Re: [Elecraft] [OT] A dumb question about lightning

[Russ Tobolic via Elecraft]

I have the first edition of the ARRL book.  What is significant about the 
second edition that is different from the earlier edition?
Russ, N3CO 

Sent from Yahoo Mail on Android 
 
  On Fri, Jul 28, 2023 at 7:14 PM, Jim Brown wrote: 
  On 7/28/2023 1:31 PM, Al Lorona wrote:
> Please don't laugh at me; I'm a transplant from a region of the country with 
> essentially no lightning to a region where you have to worry about it quite a 
> bit.

The answer is, as KK9A said, to follow proper grounding and bonding to 
the letter. N0AX's ARRL Book on the topic, to which I contributed, is 
excellent. You want the Second Edition, published about a year ago. The 
book also references the slide deck for my tutorial talks. Don't let 
"audio" in the link fool you -- it's all about grounding and bonding in 
the shack for lightning protection and to minimize RFI.

http://k9yc.com/GroundingAndAudio.pdf

On 7/28/2023 3:04 PM, Keith Trinity WE6R wrote:
 > Please, PLEASE disconnect your COMPUTER from your radio(s) if lightning
 > is in the area!
 >
 > Almost ALWAYS lightning damaged gear that comes in for repair, was hit
 > _thru the comm port!_
 > (lightning hits Cable/DSL lines).

This is the result of failure to follow proper grounding and bonding, 
and the failure of equipment mfrs to properly bond cable shields to the 
chassis at the point of entry. That failure to common to all ham mfrs, 
including Elecraft. This construction error was first addressed in 1994 
by a ham working in pro audio, Neil Muncy, ex-W3WJE (SK), and he called 
it "The Pin One Problem," because Pin 1 of the XLR connectors used to 
carry balanced audio is the shield contact. I addressed it beginning on 
page 5 of this RFI tutorial, which started out life in 2007.

k9yc.com/RFI-Ham.pdf

A major contributor to that lightning damage are the MOV-based surge 
protectors provide power to interconnected equipment. The MOVs short to 
the green wire; the IR drop in the green wire from that current spike 
raises the reference potential for equipment plugged into it, and the 
difference between that and the chassis of interconnected equipment 
that's grounded somewhere else fries the interconnected circuitry. We 
started seeing this in pro audio systems in the early '90s, with no 
antennas involved. The solution was elimination of those MOV protectors, 
replacing them with series-mode units that stored surge in a monster 
inductor, then discharged it slowly as a trickle after the strike had 
passed.

A colleague blew out the Ethernet ports of computers in his small design 
office from exactly this mechanism. Again, no antennas were involved.

73, Jim K9YC
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Re: [Elecraft] Through-hole Replacement for K3 Q5 (2N7002)

[Russ Tobolic via Elecraft]

 Hello Pete:
I have some thru-hole 2N7000 in my junk box.  I can mail a couple to you if you 
want.
Russ, N3CO
On Thursday, October 21, 2021, 09:57:50 AM EDT, Pete Smith N4ZR 
 wrote:  
 
 The original surface-mount part seems to be back in stock in the US, but 
I'm afraid that what I need is a through-hole equivalent, because the PC 
board where the old one was mounted is a wreck (damage from part 
failure, plus my ham-handed efforts to replace it). Google thinks a 
2N7000 will do, but I'd sure like to get an expert opinion.

-- 
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at .
For spots, please use your favorite
"retail" DX cluster.

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Re: [Elecraft] KBPF3A switching frequencies and performance

[Russ Tobolic via Elecraft]

 Just an FYI, I found out what the problem is with my modified KBPF3.  I 
removed the added caps and signal levels returned to somewhat normal levels.  
Adding a cap to C2 didn't make sense and attenuated the signals. But Fig. 14 
shows adding a cap to C4.   Apparently the ham I bought this from used Rev. A1, 
June 24, 2015 instructions which have an error.  Figure 13 shows adding the 
0.1uF caps to C2, C3 and C6.  I downloaded Rev. A2 June 29, 2015 which 
correctly shows in fig. 13 to piggyback caps on C4, C3 and C6.  Problem solved!
Russ, N3CO
On Monday, April 19, 2021, 09:04:58 PM EDT, ab2tc  wrote:  
 
 Hi Russ,

Your response made *very* curious so I checked out my own K3S. I can confirm
the two switchover frequencies you mention (1700 and 3300kHz), but observe
at most a couple of dB change when crossing the boundaries. I use an
external panadapter (LP-PAN/NaP3 connected to IF-OUT) so I can easily see
the same stations and noise while tuning across the boundaries. On the
1700kHz boundary the signals are a couple, maybe 3dB stronger when below
1700kHz. So it sounds to me that the filters in your KBPF3A are not being
switched in when it is supposed to be used. The KBPF3 needs to be enabled
(set to "nor") in the configuration menu. Have you checked that?

Hmm, I neglected to carefully read the last part of your post. It sounds
like your KBPF3A might be working above 4210kHz so may be just the 2 lowest
bands are defective. If you look at the schematic you see that those two
bands use the same filter but with some components switched in and out by
another relay (K2). So that could narrow the problem down to one relay (K1)
not operating. Is this a *new* problem or has it been like this since you
got the K3 or installed the KBPF3A?

