[Elecraft] Backlight Parts for K2

[W4IEN]

If anyone has the parts for the backlight mod for the K2 and are willing to 
sell them I am interested.  Please let me know price.  Thanks in advance.

72/73,
EM73vx
Robin
G-QRP #12386
SKCC #7294
W4IEN 
w4...@comcast.net


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Re: [Elecraft] Antenna tuners

[Rick NK7I]

Save one; the screwdriver antenna on my truck is tuned (coil adjusted) by the 
TurboTuner attached to my radio until a match is found. 

And an argument could be made that a SteppIR controller performs a similar 
function. 

The rest are matching circuits to compensate for the disparity of input to 
output.  

73,
Rick NK7I

Email spiel Czech corruptions happen

> On Jul 17, 2020, at 7:00 PM, Fred Jensen  wrote:
> 
> No antenna has, at any time, anywhere in any of our lifetimes, been "tuned" 
> by an "antenna tuner."  So called antenna tuners are 2-port impedance 
> matching networks ... all of them ... and their job is to match the impedance 
> on one port to another impedance on the second port, period.  Nothing gets 
> "tuned."  They come in a variety of flavors ... a pair of push-pull 807's 
> with a resonant tank and a link feed to the antenna on open wire line is one. 
>  Everything that happens on the feed line [regardless of it's construction] 
> is the sole result of the complex impedance at the antenna feed point and the 
> characteristic impedance of the feedline.  No magic.
> 
> 73,
> Fred ["Skip"] K6DGW
> "Captain Obvious"
> Sparks NV DM09dn
> Washoe County
> 
>> On 7/17/2020 5:14 PM, Ken Roberson via Elecraft wrote:
>>  Kurt,
>> We are not tuning the antenna , we are matching the antenna to the coax at 
>> the base of the antenna.
>> 73 Ken K5DNL
>> 
>> On Friday, July 17, 2020, 7:10:32 PM CDT, Kurt Pawlikowski 
>>  wrote:
>> Ken: In some respects, a "matching device" at the base of the antenna is 
>> a tuner! {'-) It accomplishes the same function... {'-) k WB9FMC
>>On 7/17/2020 6:34 PM, Ken Roberson via Elecraft wrote:
>> Antenna tuners
>> 
>> I never use an antenna tuner , on the MF and LF bands realmen use a 
>> scopematch at the
>> 
>> Output of the Power Amp and a matching device at the base ofthe vertical 
>> antenna – HI Hi.
>> 
>> 73 Ken K5DNL
>> 
> 
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Re: [Elecraft] Antenna tuners

[David Gilbert]

That's not in the least true, but those among us fixated on semantics 
continue to push that tired old myth.


You could, for example, have an antenna with a feedpoint impedance of 50 
- j40 ohms, and if you insert 40 ohms worth of inductance in series with 
the feedline at the feedpoint you will TUNE that antenna to resonance 
exactly the same as if you put an appropriate amount of reactance in the 
antenna itself or adjust its length ... all of which do exactly the same 
thing.  The antenna and it's feedline are inseparable as far as the 
overall network is concerned.  One is not independent of the other ... 
ever.


Furthermore, the adjustment (i.e., "tuning") can be done at the shack 
end of the feedline with EXACTLY the same effect except for the 
transmission line transformation by the feedline, and of course its 
associated loss, since whatever is done at the shack end is reflected 
back to the antenna end.


Yours is really a very tedious distinction that has no basis in actual 
physics or network theory.


73,
Dave   AB7E



On 7/17/2020 6:59 PM, Fred Jensen wrote:
No antenna has, at any time, anywhere in any of our lifetimes, been 
"tuned" by an "antenna tuner."  So called antenna tuners are 2-port 
impedance matching networks ... all of them ... and their job is to 
match the impedance on one port to another impedance on the second 
port, period.  Nothing gets "tuned."  They come in a variety of 
flavors ... a pair of push-pull 807's with a resonant tank and a link 
feed to the antenna on open wire line is one. Everything that happens 
on the feed line [regardless of it's construction] is the sole result 
of the complex impedance at the antenna feed point and the 
characteristic impedance of the feedline.  No magic.


73,
Fred ["Skip"] K6DGW
"Captain Obvious"
Sparks NV DM09dn
Washoe County


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Re: [Elecraft] Antenna tuners

[John Magliacane via Elecraft]

 On Friday, July 17, 2020, 10:03:24 PM EDT, Fred Jensen  
wrote:

> No antenna has, at any time, anywhere in any of our lifetimes, been
> "tuned" by an "antenna tuner."

Unless the "tuner" is simply a broadband transformer, I might agree.

But if the "tuner" is an LC network, like an adjustable L network, T network, 
Pi network, or a linked-coupled network, then I strongly disagree.

A tuner is a 2-port network. A transmission line is also a 2-port network. Both 
networks obey reciprocity, meaning that what you do to one port of the network 
will have a direct influence on the opposite end.

That being said, if an antenna exhibits a complex impedance at our frequency of 
interest, and that behavior can be corrected (brought to resonance) by the 
application of a particular value of reactance at the antenna's feedpoint, then 
that application of reactance can, for reasons of convenience, be made at the 
"shack end" of the transmission line. As such, the "tuner" in the shack is 
really "tuning" the antenna!

There's no "magic" involved here -- just a simple understanding that things 
that are connected together actually behave like they're connected together. A 
transmission line doesn't isolate the shack from the antenna: It couples them 
together with the highest degree of efficiency we can muster/afford. Therefore, 
what happens at one end of a transmission line DIRECTLY affects the other, and 
vice versa.

