019, at 8:14 AM, K9MA  wrote:
> 
> On 1/16/2019 10:00, Walter Underwood wrote:
>> When I need to drive two sets of headphones, I use a $25 Behringer HA400 
>> headphone distribution amp.
>> 
>> https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30
> 
> Any trouble with RFI?
> 
> 73,
> 
> Scott K9MA
> 
> -- 
> Scott  K9MA
> 
> k...@sdellington.us
> 
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Re: [Elecraft] Driving KPAA500 from KX3

[Don Wilhelm]

John,

If the voltage displayed on the KPA500 is within range, nothing has to 
be done.


See page 9 of the KPA500 manual for instructions on checking the voltage.
If the voltage is not in range, change the transformer tap.  See page 8 
of the manual.


73,
Don W3FPR



On 1/15/2019 8:43 PM, John Pierce wrote:

Just got 220v to my shack.  I put the 220V fuses into the KPA500 and
connected the amp to 220v using the ELecraft power cable.  I was expecting
to do something to the transformer wiring in the KPA500, but did not see any
instruction to do so.  Is that all there is to powering the KPA500 from
220vac?

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Re: [Elecraft] K3s Line Out (stereo)

[K9MA]

On 1/16/2019 10:00, Walter Underwood wrote:

When I need to drive two sets of headphones, I use a $25 Behringer HA400 
headphone distribution amp.

https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30


Any trouble with RFI?

73,

Scott K9MA

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Re: [Elecraft] Setting band edges on the K3

[Don Wilhelm]

David,

As I recall, per country band limits must be set at Watsonville, CA or 
an authorized repair facility.
That is done do comply with various country band limits for amateur 
radio transceivers - most notably Japan and some other Asian markets.


Contact supp...@elecraft.com for a definitive answer.

73,
Don W3FPR

On 1/16/2019 10:37 AM, David Woolley wrote:
The UK 5MHz allocation is not a single continuous allocation.  It is 
more like number of spot frequencies with allowances for different 
bandwidths.  Applying frequency fencing would need consideration of 
modes and filters as well as frequency.


In general, I believe that Elecraft set frequency limits based on the 
destination country, although I don't think they can cope with 
essentially spot allocations.


I believe there are ways of changing the allocations in the field, but 
they are not in the public domain and users have to demonstrate 
authorisation for the frequency.



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Re: [Elecraft] K3s Line Out (stereo)

[Walter Underwood]

When I need to drive two sets of headphones, I use a $25 Behringer HA400 
headphone distribution amp.

https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 16, 2019, at 7:36 AM, Don Wilhelm  wrote:
> 
> The K3/K3S Line Out already has isolation transformers internal to the K3.  I 
> do not understand any need to put additional transformers in the audio 
> path(s).
> 
> What happens if you cable to LINE OUT signals to a computer soundcard (with 
> both left and right channels - some only are one channel if the input is set 
> for MIC)?  You should hear the main RX in the left channel and the SubRX in 
> the right.
> 
> Your external transformers/cabling raises the question of "is it the K3S or 
> is it your external devices that are causing the problem".
> 
> Time to strip everything down to the essentials and begin to determine where 
> the "failure" is occurring.  Test one thing at a time.
> 
> 73,
> Don W3FPR
> 
> On 1/15/2019 8:00 PM, Dave Sublette wrote:
>> My K3s arrived over the weekend and I have been setting it up. I am using
>> the rear Audio jacks to drive either headphones, or the Line out to drive
>> an amplifier and two speakers in the stereo mode.
>> The headphone jack has stereo output ok.  But the line out only has right
>> channel audio.  Left channel has nothing but a low hum.
>> I am testing them one at a time, using the same cable. So it is not a case
>> of a bad cable.  The plug inserts to the same depth in both the headphone
>> and line out jacks, so I believe the plug is properly inserted,
>> I have been through both the Main Menu and Config menus, item by item.  I
>> see nothing that would give the option to turn off the left channel of the
>> line out.
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Re: [Elecraft] Setting band edges on the K3

[David Woolley]

The UK 5MHz allocation is not a single continuous allocation.  It is 
more like number of spot frequencies with allowances for different 
bandwidths.  Applying frequency fencing would need consideration of 
modes and filters as well as frequency.