Knut - AB2TC


Elecraft mailing list wrote
> Hi Ben:
> You had me curious with your request.  I started to check my KBPF3
> (modified to the "A") and noticed something that now bothers me.  I tried
> going down from 160M and it appears that the switch over to the AM
> broadcast band occurs precisely at 1700,000  Kc.  When I tune to  1.69
> the relays click.  But the anomaly(?) I am seeing at the switchover point
> is a big drop in the signal level.  At my QTH during the daytime the
> nominal noise level at 1700.000 Kc is about S7.  When I switch to 1.69
> the noise level drops to S2.  At the high end the switchover occurs at
> 2109.999+ with a drop in the noise level from S9+10 to S3.  I don't use
> the K3 for listening to AMBCB but only in the case of checking my 160M 
> receiving loops with some stations high in the AM Band.  I checked on 80M
> and got similar results.  At the low side the switch occurred at 3299.999
> with a drop in the noise level from S5 to S2.  On the high side the
> switchover occurred at 4209.999+ but here the noise level increased from
> S4 to S6. I don't know if this helps you any on at least these 2 bands. 
> If I get the time I'll try to check the rest.  Now I'm bothered by the
> changes in signal levels at the switchover points (ignorance is bliss). 
>  I wonder if anyone else has ever noticed this or do I have an issue with
> my KBPF3?
> 
> Russ, N3CO
>    On Friday, April 16, 2021, 12:39:28 PM EDT, w4sc 

> w4sc@

>  wrote:  
>  
>  Looking for details of switch over frequencies and expected performance
> of the KBPF3A in its various bands, 
> 
> There is improvement in the BCB and below 500KHz with the KBPF3A enabled,
> however the other SW BCB bands I have tried are lacking.
> 
> Has anyone measured the performance of the KBPF3A?
> 
> Ben W4SC
> 
> Sent from Mail for Windows 10
> 
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Re: [Elecraft] KBPF3A switching frequencies and performance

[Russ Tobolic via Elecraft]

 Thanks Ben, I didn't think of that.  Now when the KBPF3 is not inst There is 
no difference in signal level when transitioning from 1.700 to 1.69.  And 
when I set the KBPF3 to nor (and reboot) there is a definite drop of 5-7 S 
units at the 1.700 transition point and also at the the 2.11 to 2.10999  
transition.  So there is definitely something in the low band signal path that 
is attenuating the signal.   I'll also do some checking at the other freqs.  I 
guess it's time to drag out the scope for some signal tracing which should be 
fun with SMDs and my old eyes.
Russ, N3CO
On Thursday, April 22, 2021, 09:09:47 AM EDT, w4sc  
wrote:  
 
 When setting installed/ NOT installed, make sure you reboot….
Ben

Sent from Mail for Windows 10

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Re: [Elecraft] KBPF3A switching frequencies and performance

[Russ Tobolic via Elecraft]

 Brian,Thanks for your information which got me thinking again about my 
situation.  I went back and set the config for the KBPF3 to "not inSt"  and 
found no difference at the signal levels at the switchover at 1700 Kc.  
Toggling back and forth between "not inSt" and "nor" I verified that there is 
no change in signal levels.  On the surface it appears that I purchased a 
broken used KBPF3.  Now I really have to take things apart to figure out what's 
wrong.
Russ, N3CO
On Tuesday, April 20, 2021, 07:23:37 PM EDT, Brian Hunt 
 wrote:  
 
 This thread also got my curiosity up.  Several years ago I upgraded my 
K3 #41xx with the KBPF3 including the 'A' mod of the capacitor on the RF 
board.  I never really checked it out except for the 630 meter coverage 
and transmit capability - both were as advertised.

Using a wideband noise generator (QRP Guys K7QO Noise Bridge) I tuned 
from about 500 kHz up to 30 Mhz and was able to identify the filter 
switch-over points (most of them anyway).  I measured the received noise 
level using the P3 dBm scale.  At none of the switch points was the 
noise level more than about 5 dB different from one side to the other.  
By continuously tuning and watching the display, it was apparent that 
the differences were mainly due to roll off of one filter segment or the 
other.  The gain was uniformly consistent across each of the ham bands 
but sometimes rolled off at the KBPF3 switch points.  The area between 
7.41 MHz and 8.4 MHz is kind of no-man's land due to the first IF being 
there.  At the IF frequency the gain was down >50 dB.

