[Elecraft] Elecraft CW Net Announcement

[kevinr]

Good Evening,

   We are between spates of solar wind says SpaceWeather.com. That 
means our QRN will be from storms and atmospherics; maybe some hash from 
Jupiter too.  There is a VHF contest so the higher frequencies will get 
a blast of ions.  Hopefully that will help twenty and forty meters.


   Spring has been extended another week.  Forecasts of snow at the 
upper elevations means it won't be pleasant down here.  It did get up to 
60 just the other day.  And it was a sunny day. Hopefully summer will be 
warmer.  The ferns are still unrolling. About six more inches and they 
should be done.  They give good cover for the hummingbirds roosting 
among them.  I don't think there is anywhere for them to nest but the 
males enjoy flushing from them when I walk out the door.  It is best 
when one goes right behind my head while the other crosses in front of 
me.  I know they care :)


Please join us tomorrow on:

14050 kHz at 2200z Sunday (3 PM PDT Sunday)
  7045 kHz at z Monday (5 PM PDT Sunday)

73,
Kevin. KD5ONS

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Re: [Elecraft] Transmit Inhibit

[Clay Autery]

OK  I AM making progress.

What I have learned thusfar...  (Thanks for the patience of Don, WFPR 
and others.)


... and correct me if I am wrong, PLEASE.

1)  Pin #7 is TTL logic...  And logic pins need to NOT be left 
floating.  They need to see discrete logic high (+ 5vdc) or low (0 vdc) 
levels at all times. (Playing with the TX-INH settings on the K3s with 
nothing connected, I have seen what happens when the pin is left 
floating... the MCU doesn't know what it's going to get...  I've 
successfully gotten it to inhibit AND enable on both settings.)


2) The pull-up resistor basically acts sort of like a current limiter on 
the input pin and a load when the pin is pulled to ground.


3) Lower pull-up values improve switching speed.  Smaller is faster, but 
too small and you get too much current and power consumption/heating 
become issues.  Too high, switching too slow and voltage level may not 
be high enough to clearly be taken as a "high" logic state.


4) The "switch" needs to be between Pin #7 and +5VDC  and Pin #7

So now, it's just a matter of  putting  together a switching circuit 
that feeds Pin #7 with +5VDC when the SPE TX-INH signal is 12 vdc, and 
when the +12 vdc is removed, Pin #7 sees 0 vdc.  Seems simple, but...


Here is a link to a draft circuit I've drawn up based on a suggestion as 
to a particular MOSFET to use as a switching device:


http://www.montac.com/images/circuits/TX-INH_circuit.jpg

Notes/Questions:

Q1 = 2N7000G Small Signal MOSFET (N-channel)

R1 = Pull-up resistor, as per manual (2.2-10 kOhms)

?? R2 = Pull-down resistor, value unknown.  Needed?  I THINK it might be 
needed in view of the "requirement" for R3 below, and to potentially 
avoid using D1 below.


R3 = Rgs resistor, multiple references to the gate to source as a 
non-polarized capacitor and the need for a bleeder resistor to ground to 
aid in reliability of switch turn-off.  Value undetermined as yet.  My 
gut tells me R3 < R2, but I can't understand why I think that yet, exactly.


?? D1 = Protection for Pin #7 from 12 Vdc via bleeder resistor path.  
Yes, I realize I put it in the circuit the wrong way...   I 
really don't want to give up the forward voltage drop, but I can reduce 
the drop with a Schottkey, et al.  Reckon this extra protection is 
actually necessary enough to trade the 0.3+ volts or so?


+5 VDC  Don't know where I'm going to get this yet  Don't really 
want to steal the FSK pin...  maybe the amp has a line 5 volt line I can 
steal.


This device is getting bigger by the minute... the idea is to shrink it 
into the cable right behind the connector housing... IDEALLY, it would 
be better INSIDE the connector shell, but that's not going to happen.  
May have to demo the circuit and then recreate it in SMD.



73,

__
Clay Autery, KY5G
(318) 518-1389


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Re: [Elecraft] KAT500 Utility for MAC

[John Hiatt]

Are you sure you are looking at a current page?  On the main software page, it 
shows the most recent version # is 1.16.6.14.  This does appear to be wrong 
anyway, as the 2nd link below shows the current Windows version is 1.16.7.25:

http://www.elecraft.com/software/elecraft_software_page.htm


On the KAT500 page it shows the 1.14.2.1 version for the Mac, which I believe 
is what the original poster needs:

http://www.elecraft.com/KAT500/kat500_software.htm


The only reference I can find for 1.13.6.17 for the Mac is on an old archived 
page, but of course, the download link is dead:

http://www.elecraft.com/KAT500/kat500_software.htm.old

John, KC7DRI


From: elecraft-boun...@mailman.qth.net  on 
behalf of Neil Zampella 
Sent: Saturday, June 9, 2018 5:00 PM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT500 Utility for MAC

Um ... just a heads up to the Elecraft folks, the older 1.13.6.17
version is the only version that's shown on the Firmware & Software page
on the Elecraft website.

Neil, KN3ILZ


On 6/8/2018 8:23 PM, John Hiatt wrote:
> Does it have to be that old version?  The current version is at:
>
> http://www.elecraft.com/KAT500/KAT500UtilityOSX_1_14_2_1.zip
>
> John, KC7DRI
>
> 
> From: elecraft-boun...@mailman.qth.net  on 
> behalf of Chris Hallinan 
> Sent: Friday, June 8, 2018 3:41 PM
> To: 
> Subject: [Elecraft] KAT500 Utility for MAC
>
> Not Found
>
> The requested URL /KAT500/KAT500UtilityOSX_1_13_6_17.zip was not found on
> this server.
> Anyone know where I can find it?
>
> 73 de K1AY
> Chris
>
> --
> Life is like Linux - it never stands still.
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Re: [Elecraft] KPA1500 Linearity

[Wes Stewart]

Thank you for posting this.  I have been saying it for years on these forums and 
getting told that I didn't know what I was talking about.  Now maybe the 
naysayers will take note.


Wes  N7WS


On 6/9/2018 6:28 PM, Wayne Burdick wrote:

Finally, both the transceiver and amp will vary from band to band somewhat in 
IMD. You might for example see -40 dBc on one, but in the low 30’s on the 
other, on a given band. Again, this is typical of all such SS rigs/amps except 
those running class A or using closed-loop feedback (predistortion).



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Re: [Elecraft] KPA1500 Linearity

[K9MA]

Thanks, Wayne.  I'm glad to hear this isn't typical. 

I sent a report to tech support with all the details.  I'll call later next 
week, as I'll be out of town with the KX2 until Thursday.