And so, properly applying an adjustable LC impedance matching network in the 
shack CAN (and often does) modify the resonant frequency of an antenna.


73 de John, KD2BD
  
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Re: [Elecraft] Matching resonant antennas

[Barry LaZar]

Lyn,

    That's a reasonable design, and if you have it high, I am not 
surprised it's working out well for you. Not every ham has the liberty 
to put up, grow, an antenna farm. I am in that position. I have only two 
antennas up, a 20 meter vertical dipole center fed which I operate 20-10 
and feed it with ladder line and an 160 meter inverted L fed at the base 
with a remote tuner. I also have 5 elevated radials of varying length 
connected to the remote tuner , just because. Collectively, they work 
out well. It sometimes amazes me how some wire in a tree or two can be 
used to reach out and touch people. :-) I have never used a beam, but I 
do have a KPA500 and matching tuner which I use primarily for working 
100% duty cycle digital modes. All of my contesting and DX work has been 
at the 100 Watt level, except Field Day when I run QRP. So, good going 
and luck.


73,

Barry

K3NDM


On 7/17/2020 9:18 PM, Lyn Norstad wrote:

Barry -

+1

I use nothing but 600 ohm OWL (True Ladder Line) and a short piece of coax 
connects to a 1:1 / 4:1 hybrid balun to allow matching the impedance perfectly 
with my KAT500.

The antenna is a 360' center fed EDZ (design frequency of 3.5 MHz).  The KAT500 
matches it on all bands 160 - 6m (on 15m, it bypasses).

The measured performance indicates  excellent radiation on all bands.

73
Lyn, W0LEN


-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Barry LaZar
Sent: Friday, July 17, 2020 7:44 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Matching resonant antennas

Wes,

  You're correct that open wire/ladder line transmission lines are
not a panacea. But, in the average ham stations, open wire does overcome
high losses with high SWR, or not so high SWR. What is needed is a look
at the ARRL Antenna book for transmission line loss/100 ft. as a
function of SWR. You see that on 10 meters running 10:1 SWR the total
loss is around 1 db. And, as you go to the lower bands, losses become
less. Typical 400 Ohm ladder line has a loss of 0.2 db at 10 MHz and 0.6
db at 100 MHz. Using these data and a little interpolation, I would use
0.4 db on 10 meters and a 10:1 SWR for this to be 0.8 db of additional
loss for a total of about 1.2 db. Yes, I do use a balun and recommend
them so add another 0.5 db. Add another 0.5 db for a good tuner and we
end up with a total of 2.2 db. on 10 meters and less on 20 and it
decomposes to an academic exercise on 40 and down.

  Coax on 10 starts out with a higher loss/100 feet. I will use what
I use here in K3NDM, Times LMR400. That represents 0.4 at 10 MHz. and
1.4 db at 100 MHz. That will yield about 1.2 db/100 ft on 10 meters. Add
0.25 db for a 2:1 SWR and 0.5 for tuner loss and you end up with about
1.95 at a 2:1 SWR.

  Here coax wins IFF the SWR remains less than 2:1 which won't happen
over the entire commonly used portion of the band. Using ladder line
vice coax will contain losses over the entire band. This keeps things
simple and the cost should be a lot less.

  As to the RCA station with a 14:1 SWR, they used no balun nor tuner
as we commonly know them today. The coupling to the final tube(s) were
balanced and was capable of making the transformation from what the tube
wanted and the reflected impedance at the transmitter end of the
transmission line. Ergo, they had a very low loss if using 10 meters
which they didn't. They typically used frequencies below 18 MHz and a
slug of power.

Vy 73,

Barry

K3NDM


On 7/17/2020 6:57 PM, Wes wrote:

I wrote about some of this in my paper ARRL Antenna Compendium paper
on ladder line 20 years ago. https://sadxa.org/n7ws/Ladder_Line.pdf

I've seen pictures of those SW transmitting plants and always assumed
that they must have been very efficient.  Upon reflection---no pun
intended---now I'm not so sure.  If losses mounted up, (which they
most certainly did at 14:1 SWR) they had the option of just turning up
the wick.

Furthermore, as I said in closing: "Contrary to the conventional
wisdom, ladder line is not a panacea for every transmission line
problem."  In the ensuing 20 years, I've become even more convinced of
this.  When tuner and balun losses are factored into this picture I
don't know why anyone would want to use this stuff.  I sure don't.

I have a KAT500 and use it to tune some way-off resonant antennas (fed
with 7/8" Heliax) but I don't delude myself into thinking "I've
contained system losses."

Wes  N7WS
https://www.qrz.com/db/N7WS


On 7/17/2020 2:32 PM, Barry LaZar wrote:

Resonance is over rated. The problem of believing you must have a
resonant antenna arose with the use of coax cable began. High SWRs
causes high system losses.

Prior to the widespread use of coax, open wire was used and few
antenna systems were really resonant, and nor were they reflecting a
1:1 SWR. Back then, no one cared as tubes were used and pi-net or
swinging links were used to match to whatever was connected to 

Re: [Elecraft] Antenna tuners

[Fred Jensen]

No antenna has, at any time, anywhere in any of our lifetimes, been 
"tuned" by an "antenna tuner."  So called antenna tuners are 2-port 
impedance matching networks ... all of them ... and their job is to 
match the impedance on one port to another impedance on the second port, 
period.  Nothing gets "tuned."  They come in a variety of flavors ... a 
pair of push-pull 807's with a resonant tank and a link feed to the 
antenna on open wire line is one.  Everything that happens on the feed 
line [regardless of it's construction] is the sole result of the complex 
impedance at the antenna feed point and the characteristic impedance of 
the feedline.  No magic.