73,
Brian, K0DTJ

On 4/20/2021 08:57, w4sc wrote:
> A little back ground,,
>
> The effort started as a result of my using WWV at 15.00 MHz for 
> calibrating the reference oscillator.  Tuning from 14.99 to 15.00 MHz 
> I noticed a 9 to 12 Db drop in signal strength of WWV.
>
> ...
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Re: [Elecraft] KBPF3A switching frequencies and performance

[Russ Tobolic via Elecraft]

 Hi Knut:
I couldn't tell you if this is a new problem as I didn't notice anything amiss 
until I started checking switchover frequencies to answer W4SC's question.  I 
verified that the KBPF3 is enabled in the config menu.   I bought the used 
KBPF3 about 4-5 years ago from another ham and don't remember who it was.  It 
came with the instructions to modify it to the "A" version.  I can't remember 
if it was already modified or if I did it myself.  I do know that I did install 
the 220uF capacitor on the main board of the K3.  Arrrgh, I guess I'll have to 
tear everything apart to check if the mods were done correctly before 
proceeding.  Thanks for your information.
Russ, N3CO
On Monday, April 19, 2021, 09:04:58 PM EDT, ab2tc  wrote:  
 
 Hi Russ,

Your response made *very* curious so I checked out my own K3S. I can confirm
the two switchover frequencies you mention (1700 and 3300kHz), but observe
at most a couple of dB change when crossing the boundaries. I use an
external panadapter (LP-PAN/NaP3 connected to IF-OUT) so I can easily see
the same stations and noise while tuning across the boundaries. On the
1700kHz boundary the signals are a couple, maybe 3dB stronger when below
1700kHz. So it sounds to me that the filters in your KBPF3A are not being
switched in when it is supposed to be used. The KBPF3 needs to be enabled
(set to "nor") in the configuration menu. Have you checked that?

Hmm, I neglected to carefully read the last part of your post. It sounds
like your KBPF3A might be working above 4210kHz so may be just the 2 lowest
bands are defective. If you look at the schematic you see that those two
bands use the same filter but with some components switched in and out by
another relay (K2). So that could narrow the problem down to one relay (K1)
not operating. Is this a *new* problem or has it been like this since you
got the K3 or installed the KBPF3A?

Knut - AB2TC


Elecraft mailing list wrote
> Hi Ben:
> You had me curious with your request.  I started to check my KBPF3
> (modified to the "A") and noticed something that now bothers me.  I tried
> going down from 160M and it appears that the switch over to the AM
> broadcast band occurs precisely at 1700,000  Kc.  When I tune to  1.69
> the relays click.  But the anomaly(?) I am seeing at the switchover point
> is a big drop in the signal level.  At my QTH during the daytime the
> nominal noise level at 1700.000 Kc is about S7.  When I switch to 1.69
> the noise level drops to S2.  At the high end the switchover occurs at
> 2109.999+ with a drop in the noise level from S9+10 to S3.  I don't use
> the K3 for listening to AMBCB but only in the case of checking my 160M 
> receiving loops with some stations high in the AM Band.  I checked on 80M
> and got similar results.  At the low side the switch occurred at 3299.999
> with a drop in the noise level from S5 to S2.  On the high side the
> switchover occurred at 4209.999+ but here the noise level increased from
> S4 to S6. I don't know if this helps you any on at least these 2 bands. 
> If I get the time I'll try to check the rest.  Now I'm bothered by the
> changes in signal levels at the switchover points (ignorance is bliss). 
>  I wonder if anyone else has ever noticed this or do I have an issue with
> my KBPF3?
> 
> Russ, N3CO
>    On Friday, April 16, 2021, 12:39:28 PM EDT, w4sc 

> w4sc@

>  wrote:  
>  
>  Looking for details of switch over frequencies and expected performance
> of the KBPF3A in its various bands, 
> 
> There is improvement in the BCB and below 500KHz with the KBPF3A enabled,
> however the other SW BCB bands I have tried are lacking.
> 
> Has anyone measured the performance of the KBPF3A?
> 
> Ben W4SC
> 
> Sent from Mail for Windows 10
> 
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Re: [Elecraft] KBPF3A switching frequencies and performance

[Russ Tobolic via Elecraft]

 Hi Ben:
You had me curious with your request.  I started to check my KBPF3 (modified to 
the "A") and noticed something that now bothers me.  I tried going down from 
160M and it appears that the switch over to the AM broadcast band occurs 
precisely at 1700,000  Kc.  When I tune to  1.69 the relays click.  But the 
anomaly(?) I am seeing at the switchover point is a big drop in the signal 
level.  At my QTH during the daytime the nominal noise level at 1700.000 Kc is 
about S7.  When I switch to 1.69 the noise level drops to S2.  At the high 
end the switchover occurs at 2109.999+ with a drop in the noise level from 
S9+10 to S3.  I don't use the K3 for listening to AMBCB but only in the case of 
checking my 160M  receiving loops with some stations high in the AM Band.  I 
checked on 80M and got similar results.  At the low side the switch occurred at 
3299.999 with a drop in the noise level from S5 to S2.  On the high side the 
switchover occurred at 4209.999+ but here the noise level increased from S4 to 
S6. I don't know if this helps you any on at least these 2 bands.  If I get the 
time I'll try to check the rest.  Now I'm bothered by the changes in signal 
levels at the switchover points (ignorance is bliss).   I wonder if anyone else 
has ever noticed this or do I have an issue with my KBPF3?

Russ, N3CO
On Friday, April 16, 2021, 12:39:28 PM EDT, w4sc  
wrote:  
 
 Looking for details of switch over frequencies and expected performance of the 
KBPF3A in its various bands, 

There is improvement in the BCB and below 500KHz with the KBPF3A enabled, 
however the other SW BCB bands I have tried are lacking.

Has anyone measured the performance of the KBPF3A?