73,
Scott K9MA 

--

Scott Ellington

 --- via iPad

> On Jun 9, 2018, at 8:28 PM, Wayne Burdick  wrote:
> 
> Scott,
> 
> I’m not sure how you’re doing the test, but this is definitely not 
> characteristic. 
> 
> We test every amp for IMD, and we see an average of about -35 dBc (3rd order, 
> ARRL method) across all bands. This is state of the art for an LDMOS deign 
> running class AB. Other SS amps using similar designs have have similar 
> performance.  
> 
> Any amp’s gain levels off as it approaches peak power (ie, is slightly in 
> compression). But it should not be flat-topping unless it’s over driven or is 
> starved for supply current/voltage. 
> 
> Finally, both the transceiver and amp will vary from band to band somewhat in 
> IMD. You might for example see -40 dBc on one, but in the low 30’s on the 
> other, on a given band. Again, this is typical of all such SS rigs/amps 
> except those running class A or using closed-loop feedback (predistortion). 
> 
> Please call Monday to discuss your test method with one of our technical 
> staff. 
> 
> 73,
> Wayne
> N6KR
> 
> 
> 
> http://www.elecraft.com
> 
>> On Jun 9, 2018, at 2:21 PM, K9MA  wrote:
>> 
>> I recently ran a two-tone test and measured CW power gain. (SN1078)  It 
>> doesn't look good.  The two-tone waveform shows distinct "flat-topping", and 
>> the power gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z 
>> amplifier is much better.  Has anyone measured IMD or linearity, or seen any 
>> test results?
>> 
>> While I'm primarily a CW operator, I'd be very reluctant to use the 
>> amplifier on SSB.
>> 
>> 73,
>> 
>> Scott K9MA
>> 
>> -- 
>> Scott  K9MA
>> 
>> k...@sdellington.us
>> 
>> __
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Re: [Elecraft] KPA1500 Linearity

[Michael Blake]

Scott, I don’t know if this helps much but several of the locals have 
constructed BLF-188 amps (singles and pairs) in the past two years.  The W7, 
Israeli and Russian boards were used and they all suffered the same fate in 
various degrees.  They would cease being very linear at about 75% of their CW 
output.  Careful selection of bias and feedback levels would allow some 
improvement but in none of the cases were the devices even close to acceptable 
IMD wise at their data sheet output levels.  The only one that am aware of that 
worked well was a W8 friend who is driving it (EB-104 water cooled Russian 
amplifier) with an Anan and used Pure Signal to effectively clean it up.  On 
all of the others when the output came up to the target level you could 
immediately start seeing them in the opposite sideband.

All of the data sheets that we saw at the time talked about CW/FM applications 
and none provided specs for SSB linear service.

These have been my observations of the BLF-188 amps.

Very 73 - Mike - K9JRI







> On Jun 9, 2018, at 9:08 PM, K9MA  wrote:
> 
> I did look at the K3 output, and it's much, much better than the KPA1500 
> output.  I also checked that the KPA1500 supply voltage was not dropping 
> much: 53 V in standby, 52 V at 1500 W.
> 
> 73,
> Scott K9MA 
> 
> --
> 
> Scott Ellington
> 
> --- via iPad
> 
>> On Jun 9, 2018, at 7:26 PM, Wes Stewart  wrote:
>> 
>> I don't have a KPA1500 or enough power attenuators to test my KPA500, but I 
>> have spent many dozens of hours looking at TX IMD on my two K3s.
>> 
>> I will simply say, if you haven't already, check the IMD of the bare K3 
>> before blaming the KPA1500. Garbage in, garbage out.  That of course doesn't 
>> pardon the KPA for dropping gain.
>> 
>> Wes  N7WS
>> 
>> 
>>> On 6/9/2018 2:21 PM, K9MA wrote:
>>> I recently ran a two-tone test and measured CW power gain. (SN1078) It 
>>> doesn't look good.  The two-tone waveform shows distinct "flat-topping", 
>>> and the power gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z 
>>> amplifier is much better.  Has anyone measured IMD or linearity, or seen 
>>> any test results?
>>> 
>>> While I'm primarily a CW operator, I'd be very reluctant to use the 
>>> amplifier on SSB.
>>> 
>>> 73,
>>> 
>>> Scott K9MA
>>> 
>> 
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Re: [Elecraft] KPA1500 Linearity

[Wayne Burdick]

Scott,

I’m not sure how you’re doing the test, but this is definitely not 
characteristic. 

We test every amp for IMD, and we see an average of about -35 dBc (3rd order, 
ARRL method) across all bands. This is state of the art for an LDMOS deign 
running class AB. Other SS amps using similar designs have have similar 
performance.  

Any amp’s gain levels off as it approaches peak power (ie, is slightly in 
compression). But it should not be flat-topping unless it’s over driven or is 
starved for supply current/voltage. 

Finally, both the transceiver and amp will vary from band to band somewhat in 
IMD. You might for example see -40 dBc on one, but in the low 30’s on the 
other, on a given band. Again, this is typical of all such SS rigs/amps except 
those running class A or using closed-loop feedback (predistortion). 

Please call Monday to discuss your test method with one of our technical staff. 

73,
Wayne
N6KR



http://www.elecraft.com

> On Jun 9, 2018, at 2:21 PM, K9MA  wrote:
> 
> I recently ran a two-tone test and measured CW power gain. (SN1078)  It 
> doesn't look good.  The two-tone waveform shows distinct "flat-topping", and 
> the power gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z 
> amplifier is much better.  Has anyone measured IMD or linearity, or seen any 
> test results?
> 
> While I'm primarily a CW operator, I'd be very reluctant to use the amplifier 
> on SSB.
> 
> 73,
> 
> Scott K9MA
> 
> -- 
> Scott  K9MA
> 
> k...@sdellington.us
> 
> __
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Re: [Elecraft] KPA1500 MARS Operation?

[George Johnson W1ZT]

Thanks Wayne, I think that is what I needed to know.  Will wait for the work to 
be completed.
This new amp is working great and will support my MARS activity too with the 
built-in tuner.
73, George  W1ZT  

-Original Message-
From: Wayne Burdick [mailto:n...@elecraft.com] 
Sent: Saturday, June 09, 2018 11:20 AM
To: George Johnson W1ZT
Cc: Elecraft Reflector
Subject: Re: [Elecraft] KPA1500 MARS Operation?

We’re almost finished with MARS characterization, George. When the new firmware 
is released, the amp will be usable from 2-30 MHz with very few excluded 
segments. 

We’ll post full details next week. 

73,
Wayne 
N6KR


http://www.elecraft.com

> On Jun 9, 2018, at 4:49 AM, George Johnson W1ZT  wrote:
> 
> Looking for status of any MARS update for the KPA1500 for MARS operation.
> 
> My new amp is fine but just needs that ham band restriction modified as was
> done for the K3.
> 
> Have contacted Support but no info other than referral to FAQ which simply
> says MARS is supported.
> 
> Thanks for any suggestions,
> 
> George  W1ZT

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Re: [Elecraft] KPA1500 Linearity

[K9MA]

I did look at the K3 output, and it's much, much better than the KPA1500 
output.  I also checked that the KPA1500 supply voltage was not dropping much: 
53 V in standby, 52 V at 1500 W.

73,
Scott K9MA 

--

Scott Ellington

 --- via iPad

> On Jun 9, 2018, at 7:26 PM, Wes Stewart  wrote:
> 
> I don't have a KPA1500 or enough power attenuators to test my KPA500, but I 
> have spent many dozens of hours looking at TX IMD on my two K3s.
> 
> I will simply say, if you haven't already, check the IMD of the bare K3 
> before blaming the KPA1500. Garbage in, garbage out.  That of course doesn't 
> pardon the KPA for dropping gain.
> 
> Wes  N7WS
> 
> 
>> On 6/9/2018 2:21 PM, K9MA wrote:
>> I recently ran a two-tone test and measured CW power gain. (SN1078) It 
>> doesn't look good.  The two-tone waveform shows distinct "flat-topping", and 
>> the power gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z 
>> amplifier is much better.  Has anyone measured IMD or linearity, or seen any 
>> test results?
>> 
>> While I'm primarily a CW operator, I'd be very reluctant to use the 
>> amplifier on SSB.
>> 
>> 73,
>> 
>> Scott K9MA
>> 
> 
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Re: [Elecraft] Field Day rig experience

[Paul Antos]

Take the K3 , leave the IC-7610 at home. It’s to darn heavy to lug around. (19 
lbs )

NS2N

Sent from Mail for Windows 10

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Re: [Elecraft] P3: Left span limit changes

[Nolan Kienitz]

Skip,

I can replicate your scenario and my K3 does the same thing. When I first
read it I was thinking a CW offset shift, but I'm sure that was a
pipe-dream.