73,
Fred ["Skip"] K6DGW
"Captain Obvious"
Sparks NV DM09dn
Washoe County

On 7/17/2020 5:14 PM, Ken Roberson via Elecraft wrote:

  Kurt,
We are not tuning the antenna , we are matching the antenna to the coax at the 
base of the antenna.
73 Ken K5DNL

 On Friday, July 17, 2020, 7:10:32 PM CDT, Kurt Pawlikowski 
 wrote:
  
   
Ken: In some respects, a "matching device" at the base of the antenna is a tuner! {'-) It accomplishes the same function... {'-) k WB9FMC
  
  On 7/17/2020 6:34 PM, Ken Roberson via Elecraft wrote:
   
  Antenna tuners


I never use an antenna tuner , on the MF and LF bands realmen use a scopematch 
at the

Output of the Power Amp and a matching device at the base ofthe vertical 
antenna – HI Hi.

73 Ken K5DNL



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Re: [Elecraft] Antenna tuners

[John Magliacane via Elecraft]

 On Friday, July 17, 2020, 7:10:32 PM CDT, Kurt Pawlikowski  
wrote: 
 
> Ken: In some respects, a "matching device" at the base of the antenna is a 
> tuner! {'-) It accomplishes the same function... {'-) k
> WB9FMC

On Friday, July 17, 2020, 08:21:54 PM EDT, Ken Roberson via Elecraft 
 wrote:

> Kurt,
> We are not tuning the antenna , we are matching the antenna to the coax at 
> the base of the antenna.
> 73 Ken K5DNL

Kurt's correct. A low-loss (non-resistive) matching network connected directly 
at the feedpoint of an antenna will modify its resonant frequency.

A matching network connected to the feedpoint of an antenna through 1 inch 
(25.4mm) of transmission line will also modify the resonant frequency of the 
antenna.

A matching network connected through 1 meter of transmission line will also 
modify the resonant frequency of the antenna.

A matching network connected through 10 meters of transmission line will also 
modify the resonant frequency of the antenna.

And so on, and so forth... all the way back to the shack! ;-)

Why? Because transmission lines obey reciprocity. As such they cannot (aside 
from the effects of losses) separate what's on their source end from what's on 
their load end. What you do to one end directly affects the other, and vice 
versa.

Show me a transmission line that disobeys this property, and I'll show you a 
line that is either opened or shorted.

So, yes, a non-resistive matching network in the shack will bring your antenna 
SYSTEM (antenna + transmission line) into resonance at your operating 
frequency. In the process, the resonant frequency of the antenna is modified, 
as well.


73 de John, KD2BD
  
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Re: [Elecraft] Matching resonant antennas

[Lyn Norstad]

Barry -

+1

I use nothing but 600 ohm OWL (True Ladder Line) and a short piece of coax 
connects to a 1:1 / 4:1 hybrid balun to allow matching the impedance perfectly 
with my KAT500.

The antenna is a 360' center fed EDZ (design frequency of 3.5 MHz).  The KAT500 
matches it on all bands 160 - 6m (on 15m, it bypasses).

The measured performance indicates  excellent radiation on all bands.

73
Lyn, W0LEN


-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Barry LaZar
Sent: Friday, July 17, 2020 7:44 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Matching resonant antennas

Wes,

 You're correct that open wire/ladder line transmission lines are 
not a panacea. But, in the average ham stations, open wire does overcome 
high losses with high SWR, or not so high SWR. What is needed is a look 
at the ARRL Antenna book for transmission line loss/100 ft. as a 
function of SWR. You see that on 10 meters running 10:1 SWR the total 
loss is around 1 db. And, as you go to the lower bands, losses become 
less. Typical 400 Ohm ladder line has a loss of 0.2 db at 10 MHz and 0.6 
db at 100 MHz. Using these data and a little interpolation, I would use 
0.4 db on 10 meters and a 10:1 SWR for this to be 0.8 db of additional 
loss for a total of about 1.2 db. Yes, I do use a balun and recommend 
them so add another 0.5 db. Add another 0.5 db for a good tuner and we 
end up with a total of 2.2 db. on 10 meters and less on 20 and it 
decomposes to an academic exercise on 40 and down.

 Coax on 10 starts out with a higher loss/100 feet. I will use what 
I use here in K3NDM, Times LMR400. That represents 0.4 at 10 MHz. and 
1.4 db at 100 MHz. That will yield about 1.2 db/100 ft on 10 meters. Add 
0.25 db for a 2:1 SWR and 0.5 for tuner loss and you end up with about 
1.95 at a 2:1 SWR.

 Here coax wins IFF the SWR remains less than 2:1 which won't happen 
over the entire commonly used portion of the band. Using ladder line 
vice coax will contain losses over the entire band. This keeps things 
simple and the cost should be a lot less.

 As to the RCA station with a 14:1 SWR, they used no balun nor tuner 
as we commonly know them today. The coupling to the final tube(s) were 
balanced and was capable of making the transformation from what the tube 
wanted and the reflected impedance at the transmitter end of the 
transmission line. Ergo, they had a very low loss if using 10 meters 
which they didn't. They typically used frequencies below 18 MHz and a 
slug of power.