Ben W4SC

Sent from Mail for Windows 10

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Re: [Elecraft] Current Draw on 20M

[Russ Tobolic via Elecraft]

After reading your numbers here I was curious since my K3 is the same vintage 
as yours, serial 732, Apr'08.  I did a quick check on 20M and I am reading 
15.5A, @13.5V (on my Astron 20M meters) at 100W into a 50 ohm dummy load.  I 
checked other bands and read the following: 160M-15.5A, 75M-14A, 40M-14A, 
15M-13.6A, 10M-13A.  All readings were in the tune position using a LP-100.  I 
don't think the higher reading on 20 (or 160) is really significant.

Russ, N3CO
Sent from Yahoo Mail on Android 
 
  On Fri, Jun 19, 2020 at 1:55 PM, Mike Maloney wrote:   
FWIW, my old K3 (Nov'08) only pulls 17.8Adc at 12.5V for 100W into 50ohm dummy 
load at 14MHz.  
Seems to follow your PA temp is gonna run hotter also.  WHY such poor 
efficiency Elecraft, (Wayne) ?
73,Mike, AC5P


    On Friday, June 19, 2020, 12:03:45 PM CDT, Randy Farmer 
 wrote:  
 
 Mine does exactly the same thing. I even ran it through factory service 
to be sure there wasn't a problem with the LPF module that might be 
causing trouble. They calibrated it and returned it with a clean bill of 
health. It still draws significantly more current on 20 than on any 
other band.

73...
Randy, W8FN

On 6/19/2020 8:46 AM, Rich wrote:
> I just received my K3S back from repair and all seemed OK. However it 
> appears to draw much more current on 20M than any other band.   22 - 
> 24 amps.  I have tried two different 20m antennas and a dummy load.
>
> All other bands are 20 amps or lower.  Some as low at 17amps.
>
> Power Supply voltage per K3s display 14.0v standby and 13.3 on TX
>
> First off is this actually something of concern?
>
> I hate to do a calibration as it was just done by Elecraft service two 
> weeks ago.
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Re: [Elecraft] Low Power Output on 160 and 6 meters

[Russ Tobolic via Elecraft]

56" for the original cable is quite long. What gauge cable are you using?
Russ, N3CO

Sent from Yahoo Mail on Android 
 
  On Tue, Jun 25, 2019 at 10:05 AM, Everett via 
Elecraft wrote:   Hi Jim,
You brought up a good point that I had not thought of and that is the voltage 
drop at the K3S itself. So I set up the voltage reading a the VFO B window and 
noticed that the voltage had dropped down to 12.1V when I keyed down, but the 
power supply said 13.7V at key down. So I shortened the power cable, by 32" and 
now it is 24" long. Now I see 13.1V at VFO B window and 100 watt on 160 meters 
and 105 watts on 6 meters. I increased the power supply voltage to 14V and now 
I see 13.3V at VFO B window, on key down and now 105 watts out on 160 and 110 
out on 6 meters.
So to make a long story short, the K3S will put out over 100 watts on 160 and 6 
meters if your power supply voltage is at 13.8 volts and you keep the power 
cord short. The additional 32" of power cord dropped the voltage by 1 volt on 
key down.
Everett N4CY


In a message dated 6/25/2019 7:50:32 AM Central Standard Time, 
hamsh...@n4st.com writes:

I see the same output powers on my K3S.
Key down voltage is 13.4 volts on the VFO B display at maximum power out.
Elecraft offered to upgrade my PA chain for $100, but I'm not concerned
about ~1dB and is within spec for 6m anyway.
Glad that diode is in there.  I tested its function once.

_ 
73,
Jim - N4ST


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Don Wilhelm
Sent: Tuesday, June 25, 2019 08:31
To: EVERETT SHARP ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Low Power Output on 160 and 6 meters

Everett,

What is your power supply voltage during transmit at 100 watts as measured
with the Alternate VFO B display?

With a solid 13.8 volt power supply voltage, you should see no lower than
12.7 volts (there is a diode drop inside the K3).

If lower, check the connections in the power cable for tightness.
The K3 power cable should run direct from the power supply.  Rigrunner and
other DC power distribution boxes can be reason for excessive voltage drop.

You can increase the power supply voltage up to above 14 volts to help - do
not exceed 15 volts.

73,
Don W3FPR

On 6/24/2019 6:51 PM, EVERETT SHARP via Elecraft wrote:
> I have three K3S and over the week-end I connected each of them to my Bird
watt meter, with a Dummy load. Each of K3S were updated to the current
Firmware and each had the 5 and 50 watt calibrations run.
> 
> What I found was all 3 showed from 80 to 90 watts output on 160 meters 
> and on 6  meters I saw 75 to 90 watts. All other bands showed 
> typically
> 105 to 110 watts. However, one of the K3S showed exactly 100 watts on all
bands except for the lower power on 160 and 6 meters.
> 
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Re: [Elecraft] Headset/Mic Suggestions

[Russ Tobolic]

The Koss SB45 has been working great for me and cheaper than the CM500.  You 
can get them on Amazon for less than $30. Russ, N3CO

  From: Bill Gaines 
 To: elecraft@mailman.qth.net 
 Sent: Monday, December 5, 2016 4:46 PM
 Subject: [Elecraft] Headset/Mic Suggestions
   
Since I seldom use SSB I have not had the need to ask this question and I 
realize the responses may vary as much as belly buttons. I have a K3 and I also 
have the hand held microphone. I want to obtain a headset with an attached 
microphone to use with this radio just in case I may want to do some SSB work. 
I used to have a noise cancelling headset which I really liked because my shack 
is located in the laundry/utility room and it seems that the washer and/or 
dryer runs as often as the furnace does. The company that did make the noise 
cancelling headset no longer makes them so I am now trying to find out what 
other hams use or what is in the market place. I am especially interested in a 
noise cancelling headset with an attached microphone that sounds good on a K3.