In general, I believe that Elecraft set frequency limits based on the 
destination country, although I don't think they can cope with 
essentially spot allocations.


I believe there are ways of changing the allocations in the field, but 
they are not in the public domain and users have to demonstrate 
authorisation for the frequency.


--
David Woolley
Owner K2 06123

On 16/01/2019 09:08, ANDY NEHAN wrote:

I have searched the manual etc. and cant find a way of setting the band edges. 
By which I mean the frequencies outside of which the transmitter will not 
function. Here in Europe (as elsewhere I believe) different countries have 
different band edges - this is particularly so for the 5MHz band. It would be 
all too easy for me to respond to an FT8 CQ (for example) from a European 
station and find that I was transmitting outside of the UK 5MHz band. OK so I 
can fix my transmit frequency but it would be nicer if I could set band limits.
Have I missed something - is this facility hidden somewhere??
Andy G4HUE, K3, KPA500, KAT500, P3 owner.



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Re: [Elecraft] K3s Line Out (stereo)

[Don Wilhelm]

The K3/K3S Line Out already has isolation transformers internal to the 
K3.  I do not understand any need to put additional transformers in the 
audio path(s).


What happens if you cable to LINE OUT signals to a computer soundcard 
(with both left and right channels - some only are one channel if the 
input is set for MIC)?  You should hear the main RX in the left channel 
and the SubRX in the right.


Your external transformers/cabling raises the question of "is it the K3S 
or is it your external devices that are causing the problem".


Time to strip everything down to the essentials and begin to determine 
where the "failure" is occurring.  Test one thing at a time.


73,
Don W3FPR

On 1/15/2019 8:00 PM, Dave Sublette wrote:

My K3s arrived over the weekend and I have been setting it up. I am using
the rear Audio jacks to drive either headphones, or the Line out to drive
an amplifier and two speakers in the stereo mode.

The headphone jack has stereo output ok.  But the line out only has right
channel audio.  Left channel has nothing but a low hum.

I am testing them one at a time, using the same cable. So it is not a case
of a bad cable.  The plug inserts to the same depth in both the headphone
and line out jacks, so I believe the plug is properly inserted,

I have been through both the Main Menu and Config menus, item by item.  I
see nothing that would give the option to turn off the left channel of the
line out.


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Re: [Elecraft] K3s Line Out (stereo)

[K9MA]

The headphone outputs from my radios are switched with some relays. The 
switching system has a common ground, which creates a ground loop, 
resulting in 60 Hz hum in the headphones. (Call it common impedance 
coupling, if you prefer.) I should have isolated the headphone grounds, 
but a path of less resistance was to insert the isolation transformers. 
They are just common 600 Ohm transformers, like the ones in the K3 line 
outputs, but they're a bit lossy driving headphones.


73,
Scott K9MA

On 1/16/2019 09:02, Bob McGraw K4TAX wrote:
I see no need for isolation transformers with headphones.  Likely the 
transformers is the reason the HP output won't drive a pair of 
headphones.   Isolation transformers?  Are they 3 winding hybrid 
transformers?    I've used them in professional audio installations 
but they are rare and expensive.


73

Bob, K4TAX




On 1/15/2019 11:23 PM, K9MA wrote:
I found that the level at headphone output, at least the rear panel 
one, was too low to drive two pairs of headphones in parallel in my 
setup, which includes some isolation transformers. The speaker 
output works fine with the headphones. (Don't try this with super 
sensitive low impedance headphones.) I just wired a switch to an 
external speaker.


73,
Scott K9MA

On 1/15/2019 20:51, Nr4c wrote:
Why use Line Out for speakers. There is a perfectly good jack 
marked Speakers right next to the Phones jack. Be sure and use a 
Stereo plug but it is for wait for it.  Speakers!





--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] K3s Line Out (stereo)

[Bob McGraw K4TAX]

I see no need for isolation transformers with headphones.  Likely the 
transformers is the reason the HP output won't drive a pair of 
headphones.   Isolation transformers?  Are they 3 winding hybrid 
transformers?    I've used them in professional audio installations but 
they are rare and expensive.