You noted your left edge is at:  14020.000 ... mine (with a span of 20) is
at: 14018.000.  That is the only difference, but again I experienced the
same thing.

Was hoping to help provide a clue, but am not able to do so.  Sorry.

73 - Nolan Kienitz
KI5IO
Plano, TX



-
73  -  Nolan Kienitz,  KI5IO
--
Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] KPA1500 Linearity

[Wes Stewart]

I don't have a KPA1500 or enough power attenuators to test my KPA500, but I have 
spent many dozens of hours looking at TX IMD on my two K3s.


I will simply say, if you haven't already, check the IMD of the bare K3 before 
blaming the KPA1500. Garbage in, garbage out.  That of course doesn't pardon the 
KPA for dropping gain.


Wes  N7WS


On 6/9/2018 2:21 PM, K9MA wrote:
I recently ran a two-tone test and measured CW power gain. (SN1078) It doesn't 
look good.  The two-tone waveform shows distinct "flat-topping", and the power 
gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z amplifier is 
much better.  Has anyone measured IMD or linearity, or seen any test results?


While I'm primarily a CW operator, I'd be very reluctant to use the amplifier 
on SSB.


73,

Scott K9MA



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Re: [Elecraft] KAT500 Utility for MAC

[Neil Zampella]

Um ... just a heads up to the Elecraft folks, the older 1.13.6.17 
version is the only version that's shown on the Firmware & Software page 
on the Elecraft website.


Neil, KN3ILZ


On 6/8/2018 8:23 PM, John Hiatt wrote:

Does it have to be that old version?  The current version is at:

http://www.elecraft.com/KAT500/KAT500UtilityOSX_1_14_2_1.zip

John, KC7DRI


From: elecraft-boun...@mailman.qth.net  on behalf 
of Chris Hallinan 
Sent: Friday, June 8, 2018 3:41 PM
To: 
Subject: [Elecraft] KAT500 Utility for MAC

Not Found

The requested URL /KAT500/KAT500UtilityOSX_1_13_6_17.zip was not found on
this server.
Anyone know where I can find it?

73 de K1AY
Chris

--
Life is like Linux - it never stands still.
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[Elecraft] P3: Left span limit changes

[Fred Jensen]

1. Serial path is PC-->P3-->K3

2. VFO-A is on 14028.000 CW

3. VFO-B is on 14300.000 SSB

4. P3 is in fixed-tune mode [cursor moves, screen edges remain at fixed 
frequencies as I tune], SPAN=20 KHz, left edge is 14020.000


5. Tap A/B

6. K3 goes to 14300.000 SSB, left edge of P3 is 14300.000, span is still 
20 KHz. So far, so good


7. Tap A/B again

8. Radio goes back to 14028.000 CW, span is still 20 KHz, but left edge 
is now 14025.000 [instead of 14020.000 that it was].


Why does the P3 span shift up 5 KHz after switching VFO's?

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

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[Elecraft] Field Day plans 2018

[Doug Eaton via Elecraft]

This year my son (N7HHH) and I will be running the KX3 as a 1B battery station 
from the backwoods of WWA. Last year used the same setup at Mt. Rainier 
National Park, but we were on the wrong side of the mountain, and most of the 
US was blocked! Won't make that mistake again. Two days ago I installed the 
roofing filter option, and so far it seems to reduce interference on a busy 
band. Have fun on FD everyone.  Doug N7QS
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Re: [Elecraft] Field Day rig experience

[Jim Shepherd]

Last year I was running my K3s digital, and I could see the CW operators
and the voice operators on the P3, but never heard them. At one point one
of the CW ops was only 10 KHz away and not interfering with PSK31.

Will be repeating the operation this year, with a 7A station, there will be
lots of other signals from the other radios that are a mix of Y-I-K... I'm
bringing some external bandpass filters for those other stations to use to
protect them from each other.

Look for W7TA at Washoe Lake State Park between Reno and Carson City!

73, Jim W6US
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Re: [Elecraft] Field Day rig experience

[Edward R Cole]

We have used the parking lot of Sky View HS, Soldotna, AK for several 
years.  HS was shutdown about five years ago and located in hills 
south of the *small* city of 7500.  Club has TS450's and run two 
stations 80-10m, 100w under KL7AN.


I usually join them to help setup at 9am with 10am start time.  This 
year I will have my KX3 and KXPA100 installed in my truck, as we head 
out on the road with out 5th wheel trailer after FD weekend heading 
for Ohio (5000miles).  Only have 80m and 20m hamsticks for HF and use 
a half-wave base-loaded 2m whip for 6m.  I might turn on the KX3 to 
checkout close operation at the FD site.


Details of the mobile setup: http://www.kl7uw.com/Mobile.htm

73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] Soundcard

[Joe Subich, W4TV]

What operating system? Windows 10?

If so, Microsoft have made a significant (undocumented) change in sound
card handling with the Spring (April) Update of Windows 10.

You will now need to select PC Settings -> *PRIVACY* -> Microphone and
*TURN ON* "Allow apps to access your microphone".

"Allow apps to access your microphone" now means "Allow apps to use
sound devices for input". If "Allow apps to access your microphone" is
turned off, Windows will not pass audio to *any* application.

73,

   ... Joe, W4TV


On 2018-06-09 5:09 PM, Peter B wrote:

Hello list,
I have the kios3 upgrade for my K3.
Iam trying to get mmtty running with the soundcard in the K3 but i have no
singal on mmtty. Looks like that mmtty is mot seeing my soundcard.
Any help and suggestions are welcome.

73s,
Peter/pd1rp
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Re: [Elecraft] Transmit Inhibit

[Clay Autery]

OK... let me try this again and see if I can do a better job explaining 
the task at hand and my questions. (Thanks to the 2 folks who replied!!)


Task:  Build a cable that connects my K3s to an SPE 1K-FA amp (on loan 
until I can buy a KPA-1500) using the TX-INH signal from the SPE amp to 
INHIBIT the K3s from transmitting ALL the time UNLESS it is the selected 
exciter AND it sends the SPE amp a "key/relay" signal.


Purpose:  To use the SPE as the arbiter of which INPUT/EXCITER has the 
drive privileges, to future proof the cable wiring for probable 
AMPLIFIER sharing between TWO exciters at some point. If BOTH exciters 
are put into inhibit BY DEFAULT by the SPE, an exciter may ONLY drive 
the amp IF, 1) the exciter is connected to the ACTIVE SPE exciter input, 
AND 2) the exciter sends a key/relay signal to the SPE amp.  There's a 
lot of other logic involved, but this is the key point  BOTH 
exciters are Inhibited by default (TX light blinking on K3s), and ONLY 
one may EVER drive the amp at one time.  No external devices required.


Components/Connections:

K3s, using ACC port, Pin #7 (with TX-INH set to "High") (and of course 
Pin # 5, GND)  (There are other pins being used, but I am pairing it 
down to JUST this topic)


SPE 1K-FA Amp Input #1 CAT port, Pin #13 (TX-INH) and Pin #4 GND.