Thank you Bill AD8P
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Re: [Elecraft] K3 radio no receive no transmit

[Russ Tobolic]

Do you have the new KSYN3A?  I just experienced a similar problem but tapping 
on the case didn't solve anything. Elecraft support determined I have a bad 
synthesizer. Russ, N3CO

  From: John K9UWA 
 To: Mailman  
 Sent: Thursday, April 7, 2016 9:42 PM
 Subject: [Elecraft] K3 radio no receive no transmit
   
My K3 is acting up a bit. No Receive No Transmit. I operate this radio 
remotely so all I can tell you is that it appears to be all working as per the 
HRD screen I am looking at. The radio appears to switch to transmit and I 
hear the monitor CW being sent but no output on the wattmeter.  The only 
noise coming from the radio is inter radio noise it the volume is turned to 
max. A slight TAP on the top of the case and the radio goes back into 
perfect normal operation. I am guessing that some plug someplace inside 
the radio isn't making proper contact. 

Does anyone have any idea which plug and its location?

Thanks
John k9uwa
John Goller, K9UWA & Jean Goller, N9PXF 
Antique Radio Restorations
k9...@arrl.net
Visit our Web Site at:
http://www.JohnJeanAntiqueRadio.com
4836 Ranch Road
Leo, IN 46765
USA
1-260-637-6426

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Re: [Elecraft] K3S Microphones

[Russ Tobolic]

I have K3 S/N 732 and use a $2 electret computer mic I bought at a yard sale.  
They had a white one that was only a $1 but I chose to go the more expensive 
route and buy the $2 black one to match the K3.  My settings are -16db  up to 
400 Hz, 0dB at 800-1600 Hz, and +16 dB at 2400 up and I get good audio reports. 
 After 8 years I did recently splurge and upgraded to the Koss SB-45 which 
works great. Russ, N3CO

  From: Bob McGraw K4TAX 
 To: elecraft@mailman.qth.net 
 Sent: Friday, February 12, 2016 8:08 AM
 Subject: Re: [Elecraft] K3S Microphones
   
I use a Heil PR 781 with great success.  The K3S TX EQ is set as follows;
  -16 dB @ 50 Hz, -12 dB @ 100 Hz, -6 dB @ 200 Hz,  and 2400 Hz @ +3 Db, 
3200 Hz @ +6 dB.

Working distance to the face of the mike is 4" to 5" on axis {one fist}  
so as not to enhance bottom end due to proximity effect, typical of 
dynamic mikes.    The MIC SEL is set for FP.H with the mike gain at 40 
and the COMP at 15.    The PR 781 is mounted on a small spring loaded 
desk boom that allows for easy placement for operation and moves easily 
out of the way when not needed.  I did make my own mike cable using some 
Belden 8771 which is 3 conductor shielded cable connecting between the 
XLR connector and the Foster connector.  The cable shield connects at 
the radio end only.

73
Bob, K4TAX
K3S, s/n 10163





On 2/11/2016 11:20 PM, grif80...@comcast.net wrote:
> As a new owner of a K3S, I'm wondering what the mix of microphones being used 
> is. What mikes provide the best audio?
>
> Jiim, KC0TRK
>


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Re: [Elecraft] Seeking loop Antenna Parts

[Russ Tobolic]

For the rope, try qualitynylonrope.com  I'm not sure if they have grey or brown 
but I bought a 500ft spool of 3/16"  black polyester for $42.  AND they have 
free shipping for orders over $25. Russ, N3CO

  From: Clay Autery 
 To: elecraft@mailman.qth.net 
 Sent: Wednesday, February 10, 2016 4:58 AM
 Subject: [Elecraft] Seeking loop Antenna Parts
   
So, based on a brief survey today, my first "real" antenna will be a
nominally horizontal delta loop, while I save for and get construction
designs approved for my tower.  I'm seeking some specific parts and
"preferred" vendors:

1) 3 each, 3" / 75mm MINIMUM diameter "plastic" (UV resistant) hanging
pulley with swivel eye, sealed ball bearings, for cable/cord diameter of
3/16"
I don't see what I want readily available.  I can build them, but I'd
prefer to not have to.  Yes, 75mm minimum diameter to minimize loop wire
wear/hardening and maximize freedom of movement.

2) 500-1000' Dacron/Polyester cordage in grey, brown, OD green, black in
that order.

3) 500' nominal, 14 AWG, THHN stranded annealed copper, gray.