73

Bob, K4TAX




On 1/15/2019 11:23 PM, K9MA wrote:
I found that the level at headphone output, at least the rear panel 
one, was too low to drive two pairs of headphones in parallel in my 
setup, which includes some isolation transformers. The speaker output 
works fine with the headphones. (Don't try this with super sensitive 
low impedance headphones.) I just wired a switch to an external speaker.


73,
Scott K9MA

On 1/15/2019 20:51, Nr4c wrote:
Why use Line Out for speakers. There is a perfectly good jack marked 
Speakers right next to the Phones jack. Be sure and use a Stereo 
plug but it is for wait for it.  Speakers!




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[Elecraft] PWR12V1A-US voltage

[Jorge Diez - CX6VM]

hello

what about this power supply for K3/0 Mini?  is international voltage
110-240?

thanks!!

-- 
73,
Jorge
CX6VM/CW5W


Libre
de virus. www.avast.com

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
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[Elecraft] KX3 Dual Watch

[Hans J Rasmusen via Elecraft]

Good morning,

The KX3 has a nice Dual Watch feature. It is however, of limited use when the 
DX is weak and the callers are strong (a common case here).
To overcome this problem I have build a simple two channels audio amplifier 
with 2 LM380N (Manhattan style) with independent volumn controls. 
I can Independently boost the VFO A signal in one channel and reduce the VFO B 
in the other Channel. 
But some VFO A signal seems to leak into the VFO B channel and visa versa.
I can not observe any signal leakage when using an audio generator as test 
input. 

Has anyone observed something similar?
Does the KX3 Dual Watch feature only offer a limited channel separation or have 
I wired my amplifier wrongly?

Thank you in advance. 
73
OZ7BQ Hans Jørgen 



Sendt fra min iPhone
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Re: [Elecraft] PX3: Use outside in bright sunlight

[Paul Gacek via Elecraft]

Part way down my blog post you can see a picture of my PX3 outside in Lassen NP 
during the ARRL 2016 NPOTA event.

Amazingly visible!!

https://nomadic.blog/2016/05/09/a-noble-journey/ 


Paul W6PNG/M0SNA

> On Jan 15, 2019, at 8:35 PM, Edward R Cole  wrote:
> 
> I've wondered how well the PX3 screen displays in bright sunlight.  I Use my 
> KX3-2M as IF for my portable 10-GHz station and display of spectrum would be 
> handy for finding mw signals.  But this is activity on a high hill or 
> mountain or lake/oceanside location (not in a darkened vehicle or your home).
> 
> Typical LCD laptops screens are unusable in bright light so wonder about the 
> PX3.  Not interested in the P3 for my K3, just the PX3.
> 
> 73, Ed - KL7UW
>  http://www.kl7uw.com
> Dubus-NA Business mail:
>  dubus...@gmail.com 
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Re: [Elecraft] K3s Line Out (stereo)

[K9MA]

My station has a relay system for switching the headphones between two 
different radios, among other things. I had to add isolation 
transformers for the same reason the K3 has them on the line outputs. 
The loss in the transformers reduces the audio level too much for the 
rear panel headphone jack to drive two sets of the low sensitivity 
headphones I use. And I don't want a cable in the way to the front panel.


That's why it's "complicated".

73,
Scott K9MA

"Everything should be as simple as possible, but no simpler." -- Albert 
Einstein




On 1/15/2019 23:38, Don Wilhelm wrote:
Last Field Day, my K3 was used at the CW station.  Two sets of 
headphones.  One for the operator and one for the logger.
One was plugged into the rear panel Phones jack and the other was 
plugged into the front panel jack.  No problem, no splitter.
Ok, if there were folks nearby who wanted to listen in, we would 
simply turn on SPKR+PHONES in the menu, and the speaker could also be 
heard.


Very versatile.  Why make it complicated - the K3 gives us the tools 
to do it 'the easy way'.


73,
Don W3FPR

On 1/15/2019 11:23 PM, K9MA wrote:
I found that the level at headphone output, at least the rear panel 
one, was too low to drive two pairs of headphones in parallel in my 
setup, which includes some isolation transformers. The speaker output 
works fine with the headphones. (Don't try this with super sensitive 
low impedance headphones.) I just wired a switch to an external speaker.