The SPE Amp outputs +12VDC on the TX-INH signal line to the exciter 
UNTIL the amp sends a key/relay signal to the amp, at which point the 
SPE amp drops the TX-INH signal to 0 vdc.


Background:  The fellow I got the cable pinout, et al. from actually had 
the SPE TX-INH connected to the K3s Pin #7 (TX-Inh set "High) for over a 
year with no ill effects.  When he was informed that the SPE was using 
12VDC, but the K3s was expecting 5VDC, he put a simple voltage divider 
on the signal line and to ground to reduce the SPE's TX-INH voltage to 
+5vdc, and it still works.  I am simply going through this inquiry to 
MAKE SURE that I am providing the K3s the specified voltages for the two 
states (TX Inhibited and TX Enabled).


Questions:

1) What does the K3s expect to "see" at Pin #7 with TX-INH set to "High" 
(and low for that matter)  Is it, as I suspect, TX-INH set to "high" TX 
inhibited = +5 VDC and TX Enabled = 0 VDC.   OR.  TX-INH set to 
"Low"; TX Inhibited = 0 VDC and TX Enabled = +5 VDC, or is it more 
complicated where the K3s wants to see +5VDC on BOTH sides of the TX-INH 
setting, where with TX-INH set Low, it's the same"  Inhibited = 0VDC and 
TX enabled is +5 VDC, BUT TX-INH set to "High" it wants to see TX 
Inhibited = (x volts above +5VDC) and TX Enabled = +5VDC.  I would think 
it is the former but the fact that it worked at 12 VDC for a year 
without torching/letting the smoke out of anything gives me pause.


2) IF the K3s simply expects +5VDC for Inhibit and 0 VDC for Enabled on 
Pin #7, and the SPE amp supplies the +12 VDC on the signal line for 
INHIBIT and then grounds that output for Enabled, why can't a simple 2 
resistor voltage divider (or pot) can't be used to drop the SPE output 
from +12 to +5 VDC, or indeed why you couldn't simply use a single 
inline resistor of the correct value to do it?


I should probably just replicate what has been proven to work and not 
worry about it, but I truly want to understand why/how this is supposed 
to work, so I know I am providing the signal levels intended.


Going schematic diving

73

__
Clay Autery, KY5G
(318) 518-1389

On 08-Jun-18 22:12, Clay Autery wrote:
I'm going to use ACC Pin #7 as Transmit Inhibit (High), and the manual 
says this:


"TX INH (Transmit Inhibit Signal)
Pin 7 of the ACC connector can be configured as a
transmit inhibit input by setting CONFIG:TX INH
to LO=Inh (or HI=Inh). Holding pin 7 low (or
high) will then prevent transmit. An external 2.2 to
10 K pull-up resistor (to 5 VDC) is required.
If TX INH is set to OFF, pin 7 reverts to its
default output function, K3S ON (see above)."

This has confused me a bit...  I'm not an electronic expert. The input 
signal is 12 vdc, present all the time EXCEPT when the K3s keys up... 
the amp gets that message and drops the signal to ) vdc...  Not sure 
how to pull off reducing the input from 12 to 5vdc with a single 
external resistor.
I DO know how to do it with a voltage divider  Vout = Vin x 
R2/(R1+R2)  Calculate resistor values, tie them together at one end 
and that end connects to Pin #7 at K3s end.  R1's other end ties to 
the (+) signal in from amp, and R2's other end ties to the ground 
(conductor on Pin #5).


Is there a simpler way to do this with a single resistor?  Am I 
missing something?


And am I in fact reading the manual correctly?  The K3 expects a TTL 
logic level + 5 vdc on Pin #7 to activate inhibit with TX Inh set to 
"high"?  A straight 12vdc exceeds the spec for that pin as an input?  
(When it's used as the K3s ON output to XVERTER, it OUTPUTS +5 VDC)


I'm trying to get this custom cable built for this amp this 
w

Re: [Elecraft] Soundcard

[Don Wilhelm]

Peter,

Did you tell MMTTY which soundcard to use?  There should be a selection 
in the software, it is not automatic.


73,
Don W3FPR

On 6/9/2018 5:09 PM, Peter B wrote:

Hello list,
I have the kios3 upgrade for my K3.
Iam trying to get mmtty running with the soundcard in the K3 but i have no
singal on mmtty. Looks like that mmtty is mot seeing my soundcard.
Any help and suggestions are welcome.

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Re: [Elecraft] Which MCU Version is the latest?

[Mark E. Musick]

Hi Bob,
Here is the link to the latest firmware. Beta version 5.64.

ftp://ftp.elecraft.com/K3/firmware/beta

It has been out a while. You need this version if you are using the KPA1500
and want the KPA1500 to put the K3/K3S in tune when using the internal ATU.

73,
Mark, WB9CIF

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Bob DeHaney
Sent: Saturday, June 9, 2018 9:03 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Which MCU Version is the latest?

The webpage says MCU version 5.62 is the latest.  However, the K3 utility
tells me only MCU version 5.60 is available. What to do?

Vy 73 de Bob DJ0RD/WU5T

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[Elecraft] KPA1500 Linearity

[K9MA]

I recently ran a two-tone test and measured CW power gain. (SN1078)  It 
doesn't look good.  The two-tone waveform shows distinct "flat-topping", 
and the power gain drops 25 percent from 1000 to 1500 Watts.  My old 
3-500Z amplifier is much better.  Has anyone measured IMD or linearity, 
or seen any test results?


While I'm primarily a CW operator, I'd be very reluctant to use the 
amplifier on SSB.


73,

Scott K9MA

--
Scott  K9MA

k...@sdellington.us

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[Elecraft] Soundcard

[Peter B]

Hello list,
I have the kios3 upgrade for my K3.
Iam trying to get mmtty running with the soundcard in the K3 but i have no
singal on mmtty. Looks like that mmtty is mot seeing my soundcard.
Any help and suggestions are welcome.

73s,
Peter/pd1rp
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Re: [Elecraft] Which MCU Version is the latest?

[John Hiatt]

If the K3 utility works like my KX3 utility does, the utility does not 
automatically check for new updates.  There should be a button to 'Copy New 
Files from Elecraft' on the Firmware tab.

John, KC7DRI


From: elecraft-boun...@mailman.qth.net  on 
behalf of Bob DeHaney 
Sent: Saturday, June 9, 2018 2:02 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Which MCU Version is the latest?

The webpage says MCU version 5.62 is the latest.  However, the K3 utility
tells me only MCU version 5.60 is available. What to do?

Vy 73 de Bob DJ0RD/WU5T

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Re: [Elecraft] Which MCU Version is the latest?

[K9MA]

Just click on "Copy New Files from Elecraft"

73,
Scott K9MA

On 6/9/2018 16:02, Bob DeHaney wrote:

The webpage says MCU version 5.62 is the latest.  However, the K3 utility
tells me only MCU version 5.60 is available. What to do?

Vy 73 de Bob DJ0RD/WU5T

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--
Scott  K9MA

k...@sdellington.us

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[Elecraft] Which MCU Version is the latest?

[Bob DeHaney]

The webpage says MCU version 5.62 is the latest.  However, the K3 utility
tells me only MCU version 5.60 is available. What to do?

Vy 73 de Bob DJ0RD/WU5T

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Re: [Elecraft] 2018 Field Day

[Ian Kahn]

I'll be at at the North Fulton (GA) Amateur Radio League's (K4JJ) 3A Field
Day operation, with my K3 (s/n 281) running as the phone station.