4) telescopic pole, preferably cable of free-standing with loop
attachment NLT 30' with minimal tip flex.  I can build this using
locally sourced materials, some drilling, welding of supplemental
retention nuts, and tapping, etc, but I'd prefer to get this up in the air.
Alternatively, I could provide counter loop guy(s).

The rest I can likely source locally.  If I wasn't trying to get
operational "with dispatch", I'd simply custom build the pulleys and
station point pole.  I may still do so.

__
Clay Autery
KG5LKV

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Re: [Elecraft] 12 meter K3 RFI from nearby FM station

[Russ Tobolic]

What power are you running?  Try an experiment by turning the power level down 
or up thereby switching between the LPA and the KPA3 to see if this changes the 
intermod level. This may narrow it down to the TR switch.   I have had a 
similar problem with intermods between a couple of local AM stations.  The 
level of intermod changed quite noticeably switching between the output amps.  
The KPA3 and LP are using different switching diodes for the TR switch.

Russ, N3CO

  From: Jon Zaimes 
 To: 'Vic Rosenthal 4X6GP/K2VCO' ; 
elecraft@mailman.qth.net 
 Sent: Wednesday, February 10, 2016 12:10 PM
 Subject: Re: [Elecraft] 12 meter K3 RFI from nearby FM station
   
Thanks for the tips.

Any filter likely would have to be inserted internally, since I am getting
this RFI without any antennas connected to the radios.Unless it is coming in
on the 12v power cord, which is still a possibility. I only tried a couple
ferrites and they may not have been the right one for choking out the FM
signal.

I did observe that I am only hearing it on the main receiver in my K3 that
has a sub RX, but not on the sub RX. Also, while checking for this, and then
going back to the main RX, the RFI signal on the main RX was greatly
reduced. Perhaps a relay contact issue. It is still just as strong as
previous on my other K3 (which has no sub RX). Toggling through PRE and ATT
did not eliminate it (though changed signal level as it would for any
signal).

73/Jon AA1K

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Vic
Rosenthal 4X6GP/K2VCO
Sent: Wednesday, February 10, 2016 10:20 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 12 meter K3 RFI from nearby FM station

Jon,

I had a similar problem with a 50 kW AM BC station a few miles away. It
turned out to be strong enough to override the bias in the K3's T/R switch.
I built a high-pass filter which solved the problem.

You would need a low-pass filter in your case. Make sure it can handle 100w,
because you must connect it in the main antenna path -- the RX in/out path
is before the T/R switch.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 10 Feb 2016 16:58, Jon Zaimes wrote:
> I had been noticing some RFI on 12 meters for some time that I 
> initially had thought was power line noise. My use of 12 meters is 
> seldom so it wasn't very high up on the list of things to track.
>
> When I was reminded of it while listening for VP8STI recently, I did a 
> little more snooping and realized it was actually splatter from a BC 
> signal at the low edge or slightly below the 12 meter band, centered 
> about 24.89 mHz but audible from 24.87-24.91 mHz.
>
> The distorted splatter is audible as a BC station, all talk, no music, 
> but not clear enough to decipher any ID.
>
> A few days ago I decided to try to pinpoint the source, so listened to 
> the RFI on one ear while scanning the AM and SW bands with the sub RX 
> on the other ear. But I could find no matches, though did find the 
> splatter popped up centered on these additional frequencies:
>
> 813 kHz
> 996 kHz
> 2.820 mHz
> 3.626 mHz
> 19.4 mHz
>
> Figuring it must be an FM BC station, I started going through a list 
> of Delaware FM stations and on the third one, 91.1 mHz, matched the 
> audio peaks to my splatter. Further research determined this was a 
> public radio station with a transmitter on a commercial tower just a half
mile west of my QTH!
> While I of course was aware of the tower, which I knew to carry a 
> couple of cell sites and trunking radio, I hadn't been aware of the FM 
> station, which has apparently been there about 2 years. FCC data shows 
> it has 2.1 KW ERP. I had not had any previous issues with the site over
the past 17 years.
>
> Thinking that mixing or rectification might be produced either at the 
> TX site or on my own QTH, I decided to track with my mobile rig, an 
> IC-706 MK2G. But there was NO evidence of the splatter on the 706.
>
> Further debugging found that I was hearing the same splatter on BOTH 
> of my
> K3 radios (no. 3021 and 3057). Even when ALL cables are removed (only 
> the power lead connected). Grounding or ungrounding made no change. I 
> tried the radios on a battery but still had the RFI. Tried some 
> ferrites on the power lead but no change.
>
>
> So I'm thinking now there's some internal mixing in the K3 going on, 
> and wondering if any others have had similar issues and found any
solution.
>
> 73/Jon AA1K
> Felton, Delaware
> www.aa1k.us
>
>
>
>
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> k2vco@gmail.com
>

Re: [Elecraft] W6SFM Bug Roundup is working NOW!

[Russ Tobolic]

Will my old K3 #732 work with my Vibroplex or will I need the K3s?  I want to 
make sure I have all the latest.  Or I guess I could just use my HT-32As. Russ, 
N3CO
  From: ARRL - N6MQL n6...@arrl.net
 To: elecraft@mailman.qth.net 
 Sent: Saturday, May 16, 2015 1:40 PM
 Subject: [Elecraft] W6SFM Bug Roundup is working NOW!
   