Vy 73,

Barry

K3NDM


On 7/17/2020 6:57 PM, Wes wrote:
> I wrote about some of this in my paper ARRL Antenna Compendium paper 
> on ladder line 20 years ago. https://sadxa.org/n7ws/Ladder_Line.pdf
>
> I've seen pictures of those SW transmitting plants and always assumed 
> that they must have been very efficient.  Upon reflection---no pun 
> intended---now I'm not so sure.  If losses mounted up, (which they 
> most certainly did at 14:1 SWR) they had the option of just turning up 
> the wick.
>
> Furthermore, as I said in closing: "Contrary to the conventional 
> wisdom, ladder line is not a panacea for every transmission line 
> problem."  In the ensuing 20 years, I've become even more convinced of 
> this.  When tuner and balun losses are factored into this picture I 
> don't know why anyone would want to use this stuff.  I sure don't.
>
> I have a KAT500 and use it to tune some way-off resonant antennas (fed 
> with 7/8" Heliax) but I don't delude myself into thinking "I've 
> contained system losses."
>
> Wes  N7WS
> https://www.qrz.com/db/N7WS
>
>
> On 7/17/2020 2:32 PM, Barry LaZar wrote:
>> Resonance is over rated. The problem of believing you must have a 
>> resonant antenna arose with the use of coax cable began. High SWRs 
>> causes high system losses.
>>
>> Prior to the widespread use of coax, open wire was used and few 
>> antenna systems were really resonant, and nor were they reflecting a 
>> 1:1 SWR. Back then, no one cared as tubes were used and pi-net or 
>> swinging links were used to match to whatever was connected to the 
>> transmitter. In fact, I once visited a site that used rhombic 
>> antennas and Sterba curtains being fed by high power transmitters. 
>> The feed line were copper pipes about 1/4" in diameter and spaced 
>> about 4". The SWR, I was told, was 14:1. I asked if that was a 
>> problem of transferring energy to the system. The answer was no as 
>> the final output stage could match it and the system losses were low 
>> due to the type of feed line used. This was a lesson I learned 60 
>> years ago and haven't forgotten it. The site was the RCA site the 
>> once stood on Montauck Point on Long Island, New York.
>>
>> One point that keeps getting forgotten is the conservation of energy 
>> concept. What that means is energy can only be changed and not lost. 
>> Typically that means transmitter energy would be changed to heat, but 
>> 

Re: [Elecraft] Matching resonant antennas

[Barry LaZar]

Wes,

    You're correct that open wire/ladder line transmission lines are 
not a panacea. But, in the average ham stations, open wire does overcome 
high losses with high SWR, or not so high SWR. What is needed is a look 
at the ARRL Antenna book for transmission line loss/100 ft. as a 
function of SWR. You see that on 10 meters running 10:1 SWR the total 
loss is around 1 db. And, as you go to the lower bands, losses become 
less. Typical 400 Ohm ladder line has a loss of 0.2 db at 10 MHz and 0.6 
db at 100 MHz. Using these data and a little interpolation, I would use 
0.4 db on 10 meters and a 10:1 SWR for this to be 0.8 db of additional 
loss for a total of about 1.2 db. Yes, I do use a balun and recommend 
them so add another 0.5 db. Add another 0.5 db for a good tuner and we 
end up with a total of 2.2 db. on 10 meters and less on 20 and it 
decomposes to an academic exercise on 40 and down.


    Coax on 10 starts out with a higher loss/100 feet. I will use what 
I use here in K3NDM, Times LMR400. That represents 0.4 at 10 MHz. and 
1.4 db at 100 MHz. That will yield about 1.2 db/100 ft on 10 meters. Add 
0.25 db for a 2:1 SWR and 0.5 for tuner loss and you end up with about 
1.95 at a 2:1 SWR.


    Here coax wins IFF the SWR remains less than 2:1 which won't happen 
over the entire commonly used portion of the band. Using ladder line 
vice coax will contain losses over the entire band. This keeps things 
simple and the cost should be a lot less.


    As to the RCA station with a 14:1 SWR, they used no balun nor tuner 
as we commonly know them today. The coupling to the final tube(s) were 
balanced and was capable of making the transformation from what the tube 
wanted and the reflected impedance at the transmitter end of the 
transmission line. Ergo, they had a very low loss if using 10 meters 
which they didn't. They typically used frequencies below 18 MHz and a 
slug of power.


Vy 73,

Barry

K3NDM


On 7/17/2020 6:57 PM, Wes wrote:
I wrote about some of this in my paper ARRL Antenna Compendium paper 
on ladder line 20 years ago. https://sadxa.org/n7ws/Ladder_Line.pdf


I've seen pictures of those SW transmitting plants and always assumed 
that they must have been very efficient.  Upon reflection---no pun 
intended---now I'm not so sure.  If losses mounted up, (which they 
most certainly did at 14:1 SWR) they had the option of just turning up 
the wick.


Furthermore, as I said in closing: "Contrary to the conventional 
wisdom, ladder line is not a panacea for every transmission line 
problem."  In the ensuing 20 years, I've become even more convinced of 
this.  When tuner and balun losses are factored into this picture I 
don't know why anyone would want to use this stuff.  I sure don't.


I have a KAT500 and use it to tune some way-off resonant antennas (fed 
with 7/8" Heliax) but I don't delude myself into thinking "I've 
contained system losses."


Wes  N7WS
https://www.qrz.com/db/N7WS


On 7/17/2020 2:32 PM, Barry LaZar wrote:
Resonance is over rated. The problem of believing you must have a 
resonant antenna arose with the use of coax cable began. High SWRs 
causes high system losses.