73 de,  Ian, KM4IK

On Sat, Jun 9, 2018, 12:51 PM aj4tf  wrote:

> What are your Elecraft plans for Field Day?   I'll be on the air at W4UA
> (High Point, NC) with K3S # 10669 and K2 # 7006.  The other two stations
> will be some other "Y" gear...
>
> 73 de AJ4TF
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
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[Elecraft] (no subject)

[Edward R Cole]

For ideas on how to use TX INHIBIT:
http://www.kl7uw.com/TX-INHIBIT.htm

I do exactly as Don suggests; connect KEYOUT to sequencer input and 
last stage of sequencer is "K4" shown in the Inhibit diagram on my webpage.


For ideas on building your computer/radio I/F:
http://www.kl7uw.com/Digital_I-F.htm

73, ED - KL7UW


From: Don Wilhelm 
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Default K3 transmit delay may be too short for
slow QRO amplifiers
Message-ID: <53ea136e-5067-df0d-3462-01940840b...@embarqmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

With the Elecraft gear (starting with the K3), a sequencer can be
started with the KEYOUT output and RF held off by TX INHibit until the
sequencer completes.
Of course, there are other methods, but to my mind, that is the most
"automatic" method - you operate the transceiver as normal and it "just
happens".

73,
Don W3FPR


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] Field Day rig experience

[K9MA]

On 6/9/2018 14:52, David Gilbert wrote:
I think another major concern for closely positioned rigs would be 
transmitted phase noise, and of course that doesn't show up in the 
Sherwood  charts. 


Yes, it does!

73,

Scott K9MA

--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] Field Day rig experience

[David Gilbert]

I think another major concern for closely positioned rigs would be 
transmitted phase noise, and of course that doesn't show up in the 
Sherwood  charts.  Jim's tests 
(http://audiosystemsgroup.com/TXNoise.pdf) show some large differences 
between various rigs, although the 7300 and 7610 are not specifically 
included (the 7600 is, however).  The K3/S are much cleaner rigs.


73,
Dave   AB7E



On 6/9/2018 9:34 AM, Wayne Burdick wrote:

On Jun 9, 2018, at 5:24 AM, Bill  wrote:

Along the line (lightly discussed under "K3- AF Knob") of what rigs are used for 
dxpeditions and Field Day..  How do the new technology ICOMs (7300 and 7610) do under the 
"several rigs on the same band" conditions? The size, weight, and cost factor is inviting 
for the 7300 - BUT!!! Is it up to the job? Close to up to the job? Or, better left home during 
these events?


Hi Bill,

Hopefully you’ll get some responses to this question from those with direct 
experience. But looking at it theoretically: both the 7300 and 7610 are 
direct-sampling radios with about 25-30 dB less blocking dynamic range than the 
K3 or K3S. On Field Day this could have a definite impact when using multiple 
transmitters on the same band, or even on different bands, depending on antenna 
spacing and power level used.

Dynamic range of all of these radios is quantified in the receiver performance 
table at www.sherweng.com, specifically the fifth column (“100 kHz Blocking”).

Wayne



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Re: [Elecraft] Default K3 transmit delay may be too short for slow QRO amplifiers

[Dimitry Borzenko]

Hi Bob.
Transceiver can not supply multi sequenced events, but can prevent to 
burn LNA if have long TX DLY time and input of sequencer connected to 
PTT of K3.
You can say,  who connect sequencer to the transceiver, sequencer must 
engage TRX and not contrariwise.

Two ways is right, but every way have weakness.
In first way when sequencer gives PTT command to TRX - pushing on 
"Send", "XMIT" or PTT on  microphone or keyer will destroy LNA etc. if 
do not use TX Inhibit.
In second way when we have enough delay between PTT signal and RF output 
- we need to set delay time little bit more then all commutations needs, 
for example I know my mast LNA needs 30ms, PA 40ms plus additional 10ms, 
so for safety use 80mS is enough(if U use delay time between LNA off and 
PA ON).
I have use sequencer in the PA( sequence ~60mS) and generate -9V for 
TS-2000, for K3S I need different voltage for TX Inhibit, all this 
signals needs only because I do not have option to set TX DLY more than 
20mS!


Regards.


-- Original Message --
From: "Bob McGraw K4TAX" 
To: elecraft@mailman.qth.net
Sent: 09.06.2018 2:46:26
Subject: Re: [Elecraft] Default K3 transmit delay may be too short for 
slow QRO amplifiers


From experience, in an operation as you describe, a sequencer is almost 
mandatory to assure each item switches as it should and that proper 
feedback on that item to the sequencer to allow it to proceed to the 
next interval and switching.  I don't feel one can relay just on the 
radio to perform this function.  My sequenced EME station put the 
transceiver in the transmit mode as the last item in the timing of 
events.I don't understand how one can expect a transceiver to 
supply multi sequenced events.


I've fried enough mast mounted preamps, coax relays and caused amp 
flash overs enough times before a proper timed sequencer was employed.  
 Legal limit power on 70 cm can really do nasty things.


73

Bob, K4TAX


On 6/8/2018 12:56 PM, Dimitry Borzenko wrote:

Hi group.
Please understand, this nice transceiver is used not only for HF. but 
also for VHF,UHF and uppp.

So, more TX DLY is needed!
LNAs, polarization switches, PA and transverters in the transmission 
line.

Sequencer is nice device but if U press XMIT button - BIG BAGA BUM :(
I hope Elecraft engineers will add additional  TX DLY.

Tnx a lot.




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Re: [Elecraft] 2018 Field Day

[rich hurd WC3T]

yeah; forgot to mention this is all with my KX3.  :)

On Sat, Jun 9, 2018 at 14:48 Tox  wrote:

> If I'm not still wrapping up projects in the garage, I hope to be learning
> how to drive the kx3 I bought for Field Day last year :)
>
> Ad6yt
>
> On Sat, Jun 9, 2018, 11:32 AM rich hurd WC3T  wrote:
>
>> That's our family camping weekend.   :)  I will be 1B as long as the
>> battery lasts, then 1A.  Will try SSB QRP but will probably fall back to
>> some other mode depending on results.   My first FD so my expectations are
>> low.  :)
>>
>> On Sat, Jun 9, 2018 at 14:20 Michael Blake  wrote:
>>
>> > Charlie, I am really racking them up thus far.  One CW and one FT8 on 6M
>> > with my K3s.
>> >
>> > Michael Blake
>> > k9...@mac.com 
>> >
>> >
>> >
>> >
>> >
>> >
>> > > On Jun 9, 2018, at 2:17 PM, Charlie T  wrote:
>> > >
>> > > I'll be sitting out under a big pine tree in our yard with a couple
>> > portable
>> > > antennas, a radio and a big car battery.
>> > >
>> > > Or, was that a rhetorical question?
>> > >
>> > > 73, Charlie k3ICH
>> > >
>> > >
>> > > -Original Message-
>> > > From: elecraft-boun...@mailman.qth.net <
>> elecraft-boun...@mailman.qth.net>
>> > On
>> > > Behalf Of aj4tf
>> > > Sent: Saturday, June 09, 2018 12:49 PM
>> > > To: elecraft@mailman.qth.net
>> > > Subject: [Elecraft] 2018 Field Day
>> > >
>> > > What are your Elecraft plans for Field Day?   I'll be on the air at
>> W4UA
>> > > (High Point, NC) with K3S # 10669 and K2 # 7006.  The other two
>> stations
>> > > will be some other "Y" gear...
>> > >
>> > > 73 de AJ4TF
>> > >
>> > >
>> > >
>> > >
>> > > __
>> > > 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 k9...@mac.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 r...@wc3t.us
>> >
>> --
>> 72,
>> Rich Hurd / WC3T / DMR: 3142737
>> PA Army MARS, Northampton County RACES, EPA-ARRL Public Information
>> Officer
>> for Scouting
>> Latitude: 40.761621 Longitude: -75.288988  (40°45.68' N 75°17.33' W) Grid:
>>
> *FN20is*
>
>
>> __
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> Message delivered to scott.sm...@gmail.com
>
> --
72,
Rich Hurd / WC3T / DMR: 3142737
PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer
for Scouting
Latitude: 40.761621 Longitude: -75.288988  (40°45.68' N 75°17.33' W) Grid:
*FN20is*
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[Elecraft] Field Day

[John Hendricks]

I will be operating a KX3 GOTA & 2/6 Meters all mode, along with a K3 CW,
K3 SSB and a heavly band pass filered ICOM Digital station located a long
distance away. Wish they would use an Elecraft rig. Look for W7SAA, or
K7JLT GOTA.