For those of you who are interested in actually getting on the air, 
instead of hanging out here on the chat room... The W6SFM Bug Roundup 
Event is going on now! Signals are being heard on 10,15, 20, 40 and 80 
meters.  I've got my Bug from 1918 out and having fun on the air with 
other Bug Key operators.  Hope some of you decide to turn off the 
computer and join me too! 73,

Michael
N6MQL
For more info: http://www.w6sfm.com/Bug_Roundup.html
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[Elecraft] Fw: Fw: Interesting K3 QRM problem

[Russ Tobolic]

 Thanks Lexa and Joe, I see what you are saying about the PIN diode switch.  
Looking at the schematic, the T/R switch for the LPA uses the MA4P which is a 
true high power pin diode, but the KPA3 actually uses the S1M which is a 
rectifier diode.  It makes me wonder why different type were used in the two 
designs.  I assume this is correct since my K3 is one of the early ones (S/N 
732).  I t looks like both can handle 1A forward current.   So... it looks like 
my options are to take apart my old faithful K3 (again) and change the resistor 
R58 as you suggested, or try to fabricate a high power bandpass or high pass 
filter, or just ignore it and stay away from 1840.  I guess I'll have to 
seriously consider the first option.

Russ, N3CO


On Tuesday, November 11, 2014 9:38 AM, Joe Subich, W4TV li...@subich.com 
wrote:
 



 What helps - increasing current in diode switch on KPA board -
 change  of R25 to cca 65 Ohm and there are no IMD products as before.

This would tend to explain why Russ sees a more of a problem at low
power than at high power.  Current through the receive diodes in the
KPA3 is about three times as much as those on the RF board (13/200 vs.
7/320).

One would need to look carefully at the specifications of the PIN
diodes and the FETs being used for switching.  However, the resistors
to tweak would be R58 on
 the mainboard and R25 (as Lexa mentions)
on the KPA3.  The idea would be to keep the diodes turned on hard
enough to prevent them from turning off on RF peaks.

73,

... Joe, W4TV


On 2014-11-11 5:03 AM, alexandr.kobra...@seznam.cz wrote:
 Hi Russ,
 the same problem was here with BC station abt 5km away. Only with KPA in the
 chain.
 What helps - increasing current in diode switch on KPA board - change of R25
 to cca 65 Ohm and there are no IMD products as before.
 Hope this can help in any similar case in very special configuration of
 local BC
 station and non resonant ant used for higher bands.
 (I had IMD problems from 14MHz up, with with LW ant, BC station on 1062kHz)

 GL  73!
 Lexa, ok1dst


 -- Původní zpráva --
 Od: Russ Tobolic eru...@att.net
 Komu: Elecraft@mailman.qth.net Elecraft@mailman.qth.net
 Datum: 10. 11. 2014 17:17:51
 Předmět: [Elecraft] Fw: Interesting K3 QRM problem

 In this recent discussion here
 on K3 QRM from strong local broadcast
 stations, W4TV brought up the noise generated in the T/R switching diodes.
 In doing some experimentation with a bandpass flter in the loop between the
 RX antenna out and in on the KXV3A I have discovered something which has
 baffled me. I have a 2KW station on 1480 kc 1.5 miles north of me and a 20KW
 station on 1300 kc about 5 miles south of me. The 1300 station is
 directional north and I am right in the boresight. I am experiencing +30 to
 +40 dB over S9 intermod from these two stations on 1840 kc. An intermod
 calculator shows a 5th order intermod at 1840 from the two stations. I
 normally run QRP at 5W cw and what I have discovered is that when I crank up
 the power above 15W (activating the KPA3), the
 intermod drops to about +5 to
 +10 dB over S9. This behavior is very consistent when switching between low
 and high power.

 Can anyone explain this or is something broke in my K3?

 Thanks,
 Russ, N3CO





 On Thursday, October 23, 2014 4:52 PM, Joe Subich, W4TV li...@subich.com
 wrote:




 Maybe, and if you're right, my suggestion may not help. But you
 misunderstood my suggestion. There is an insert point between the
 T/R switch
 and the RX input. That's the RX loop I was talking about
 -- you insert the filter there.

 The insert point is *after* the PIN diode T/R switches for both the HPA
 (KPA3) and 10W LPA. Given Vic's description, it is likely the noise is
 being generated in one or more of the PIN diodes in the T/R switching
 and placing the highpass filter in the insert point will not resolve
 the noise. Vic, you can bypass (disable) the KPA3 to see if the noise
 generation is in the KPA3 T/R switch.

 73,

 ... Joe, W4TV
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[Elecraft] Fw: Interesting K3 QRM problem

[Russ Tobolic]

In this recent discussion here on K3 QRM from strong local broadcast stations,  
W4TV brought up the noise generated in the T/R switching diodes.   In doing 
some experimentation with a bandpass flter in the loop between the RX antenna 
out and in on the KXV3A I have discovered something which has baffled me.   
I have a 2KW station on 1480 kc 1.5 miles north of me and a 20KW station on 
1300 kc about 5 miles south of me.  The 1300 station is directional north and I 
am right in the boresight.  I am experiencing +30 to +40 dB over S9 intermod 
from these two stations on 1840 kc.  An intermod calculator shows a 5th order 
intermod at 1840 from the two stations.   I normally run QRP at 5W cw and what 
I have discovered is that when I crank up the power above 15W (activating the 
KPA3), the intermod drops to about +5 to +10 dB over S9.  This behavior is very 
consistent when switching between low and high power.  