Prior to the widespread use of coax, open wire was used and few 
antenna systems were really resonant, and nor were they reflecting a 
1:1 SWR. Back then, no one cared as tubes were used and pi-net or 
swinging links were used to match to whatever was connected to the 
transmitter. In fact, I once visited a site that used rhombic 
antennas and Sterba curtains being fed by high power transmitters. 
The feed line were copper pipes about 1/4" in diameter and spaced 
about 4". The SWR, I was told, was 14:1. I asked if that was a 
problem of transferring energy to the system. The answer was no as 
the final output stage could match it and the system losses were low 
due to the type of feed line used. This was a lesson I learned 60 
years ago and haven't forgotten it. The site was the RCA site the 
once stood on Montauck Point on Long Island, New York.


One point that keeps getting forgotten is the conservation of energy 
concept. What that means is energy can only be changed and not lost. 
Typically that means transmitter energy would be changed to heat, but 
not lost. What is not changed to heat on the coax will make it to the 
antenna where it MUST be radiated and not lost.  Yhe practical 
application of this is use really good coax if you can't get to a 
1:1-2:1 SWR, ot there about. Alternatively, use ladder line and a 
current balun. Elecraft tuners easily tune 10:1 SWR which contains 
system losses nicely. I have been doing this for a very long time and 
have achieved WAS, DXCC phone, DXCC CW, and DXCC digital, and, I'm 13 
short on 80 of making 5BDXCC.


73,

Barry

K3NDM


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Re: [Elecraft] Antenna tuners

[Ken Roberson via Elecraft]

 Dave - RRR - 73 Ken K5DNL

On Friday, July 17, 2020, 7:24:10 PM CDT, Dave Cole  wrote:  
 
 Tuners...  Tuners...  We don't need no stinking tuners...  Real men use 
antennas that don't need stinking tuners...

Sorry I had too...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 7/17/20 4:34 PM, Ken Roberson via Elecraft wrote:
> 
> Antenna tuners
> 
> I never use an antenna tuner , on the MF and LF bands realmen use a 
> scopematch at the
> 
> Output of the Power Amp and a matching device at the base ofthe vertical 
> antenna – HI Hi.
> 
> 73 Ken K5DNL
> 
>  
> 
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Re: [Elecraft] Antenna tuners

[Dave Cole]

Tuners...  Tuners...  We don't need no stinking tuners...  Real men use 
antennas that don't need stinking tuners...


Sorry I had too...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 7/17/20 4:34 PM, Ken Roberson via Elecraft wrote:


Antenna tuners

I never use an antenna tuner , on the MF and LF bands realmen use a scopematch 
at the

Output of the Power Amp and a matching device at the base ofthe vertical 
antenna – HI Hi.

73 Ken K5DNL

  


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Re: [Elecraft] Antenna tuners

[Ken Roberson via Elecraft]

 Kurt,
We are not tuning the antenna , we are matching the antenna to the coax at the 
base of the antenna.
73 Ken K5DNL

On Friday, July 17, 2020, 7:10:32 PM CDT, Kurt Pawlikowski 
 wrote:  
 
  
Ken: In some respects, a "matching device" at the base of the antenna is a 
tuner! {'-) It accomplishes the same function... {'-) k WB9FMC
 
 On 7/17/2020 6:34 PM, Ken Roberson via Elecraft wrote:
  
 Antenna tuners

I never use an antenna tuner , on the MF and LF bands realmen use a scopematch 
at the

Output of the Power Amp and a matching device at the base ofthe vertical 
antenna – HI Hi.

73 Ken K5DNL

 

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Re: [Elecraft] Antenna tuners

[Kurt Pawlikowski]

Ken: In some respects, a "matching device" at the base of the antenna 
_/is/_ a tuner! {'-) It accomplishes the same function... {'-) k WB9FMC


On 7/17/2020 6:34 PM, Ken Roberson via Elecraft wrote:

Antenna tuners

I never use an antenna tuner , on the MF and LF bands realmen use a scopematch 
at the

Output of the Power Amp and a matching device at the base ofthe vertical 
antenna – HI Hi.

73 Ken K5DNL

  


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[Elecraft] Antenna tuners

[Ken Roberson via Elecraft]

Antenna tuners

I never use an antenna tuner , on the MF and LF bands realmen use a scopematch 
at the

Output of the Power Amp and a matching device at the base ofthe vertical 
antenna – HI Hi.

73 Ken K5DNL

 

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Re: [Elecraft] Matching resonant antennas

[Wes]

I wrote about some of this in my paper ARRL Antenna Compendium paper on ladder 
line 20 years ago. https://sadxa.org/n7ws/Ladder_Line.pdf


I've seen pictures of those SW transmitting plants and always assumed that they 
must have been very efficient.  Upon reflection---no pun intended---now I'm not 
so sure.  If losses mounted up, (which they most certainly did at 14:1 SWR) they 
had the option of just turning up the wick.


Furthermore, as I said in closing: "Contrary to the conventional wisdom, ladder 
line is not a panacea for every transmission line problem."  In the ensuing 20 
years, I've become even more convinced of this.  When tuner and balun losses are 
factored into this picture I don't know why anyone would want to use this 
stuff.  I sure don't.


I have a KAT500 and use it to tune some way-off resonant antennas (fed with 7/8" 
Heliax) but I don't delude myself into thinking "I've contained system losses."


Wes  N7WS
https://www.qrz.com/db/N7WS


On 7/17/2020 2:32 PM, Barry LaZar wrote:
Resonance is over rated. The problem of believing you must have a resonant 
antenna arose with the use of coax cable began. High SWRs causes high system 
losses.