John K7JLT
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Re: [Elecraft] 2018 Field Day

[Tox]

If I'm not still wrapping up projects in the garage, I hope to be learning
how to drive the kx3 I bought for Field Day last year :)

Ad6yt

On Sat, Jun 9, 2018, 11:32 AM rich hurd WC3T  wrote:

> That's our family camping weekend.   :)  I will be 1B as long as the
> battery lasts, then 1A.  Will try SSB QRP but will probably fall back to
> some other mode depending on results.   My first FD so my expectations are
> low.  :)
>
> On Sat, Jun 9, 2018 at 14:20 Michael Blake  wrote:
>
> > Charlie, I am really racking them up thus far.  One CW and one FT8 on 6M
> > with my K3s.
> >
> > Michael Blake
> > k9...@mac.com 
> >
> >
> >
> >
> >
> >
> > > On Jun 9, 2018, at 2:17 PM, Charlie T  wrote:
> > >
> > > I'll be sitting out under a big pine tree in our yard with a couple
> > portable
> > > antennas, a radio and a big car battery.
> > >
> > > Or, was that a rhetorical question?
> > >
> > > 73, Charlie k3ICH
> > >
> > >
> > > -Original Message-
> > > From: elecraft-boun...@mailman.qth.net <
> elecraft-boun...@mailman.qth.net>
> > On
> > > Behalf Of aj4tf
> > > Sent: Saturday, June 09, 2018 12:49 PM
> > > To: elecraft@mailman.qth.net
> > > Subject: [Elecraft] 2018 Field Day
> > >
> > > What are your Elecraft plans for Field Day?   I'll be on the air at
> W4UA
> > > (High Point, NC) with K3S # 10669 and K2 # 7006.  The other two
> stations
> > > will be some other "Y" gear...
> > >
> > > 73 de AJ4TF
> > >
> > >
> > >
> > >
> > > __
> > > 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 k9...@mac.com
> >
> > __
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to r...@wc3t.us
> >
> --
> 72,
> Rich Hurd / WC3T / DMR: 3142737
> PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer
> for Scouting
> Latitude: 40.761621 Longitude: -75.288988  (40°45.68' N 75°17.33' W) Grid:
> *FN20is*
> __
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Re: [Elecraft] 2018 Field Day

[rich hurd WC3T]

That's our family camping weekend.   :)  I will be 1B as long as the
battery lasts, then 1A.  Will try SSB QRP but will probably fall back to
some other mode depending on results.   My first FD so my expectations are
low.  :)

On Sat, Jun 9, 2018 at 14:20 Michael Blake  wrote:

> Charlie, I am really racking them up thus far.  One CW and one FT8 on 6M
> with my K3s.
>
> Michael Blake
> k9...@mac.com 
>
>
>
>
>
>
> > On Jun 9, 2018, at 2:17 PM, Charlie T  wrote:
> >
> > I'll be sitting out under a big pine tree in our yard with a couple
> portable
> > antennas, a radio and a big car battery.
> >
> > Or, was that a rhetorical question?
> >
> > 73, Charlie k3ICH
> >
> >
> > -Original Message-
> > From: elecraft-boun...@mailman.qth.net 
> On
> > Behalf Of aj4tf
> > Sent: Saturday, June 09, 2018 12:49 PM
> > To: elecraft@mailman.qth.net
> > Subject: [Elecraft] 2018 Field Day
> >
> > What are your Elecraft plans for Field Day?   I'll be on the air at W4UA
> > (High Point, NC) with K3S # 10669 and K2 # 7006.  The other two stations
> > will be some other "Y" gear...
> >
> > 73 de AJ4TF
> >
> >
> >
> >
> > __
> > 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 k9...@mac.com
>
> __
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>
-- 
72,
Rich Hurd / WC3T / DMR: 3142737
PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer
for Scouting
Latitude: 40.761621 Longitude: -75.288988  (40°45.68' N 75°17.33' W) Grid:
*FN20is*
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Re: [Elecraft] 2018 Field Day

[Jim Blanca]

Not sure what KK5W (Houston, TX area) will be this year; usually 8A or 9A,
but all the stations will be K3s or K3S’s.  I brought down my spare K3 from
Ohio and it will be a CW station, as I do NOT own any microphones!!

I hope everyone has a safe and enjoyable Field Day, see you on the bands.

73 de Jim - KE8G


On Sat, Jun 9, 2018 at 11:49 AM aj4tf  wrote:

> What are your Elecraft plans for Field Day?   I'll be on the air at W4UA
> (High Point, NC) with K3S # 10669 and K2 # 7006.  The other two stations
> will be some other "Y" gear...
>
> 73 de AJ4TF
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> __
> Elecraft mailing list
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Re: [Elecraft] Field Day rig experience

[Rick WA6NHC]

When the 7300 first came out, I took mine to FD for a test, with high 
hopes.  Proximity of antennas was close, on the order of 40 
(tribander)-200' (double double extended Zepp on 40M) separation, power 
output limited to 100 watts.  There was a lack of trees to make more 
space between antennas without exceeding the 1500' limitation (besides, 
the snacks were there).


The 7300 crumpled badly, operation on other bands 'desensed' (for lack 
of an accurate word) the 7300 effectively making it deaf in some cases.  
It didn't matter what band the other stations were operating on, the 
7300 was affected.


No band filters were employed, it was a brutal test as a 'worst case 
scenario'.  The 7300 failed.


The Pro-III the group normally uses, displayed no issues.  No one wanted 
to dis/re-assemble their Elecraft stations from home but I'm sure they'd 
hold up very well or better under the same test.  It wasn't a QRP event, 
so the KX2/3 was not deployed.


However it's limitations, the 7300 does exactly what I intend it to be, 
a cheap light weight radio with 100 watts out that I can take into the 
field, use in the RV or the home shack (since I can control other 
transmitters).  It isn't an 'unworthy' radio, if you don't subject it to 
high RF fields. Eventually, I'll have a second K3 just for the RV but 
for now the 7300 will suffice.


There will be two 7610 on site this year, but I won't be there to 
witness their use.  The Pro-III will be there in case the 7610 doesn't 
hold up.


Rick WA6NHC




On 6/9/2018 9:34 AM, Wayne Burdick wrote:

On Jun 9, 2018, at 5:24 AM, Bill  wrote:

How do the new technology ICOMs (7300 and 7610) do under the "several rigs on the 
same band" conditions? The size, weight, and cost factor is inviting for the 7300 - 
BUT!!! Is it up to the job? Close to up to the job? Or, better left home during these 
events?