73,
Scott K9MA

On 1/15/2019 20:51, Nr4c wrote:
Why use Line Out for speakers. There is a perfectly good jack marked 
Speakers right next to the Phones jack. Be sure and use a Stereo 
plug but it is for wait for it.  Speakers!




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--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] K3s Line Out (stereo)

[Nr4c]

Thanks Don. 

WAARC has been doing just that for about 8 or nine years. Works great. But some 
folks just want to make it hard. 

Sent from my iPhone
...nr4c. bill


> On Jan 16, 2019, at 12:38 AM, Don Wilhelm  wrote:
> 
> Last Field Day, my K3 was used at the CW station.  Two sets of headphones.  
> One for the operator and one for the logger.
> One was plugged into the rear panel Phones jack and the other was plugged 
> into the front panel jack.  No problem, no splitter.
> Ok, if there were folks nearby who wanted to listen in, we would simply turn 
> on SPKR+PHONES in the menu, and the speaker could also be heard.
> 
> Very versatile.  Why make it complicated - the K3 gives us the tools to do it 
> 'the easy way'.
> 
> 73,
> Don W3FPR
> 
>> On 1/15/2019 11:23 PM, K9MA wrote:
>> I found that the level at headphone output, at least the rear panel one, was 
>> too low to drive two pairs of headphones in parallel in my setup, which 
>> includes some isolation transformers. The speaker output works fine with the 
>> headphones. (Don't try this with super sensitive low impedance headphones.) 
>> I just wired a switch to an external speaker.
>> 73,
>> Scott K9MA
>>> On 1/15/2019 20:51, Nr4c wrote:
>>> Why use Line Out for speakers. There is a perfectly good jack marked 
>>> Speakers right next to the Phones jack. Be sure and use a Stereo plug but 
>>> it is for wait for it.  Speakers!
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[Elecraft] Setting band edges on the K3

[ANDY NEHAN via Elecraft]

I have searched the manual etc. and cant find a way of setting the band edges. 
By which I mean the frequencies outside of which the transmitter will not 
function. Here in Europe (as elsewhere I believe) different countries have 
different band edges - this is particularly so for the 5MHz band. It would be 
all too easy for me to respond to an FT8 CQ (for example) from a European 
station and find that I was transmitting outside of the UK 5MHz band. OK so I 
can fix my transmit frequency but it would be nicer if I could set band limits.
Have I missed something - is this facility hidden somewhere??
Andy G4HUE, K3, KPA500, KAT500, P3 owner.
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Re: [Elecraft] Non-Resonant Antennas and Chokes

[Victor Rosenthal 4X6GP]

I have three suggestions:

1) If you are feeding the antenna at the precise end of the wire, move 
the feedpoint out a few feet. That's because you need "the other half of 
the antenna." Because of the high impedance at this point, only a few 
feet are needed.


2) Don't connect one side of the ladder line to a ground rod. It doesn't 
help and will probably hurt. If you want to ground something, ground the 
shield of the coax at the tuner.


3) Use a good 1:1 balun designed for antenna tuner use between the tuner 
and the ladder line. Yes, people say you should use a 4:1 balun. Don't 
listen to them. The impedance at the end of the ladder line will be low 
on 40m (it's transformed by the near 1/4 wave ladder line). If you use 
the antenna on other bands it will vary all over the map.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 16/01/2019 4:15, John Pierce wrote:

I haven't read all the comments on this thread and thus may requesting
redundant info.  My antenna, for 40 mtr's, is a 67' wire up about 25'.  I
have 30' of 450 ohm ladder line connected to the end of the antenna and
bringing the antenna into my basement.  So I guess you could say that I have
a non-resonant end fed Zepp.

  


I can check the impedance at the end of the ladder line, where one side is
the antenna and the other side is connected to a ground rod at the point of
entering the house.   I can measure the impedance of the antenna in the
basement, using Mini60 without an antenna tuner .  The ladder line is then
connected to a MFJ 926B remote antenna tuner  The tuner is fed by about 30'
of RG58 coax from  my transmitter.  When I see a reactive component to the
impedance of the ladder line, without the tuner connected, should I have
some choke inserted in one side of the ladder line or not?  Should the tuner
be able to handle the reactive component?

  


John

AD2F

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