Prior to the widespread use of coax, open wire was used and few antenna 
systems were really resonant, and nor were they reflecting a 1:1 SWR. Back 
then, no one cared as tubes were used and pi-net or swinging links were used 
to match to whatever was connected to the transmitter. In fact, I once visited 
a site that used rhombic antennas and Sterba curtains being fed by high power 
transmitters. The feed line were copper pipes about 1/4" in diameter and 
spaced about 4". The SWR, I was told, was 14:1. I asked if that was a problem 
of transferring energy to the system. The answer was no as the final output 
stage could match it and the system losses were low due to the type of feed 
line used. This was a lesson I learned 60 years ago and haven't forgotten it. 
The site was the RCA site the once stood on Montauck Point on Long Island, New 
York.


One point that keeps getting forgotten is the conservation of energy concept. 
What that means is energy can only be changed and not lost. Typically that 
means transmitter energy would be changed to heat, but not lost. What is not 
changed to heat on the coax will make it to the antenna where it MUST be 
radiated and not lost.  Yhe practical application of this is use really good 
coax if you can't get to a 1:1-2:1 SWR, ot there about. Alternatively, use 
ladder line and a current balun. Elecraft tuners easily tune 10:1 SWR which 
contains system losses nicely. I have been doing this for a very long time and 
have achieved WAS, DXCC phone, DXCC CW, and DXCC digital, and, I'm 13 short on 
80 of making 5BDXCC.


73,

Barry

K3NDM


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[Elecraft] Convert a KXUSBa cable to KUSB

[Andy Durbin]

I don't know these cables but I would like to add a caution.   Some Elecraft 
"RS-232" interfaces are true RS-232 (voltage swings greater than +/- 8 volts) 
and others are TTL (voltage swings between 0 V and 5 V).   Be sure you know 
what you are connecting to what.   Some of the receivers are designed to accept 
either TTL or true RS-232 but perhaps not all of them are.  Driving true RS-232 
into a TTL receiver may let the smoke out.

I'd suggest reviewing the schematics before cutting and splicing.

Andy, k3wyc
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Re: [Elecraft] K-POD Coiled Cord?

[Fred Jensen]

Mine took more than a couple of turns [9 to be exact] of the supplied 
flat cable right up next to the radio connector.


73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 7/17/2020 1:43 PM, Keith Trinity WE6R wrote:

I use about a 5 foot nice flexible old computer mouse cord.
Goes from the RJ 6-pin "Radio" jack on K-POD to bottom of K3 Front Panel.
I did NOT connect a wire to the one unused pin on either end, so you 
only need 5 wires.
It works but I occasionally get RF into it on 80m as my antenna 
radiates into the house. "ERR KP1" shows in K3 display, sometimes it 
makes the frequency change.

A couple turns on a toroid  at each end did NOT help.
I suggest keep it as short as possible.
Keith WE6R Elecraft K3 Tech


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Re: [Elecraft] K-POD Coiled Cord?

[Nr4c]

TNX

Sent from my iPhone
...nr4c. bill


> On Jul 17, 2020, at 10:08 AM, Dick Dievendorff  wrote:
> 
> My K-Pod, an early one, has a rear-panel USB-B connector labeled "USB", used 
> to install K-Pod firmware and also for a K4 connection. K-Pod DC power is 
> also provided through this cable.
> 
> I use a very standard USB A to B cable.
> 
> 73 de Dick, K6KR
> 
> -Original Message-
> From: Nr4c  
> Sent: Friday, July 17, 2020 01:43
> To: Dick Dievendorff 
> Cc: Eric Norris ; elecraft@mailman qth. net 
> 
> Subject: Re: [Elecraft] K-POD Coiled Cord?
> 
> It will fit our existing K-Pods??
> 
> Sent from my iPhone
> ...nr4c. bill
> 
> 
>> On Jul 16, 2020, at 11:56 PM, Dick Dievendorff  wrote:
>> 
>> The K4 uses a USB cable to the K-Pod rather than the telephone like cable 
>> used with K3.  There are USB-A jacks on K4 front and back, not underneath 
>> like the K3.
>> 
>> 73 de Dick, K6KR
>> 
>>> On Jul 16, 2020, at 20:41, Eric Norris >> mean not the USB cord, but the telephone-cable-like cord that goes under 
>>> the right front on the K3, and I assume K4.
>>> 
>>> 73 Eric WD6DBM
>>> 
> On Thu, Jul 16, 2020, 8:00 PM Dick Dievendorff  wrote:
 It’s a standard USB-A to USB-B cable from K4 to K-Pod. I’m not sure about 
 coiled...
 
 73 de Dick, K6KR
 
> On Jul 16, 2020, at 19:50, Eric Norris  wrote:
> 
> Has anyone found a high-quality coiled cord to replace the K-POD 
> to K4 cord?  Is there a length/type restriction?
> 
> 73 Eric WD6DBM
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Re: [Elecraft] Convert a KXUSBa cable to KUSB

[Nr4c]

A DB15 is not going to connect to the DE 9 on the back of the radio.  A DB15 is 
a much larger connector. 

Also, converting the KXUSB to use on a K3 is not going to provide all the 
signals that the KUSB has.  No RTS/DTR. 