Hi Bill,

Hopefully you’ll get some responses to this question from those with direct 
experience. But looking at it theoretically: both the 7300 and 7610 are 
direct-sampling radios with about 25-30 dB less blocking dynamic range than the 
K3 or K3S. On Field Day this could have a definite impact when using multiple 
transmitters on the same band, or even on different bands, depending on antenna 
spacing and power level used.

Dynamic range of all of these radios is quantified in the receiver performance 
table at www.sherweng.com, specifically the fifth column (“100 kHz Blocking”).

Wayne



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Re: [Elecraft] 2018 Field Day

[Michael Blake]

Charlie, I am really racking them up thus far.  One CW and one FT8 on 6M with 
my K3s.

Michael Blake
k9...@mac.com 






> On Jun 9, 2018, at 2:17 PM, Charlie T  wrote:
> 
> I'll be sitting out under a big pine tree in our yard with a couple portable
> antennas, a radio and a big car battery.
> 
> Or, was that a rhetorical question?
> 
> 73, Charlie k3ICH
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net  On
> Behalf Of aj4tf
> Sent: Saturday, June 09, 2018 12:49 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] 2018 Field Day
> 
> What are your Elecraft plans for Field Day?   I'll be on the air at W4UA
> (High Point, NC) with K3S # 10669 and K2 # 7006.  The other two stations
> will be some other "Y" gear...
> 
> 73 de AJ4TF
> 
> 
> 
> 
> __
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Re: [Elecraft] 2018 Field Day

[Charlie T]

I'll be sitting out under a big pine tree in our yard with a couple portable
antennas, a radio and a big car battery.

Or, was that a rhetorical question?

73, Charlie k3ICH


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of aj4tf
Sent: Saturday, June 09, 2018 12:49 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] 2018 Field Day

What are your Elecraft plans for Field Day?   I'll be on the air at W4UA
(High Point, NC) with K3S # 10669 and K2 # 7006.  The other two stations
will be some other "Y" gear...

73 de AJ4TF




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Re: [Elecraft] 2018 Field Day

[Erik Basilier]

I plan to participate using my K3, mostly on 40m, as part of the W7MOT team.
We do class 2A, and the other station uses a brand K rig.
73,
Erik K7TV

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of aj4tf
Sent: Saturday, June 09, 2018 9:49 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] 2018 Field Day

What are your Elecraft plans for Field Day?   I'll be on the air at W4UA
(High Point, NC) with K3S # 10669 and K2 # 7006.  The other two stations
will be some other "Y" gear...

73 de AJ4TF


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[Elecraft] [FS] KX3-F

[Bob via Elecraft]

For sale KX3-F (SN 5520) in very good to excellent condition with the 
following: KXFL3-F, KXAT3-F, KXBC3-F, KX3-2M-AT, KXPD3, MH3, XG50 (assembled), 
KXUSB cable, KX3-PCKT accessory cable set, PAE-Kx31 heatsink, SideKX panels 
(back-ordered cover never received), orange Pelican 1200 padded case, The 
Nifty! Mini-Manual for KX3 Plus Options, The Elecraft KX3 book (marked) by Fred 
Cady - KE7X, and power cable 18AWG with right angle plug (E850524).

Payment via Pay-Pal.  CONUS only.  $1800 shipped.

If interested, please contact me offline via email of BobK8RL at AOL.

Bob
K8RL

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Re: [Elecraft] Field Day rig experience

[donovanf]

Hi Wayne, 


Few K3 owners are aware that the K3 has built in transmit/receiver 
bandpass filters for each band. That and very low phase noise and 
exceptional receiver dynamic range are why the K3 is such a superb 
Field Day transceiver. 


At the W3AO Field Day we use four K3 transceivers on 20 meters: 
CW, SSB, Digital and GOTA. N one of the 20 meter operators will be 
aware of the other three transceivers u nless one of the other transceivers 
accidentally lands on the same frequency. 


Is there any published data about the performance of the built in 
bandpass filters? 


tks 


73 
Frank 
W3LPL 

- Original Message -

From: "Wayne Burdick"  
To: "Bill"  
Cc: "Elecraft Reflector"  
Sent: Saturday, June 9, 2018 4:34:53 PM 
Subject: Re: [Elecraft] Field Day rig experience 


> On Jun 9, 2018, at 5:24 AM, Bill  wrote: 
> 
> Along the line (lightly discussed under "K3- AF Knob") of what rigs are used 
> for dxpeditions and Field Day.. How do the new technology ICOMs (7300 and 
> 7610) do under the "several rigs on the same band" conditions? The size, 
> weight, and cost factor is inviting for the 7300 - BUT!!! Is it up to the 
> job? Close to up to the job? Or, better left home during these events? 


Hi Bill, 

Hopefully you’ll get some responses to this question from those with direct 
experience. But looking at it theoretically: both the 7300 and 7610 are 
direct-sampling radios with about 25-30 dB less blocking dynamic range than the 
K3 or K3S. On Field Day this could have a definite impact when using multiple 
transmitters on the same band, or even on different bands, depending on antenna 
spacing and power level used. 

Dynamic range of all of these radios is quantified in the receiver performance 
table at www.sherweng.com, specifically the fifth column (“100 kHz Blocking”). 

Wayne 



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[Elecraft] 2018 Field Day

[aj4tf]

What are your Elecraft plans for Field Day?   I'll be on the air at W4UA
(High Point, NC) with K3S # 10669 and K2 # 7006.  The other two stations
will be some other "Y" gear...

73 de AJ4TF



--
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Re: [Elecraft] Field Day rig experience

[Wayne Burdick]

> On Jun 9, 2018, at 5:24 AM, Bill  wrote:
> 
> Along the line (lightly discussed under "K3- AF Knob") of what rigs are used 
> for dxpeditions and Field Day..  How do the new technology ICOMs (7300 
> and 7610) do under the "several rigs on the same band" conditions? The size, 
> weight, and cost factor is inviting for the 7300 - BUT!!! Is it up to the 
> job? Close to up to the job? Or, better left home during these events?


Hi Bill,

Hopefully you’ll get some responses to this question from those with direct 
experience. But looking at it theoretically: both the 7300 and 7610 are 
direct-sampling radios with about 25-30 dB less blocking dynamic range than the 
K3 or K3S. On Field Day this could have a definite impact when using multiple 
transmitters on the same band, or even on different bands, depending on antenna 
spacing and power level used. 

Dynamic range of all of these radios is quantified in the receiver performance 
table at www.sherweng.com, specifically the fifth column (“100 kHz Blocking”).

Wayne



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Re: [Elecraft] Transmit Inhibit

[Bob Wilson, N6TV]

What amp. are you using and why do you need to use TX INH?  Perhaps it has
KEY IN / KEY OUT, and you can use that instead, to activate PTT on the
radio only when the amp. is "ready".  PTT signal or footswitch keys amp.,
amp. keys K3 PTT IN, instead of PTT/footswitch keying radio, and radio
keying amp.  Or you could set CONFIG:TX DLY to a large value.

If you must use the TX inhibit pin, 5V is available on K3 ACC Pin 1 (FSK
keying).  I use that plus a single resistor on my Simple K3 Lockout Circuit
(see https://bit.ly/K3lockout which downloads a PDF schematic).  The Y-BOX
 has this lockout circuit built in, as well as a 10K
pull-up resistor for a separate 5V source if the FSK pin is already in use
for RTTY.  But, the circuit uses TX INH LO and you need TX INH HIGH?