Can anyone explain this or is something broke in my K3?

Thanks,
Russ, N3CO





On Thursday, October 23, 2014 4:52 PM, Joe Subich, W4TV li...@subich.com 
wrote:
 



 Maybe, and if you're right, my suggestion may not help. But you
 misunderstood my suggestion. There is an insert point between the
 T/R switch and the RX input. That's the RX loop I was talking about
 -- you insert the filter there.

The insert point is *after* the PIN diode T/R switches for both the HPA 
(KPA3) and 10W LPA.  Given Vic's description, it is likely the noise is
being generated in one or more of the PIN diodes in the T/R switching
and placing the highpass filter in the insert point will not resolve
the noise.  Vic, you can bypass (disable) the KPA3 to see if the noise
generation is in the KPA3 T/R switch.

73,

... Joe, W4TV
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Re: [Elecraft] mic compression

[Russ Tobolic]

The DIP version of the SSM2165 is no longer available from ADI.

Russ, N3CO
K2 #4016
- Original Message -
From: Donald K. Duncan [EMAIL PROTECTED]
To: Nicholas Lokuciewski [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Wednesday, January 05, 2005 4:52 PM
Subject: Re: [Elecraft] mic compression




 Does anyone know where I can get a sample of the Analog Devices SSM2165
Mic
 Preamp IC (as used on the K2 SSB adapter board)? Only need one or two,
but
 the DIP packaged version would be lovely (even these young eyes have
 problems with SMD). I've checked the AD site and they dont advertise
 samples.


 digikey.com has the surface mount version.  I don't see a dip version
 there.


 ~Don
 
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Fw: [Elecraft] 10m Birdie

[Russ Tobolic]

I never operate 10M but just checked my K2 with the KPA100 and found the
same thing with a strong birdie at around 28262.  The weird thing is that
when I turned off the KPA100 (reducing power below 10W) the birdie at 28262
shifted up about 1kc and the birdie at 28019 shifted down about 500c.

Russ, N3CO
K2 #4016
- Original Message -
From: [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Sunday, January 02, 2005 11:19 AM
Subject: [Elecraft] 10m Birdie


 In order to get a match at 28019 kHz as has been reported,=
  the KPA100
 oscillator has to be shifted to 18434.1 

 Hi also have the 28029 birdie.  I've also got the much stronger=
  28262
 birdie.

 I've wanted to eliminate this for some time since there a lot of=
  cw activity
 between 28025 and 28025.  My KPA100 is installed on the K2.  The=
  birdie
 produces about 1 s unit bar with the pre-amp on.  Based on Sverre=
  comments,
 how do I eliminate the birdie?  Is it merely the freq of the 18=
  MHz
 oscillator.

 Frank, W4FMS



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 No virus found in this incoming message.
 Checked by AVG Anti-Virus.
 Version: 7.0.298 / Virus Database: 265.6.7 - Release Date: 12/30/04





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No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.298 / Virus Database: 265.6.7 - Release Date: 12/30/04

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Fw: [Elecraft] 10m Birdie

[Russ Tobolic]

I never operate 10M but just checked my K2 with the KPA100 and found the
same thing with a strong birdie at around 28262.  The weird thing is that
when I turned off the KPA100 (reducing power below 10W) the birdie at 28262
shifted up about 1kc and the birdie at 28019 shifted down about 500c.

Russ, N3CO
K2 #4016

- Original Message - 
From: [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Sunday, January 02, 2005 11:19 AM
Subject: [Elecraft] 10m Birdie


 In order to get a match at 28019 kHz as has been reported,=
  the KPA100
 oscillator has to be shifted to 18434.1 
 
 Hi also have the 28029 birdie.  I've also got the much stronger=
  28262
 birdie.
 
 I've wanted to eliminate this for some time since there a lot of=
  cw activity
 between 28025 and 28025.  My KPA100 is installed on the K2.  The=
  birdie
 produces about 1 s unit bar with the pre-amp on.  Based on Sverre=
  comments,
 how do I eliminate the birdie?  Is it merely the freq of the 18=
  MHz
 oscillator.
 
 Frank, W4FMS
 
 
 
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 Elecraft mailing list
 Post to: Elecraft@mailman.qth.net
 You must be a subscriber to post to the list.
 Subscriber Info (Addr. Change, sub, unsub etc.):
  http://mailman.qth.net/mailman/listinfo/elecraft
 
 Help: http://mailman.qth.net/subscribers.htm
 Elecraft web page: http://www.elecraft.com
 
 
 
 -- 
 No virus found in this incoming message.
 Checked by AVG Anti-Virus.
 Version: 7.0.298 / Virus Database: 265.6.7 - Release Date: 12/30/04
 
 


-- 
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.298 / Virus Database: 265.6.7 - Release Date: 12/30/04

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