Sent from my iPhone
...nr4c. bill


> On Jul 17, 2020, at 9:29 AM, Ken Winterling  wrote:
> 
> Bill,
> 
> I haven't looked into the electronic validity of what you are asking but I
> would recommend building an adapter with a female jack and DB-15 vs cutting
> off a working connector.
> 
> Ken
> WA2LBI
> 
> 
> 
>> On Fri, Jul 17, 2020 at 9:21 AM Bill Cotter  wrote:
>> 
>> Somehow in the entropy of the universe and my cluttered shack/shop,
>> I have managed to lose my KUSB cable for my K3. I found the earlier
>> (silver) cable, but it doesn't have the FTDI chip and won't work
>> with Win-10. In the process of searching for the KUSB I have
>> managed to unearth two KXUSBa cables for my KX3.
>> 
>> Since I don't need two KXUSB cables, I am contemplating cutting off
>> the mini phone plug and wiring up a DB-15. Has anyone done this?
>> And, anyone see a downside?
>> 
>> Thanks es 73 Bill N4LG
>> 
>> 
>> 
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Re: [Elecraft] Matching resonant antennas

[Barry LaZar]

Resonance is over rated. The problem of believing you must have a 
resonant antenna arose with the use of coax cable began. High SWRs 
causes high system losses.


Prior to the widespread use of coax, open wire was used and few antenna 
systems were really resonant, and nor were they reflecting a 1:1 SWR. 
Back then, no one cared as tubes were used and pi-net or swinging links 
were used to match to whatever was connected to the transmitter. In 
fact, I once visited a site that used rhombic antennas and Sterba 
curtains being fed by high power transmitters. The feed line were copper 
pipes about 1/4" in diameter and spaced about 4". The SWR, I was told, 
was 14:1. I asked if that was a problem of transferring energy to the 
system. The answer was no as the final output stage could match it and 
the system losses were low due to the type of feed line used. This was a 
lesson I learned 60 years ago and haven't forgotten it. The site was the 
RCA site the once stood on Montauck Point on Long Island, New York.


One point that keeps getting forgotten is the conservation of energy 
concept. What that means is energy can only be changed and not lost. 
Typically that means transmitter energy would be changed to heat, but 
not lost. What is not changed to heat on the coax will make it to the 
antenna where it MUST be radiated and not lost.  Yhe practical 
application of this is use really good coax if you can't get to a 
1:1-2:1 SWR, ot there about. Alternatively, use ladder line and a 
current balun. Elecraft tuners easily tune 10:1 SWR which contains 
system losses nicely. I have been doing this for a very long time and 
have achieved WAS, DXCC phone, DXCC CW, and DXCC digital, and, I'm 13 
short on 80 of making 5BDXCC.


73,

Barry

K3NDM


On 7/17/2020 1:47 PM, Edward R Cole wrote:

Interesting discussion:

But most of us probably tune our antennas for best SWR at the desired 
frequency.


I have a dual-band 80-40m inverted-V with apex at 40-foot and 80m wire 
tail at 20-foot.  The separate 40m wire is spaced 6-inches from the 
80m wire with wooden dowels.  I found by trial-n-error that one must 
tune the lowest frequency wires, first.  I did that using an antenna 
analyzer.  Then the 40m wires.  Turns out (probably due to coupling) 
that the 40m antenna is narrow bw (50-KHz at best) whereas I get good 
SWR from 3650-4000 KHz.


The purist will say that's not resonant but the transmitter is happy.  
I can  run bypass on 3800-4000 KHz with my KXPA100/KXAT100 but must  
tune using the atu on 40m.
For working around Alaska (out to 800-miles) this "cloud burner" works 
well with 100w.  I only use SSB on these bands.  3920 is the defacto 
calling/emcomm channel in AK.


When we have an earthquake, 3920 lights up (as well as 14,292) for 
reporting from our remote areas.  I live two miles from salt-water so 
tsunami watch is common after a "big one".


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com
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[Elecraft] Waterproof SO-239 covers

[Gary Peterson]

A similar concoction is readily available in the U.S.  Depending on who 
manufactures it, the brand might be Penetrox, NoAlOx or OxGard.  It is used by 
electricians to enhance aluminum to aluminum and aluminum to copper or brass 
electrical connections.  Each of these products appears to be a mixture of a 
silicone based grease and powdered zinc metal.  I have used such, between 
sections, when assembling an aluminum antenna.  Before assembly, I apply the 
grease and use emery cloth to shine up the outer part of the inner tubing.  I 
apply the grease to a wire brush made for plumbing and use that to clean the 
inside of the outer tubing.  Aluminum is a very chemically reactive metal.  It 
quickly forms an oxide that protects the surface from further reaction.  
Unfortunately, aluminum oxide is a pretty good insulator.  By using the grease 
with the abrasion, the oxide is removed and the metal is protected from oxygen 
in the air during assembly.  I find that this procedure prevents inte
 rmittent connections and makes future disassembly much easier.  A friend had a 
multi band vertical antenna that was really flaky.  The VSWR would change with 
the wind.  We took his vertical apart and performed the antioxidant and 
abrasive treatment.  His vertical worked reliably for years afterward.  At one 
time, Mosley used to supply Penetrox with their beam antennas.  A good move in 
my opinion.  

Gary, K0CX   

I cover the threads with a
mixture of zinc and Vaseline anyway...I still use the zinc
and Vaseline on threads though because it lubricates and the zinc helps
conductivity a little, but my stock has all but gone. Steve, G4VRR
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Re: [Elecraft] Waterproof SO-239 covers

[Phil Kane]

On 7/16/2020 11:31 AM, KENT TRIMBLE wrote:
> 
> The "quarter turn" idea most often refers to the trick of backing-off a
> screw "a quarter turn" and then re-tightening in order to break up
> corrosion.  More than one restorer has brought vintage equipment to life
> by doing nothing more than that.