You could use the 12V from the amp. to key the base of an NPN transistor
(through a 1K resistor).  Ground the emitter and and connect a 470 ohm
resistor to the collector.  Connect other side of the resittor to the TX
INH pin and +5V (Pin 1), as in my lockout schematic.  When your amp outputs
12V, the transistor closes the circuit, and the INH pin goes low.   When
your amp. outputs 0V, that opens the circuit, and the INH line goes high
(+5V).

73,
Bob, N6TV

On Fri, Jun 8, 2018 at 8:12 PM, Clay Autery  wrote:

> I'm going to use ACC Pin #7 as Transmit Inhibit (High), and the manual
> says this:
>
> "TX INH (Transmit Inhibit Signal)
> Pin 7 of the ACC connector can be configured as a
> transmit inhibit input by setting CONFIG:TX INH
> to LO=Inh (or HI=Inh). Holding pin 7 low (or
> high) will then prevent transmit. An external 2.2 to
> 10 K pull-up resistor (to 5 VDC) is required.
> If TX INH is set to OFF, pin 7 reverts to its
> default output function, K3S ON (see above)."
>
> This has confused me a bit...  I'm not an electronic expert. The input
> signal is 12 vdc, present all the time EXCEPT when the K3s keys up... the
> amp gets that message and drops the signal to ) vdc...  Not sure how to
> pull off reducing the input from 12 to 5vdc with a single external resistor.
> I DO know how to do it with a voltage divider  Vout = Vin x
> R2/(R1+R2)  Calculate resistor values, tie them together at one end and
> that end connects to Pin #7 at K3s end.  R1's other end ties to the (+)
> signal in from amp, and R2's other end ties to the ground (conductor on Pin
> #5).
>
> Is there a simpler way to do this with a single resistor?  Am I missing
> something?
>
> And am I in fact reading the manual correctly?  The K3 expects a TTL logic
> level + 5 vdc on Pin #7 to activate inhibit with TX Inh set to "high"?  A
> straight 12vdc exceeds the spec for that pin as an input?  (When it's used
> as the K3s ON output to XVERTER, it OUTPUTS +5 VDC)
>
> I'm trying to get this custom cable built for this amp this weekend
> I'd appreciate a little help here.  I don't want to let the smoke out of
> anything
>
> 73,
>
> --
> __
> Clay Autery, KY5G
> (318) 518-1389
>
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[Elecraft] ARRL VHF/UHF contest starts today at 1800 UTC

[Wayne Burdick]

This is VHF/UHF contest weekend...see details at:

http://www.arrl.org/june-vhf

It'll be a great time to warm up the Ether on 50 MHz and above with your 
Elecraft gear. I myself will be roaming the hinterlands of CM87 on foot, armed 
only with 6 and 2-meter whips, a KX3, and a top-secret trail mix blend.

Keep your fingers crossed for some decent Sporadic E openings.

73,
Wayne
N6KR

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Re: [Elecraft] Transmit Inhibit

[Don Wilhelm]

Clay,

The answer lies in your driving device and not the K3.  Yes, a 12 volt 
source may damage the K3.
A simple voltage divider will not do the whole job.  That output must 
swing from 5 volts to zero volts., so at the the time the output should 
go to zero volts, the voltage divider will still be producing voltage.


Look at the schematic for the driving device.  What is the device 
providing the output?  A relay, or a solid state device?
If a relay, is it a SPDT relay with the output taken from the common? 
Is the NO contact connected to ground?  Is the NC contact connected to 
+12v - if so, remove the source of 12 volts and connect a 2.2 to 10k 
resistor to that contact with its other end connected to a source of 5 
volts.


If instead of a relay, the output is a solid state device (transistor or 
FET) disconnect the collector (or drain) resistor and replace it with a 
2.2k to 10k resistor with the other end connected to  source of 5 volts 
instead of 12 volts.


In other words, you will have to modify the driving device - 
alternately, you could add a device to the circuit (internally or 
externally) which takes the 12 volts as an input and uses a 2.2k to 10k 
collector (or drain) resistor terminated in 5 volts - a 2N7000 FET would 
work fine.
That output would go from 0 volts when the input is 12 volts and go to 
+5v when its input is 0 volts.


73,
Don W3FPR

On 6/8/2018 11:12 PM, Clay Autery wrote:
I'm going to use ACC Pin #7 as Transmit Inhibit (High), and the manual 
says this:


"TX INH (Transmit Inhibit Signal)
Pin 7 of the ACC connector can be configured as a
transmit inhibit input by setting CONFIG:TX INH
to LO=Inh (or HI=Inh). Holding pin 7 low (or
high) will then prevent transmit. An external 2.2 to
10 K pull-up resistor (to 5 VDC) is required.
If TX INH is set to OFF, pin 7 reverts to its
default output function, K3S ON (see above)."

This has confused me a bit...  I'm not an electronic expert. The input 
signal is 12 vdc, present all the time EXCEPT when the K3s keys up... 
the amp gets that message and drops the signal to ) vdc...  Not sure how 
to pull off reducing the input from 12 to 5vdc with a single external 
resistor.
I DO know how to do it with a voltage divider  Vout = Vin x 
R2/(R1+R2)  Calculate resistor values, tie them together at one end and 
that end connects to Pin #7 at K3s end.  R1's other end ties to the (+) 
signal in from amp, and R2's other end ties to the ground (conductor on 
Pin #5).


Is there a simpler way to do this with a single resistor?  Am I missing 
something?


And am I in fact reading the manual correctly?  The K3 expects a TTL 
logic level + 5 vdc on Pin #7 to activate inhibit with TX Inh set to 
"high"?  A straight 12vdc exceeds the spec for that pin as an input? 
(When it's used as the K3s ON output to XVERTER, it OUTPUTS +5 VDC)



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Re: [Elecraft] KPA1500 MARS Operation?

[Wayne Burdick]

We’re almost finished with MARS characterization, George. When the new firmware 
is released, the amp will be usable from 2-30 MHz with very few excluded 
segments. 

We’ll post full details next week. 

73,
Wayne 
N6KR


http://www.elecraft.com

> On Jun 9, 2018, at 4:49 AM, George Johnson W1ZT  wrote:
> 
> Looking for status of any MARS update for the KPA1500 for MARS operation.
> 
> My new amp is fine but just needs that ham band restriction modified as was
> done for the K3.
> 
> Have contacted Support but no info other than referral to FAQ which simply
> says MARS is supported.
> 
> Thanks for any suggestions,
> 
> George  W1ZT
> 
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[Elecraft] Field Day rig experience

[Bill]

Along the line (lightly discussed under "K3- AF Knob") of what rigs are 
used for dxpeditions and Field Day..  How do the new technology 
ICOMs (7300 and 7610) do under the "several rigs on the same band" 
conditions? The size, weight, and cost factor is inviting for the 7300 - 
BUT!!! Is it up to the job? Close to up to the job? Or, better left home 
during these events?


Kindly, no flames and let's answer here on the forum - so all can learn.

Thanks, Bill W2BLC K-Line
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[Elecraft] KPA1500 MARS Operation?

[George Johnson W1ZT]

Looking for status of any MARS update for the KPA1500 for MARS operation.

My new amp is fine but just needs that ham band restriction modified as was
done for the K3.

Have contacted Support but no info other than referral to FAQ which simply
says MARS is supported.

Thanks for any suggestions,

George  W1ZT

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