I apologize to all - I did mis-speak. Just a good "past snug" is about
what I meant.   And yes, a proper wrap if Rescue Tape will keep it dry -
or so my  experience has shown.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon
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[Elecraft] Fw: [OT] QST Scan

[Al Lorona]

I have the volunteer I needed to scan QST for me. Thanks, everybody.

Al W6LX




- Forwarded Message -

From: Al Lorona 
To: Elecraft Reflector 
Sent: Friday, July 17, 2020, 01:41:11 PM PDT
Subject: [Elecraft] [OT] QST Scan


This is a request for a favor... to anybody who's got a complete QST 
collection... would you be willing to scan 1 page from 1995 and send the scan 
to me? The low-res scanned copy on the QST Archive at the League's web site 
doesn't clearly show a detail that I'm interested in.

If you're able and willing to help me, please contact me off-list: 
alor...@sbcglobal.net. And thanks *very* much in advance.

Regards,

Al  W6LX

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Re: [Elecraft] K-POD Coiled Cord?

[Keith Trinity WE6R]

I use about a 5 foot nice flexible old computer mouse cord.
Goes from the RJ 6-pin "Radio" jack on K-POD to bottom of K3 Front Panel.
I did NOT connect a wire to the one unused pin on either end, so you 
only need 5 wires.
It works but I occasionally get RF into it on 80m as my antenna radiates 
into the house. "ERR KP1" shows in K3 display, sometimes it makes the 
frequency change.

A couple turns on a toroid  at each end did NOT help.
I suggest keep it as short as possible.
Keith WE6R Elecraft K3 Tech
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Re: [Elecraft] K-POD Coiled Cord?

[hawley, charles j jr]

Oh sorry. I was still thinking of usb. The aux out can control an external 
device like an antenna switch...with a macro. Page 12

Jack BMW Motorcycles
Chuck KE9UW
c-haw...@illinois.edu

Sent from my iPad

> On Jul 17, 2020, at 2:37 PM, hawley, charles j jr  
> wrote:
> 
> Computer hookup for upgrades 
> 
> Chuck Jack Hawley 
> KE9UW
> 
> Sent from my iPhone, cjack 
> 
>> On Jul 17, 2020, at 1:20 PM, Fred Jensen  wrote:
>> 
>> Just curious and a bit too busy to go look it up right now, what is the AUX 
>> jack for on the back of my K-POD?
>> 
>> 73,
>> Fred ["Skip"] K6DGW
>> Sparks NV DM09dn
>> Washoe County
>> 
 On 7/17/2020 7:08 AM, Dick Dievendorff wrote:
>>> My K-Pod, an early one, has a rear-panel USB-B connector labeled "USB", 
>>> used to install K-Pod firmware and also for a K4 connection. K-Pod DC power 
>>> is also provided through this cable.
>>> 
>>> I use a very standard USB A to B cable.
>>> 
>>> 73 de Dick, K6KR
>>> 
>> 
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Re: [Elecraft] Digital Display Unit for the Elecraft KPA500

[Keith Ennis via Elecraft]

Keith Ennis (KV5J) is proud to introduce the second in his line of Digital 
Display Units.The Digital Display Unit for Elecraft's KPA500. For the Elecraft 
KPA500 I have designed a compact, easy to read Digital Display Unit (DDU). It 
allows the monitoring of 5 crucial readings all at the same time. 1.  Power 
amplifier's heat sink temperature2.  Power amplifier's high voltage voltage3.  
Power amplifier's current4.  Power amplifier's output power5. SWR that the 
KPA500 sees at its output The DDU measures is size only 4x4x2 inches with an 
easy to read 2 line display that can be located at the operating position and 
the KPA500 can be located over 10 feet away. The DDU is designed with the 
following features: Easy to read 2 line displayNo USB or serial cable to 
computerNo com port in Windows to manageNo computer neededPlug and PlaySimply 
connect the supplied DC power cable to the power supply and the supplied data 
jumper cable to the KPA500Retains all functions of the KPA500 front panelAll 
displayed info obtained directly from the KPA500 The DDU will poll the KPA500 
and display PA voltage and PA temperature during both receive and transmit 
cycles.  It will add watts and SWR display for a short amount of time after 
unkeying the amp. For more information about the obtaining the DDU visit:   
http://WWW.KV5J.COM 




Keith, KV5J


Keith
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[Elecraft] [OT] QST Scan

[Al Lorona]

This is a request for a favor... to anybody who's got a complete QST 
collection... would you be willing to scan 1 page from 1995 and send the scan 
to me? The low-res scanned copy on the QST Archive at the League's web site 
doesn't clearly show a detail that I'm interested in.

If you're able and willing to help me, please contact me off-list: 
alor...@sbcglobal.net. And thanks *very* much in advance.

Regards,

Al  W6LX

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Re: [Elecraft] Using Yaesu Quadra VL-1000 with K3/ ALC?

[Jim Brown]

On 7/17/2020 6:35 AM, Charlie T wrote:

ust to make this plain, do NOT run your 100/200 watt radio at max output
and depend on the ALC connection to cut it back.


Right! Using ALC between power amp and rig to set TX power is a recipe 
for massive splatter and clicks.


73, Jim K9YC
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Re: [Elecraft] K-POD Coiled Cord?

[hawley, charles j jr]

Computer hookup for upgrades 

Chuck Jack Hawley 
KE9UW

Sent from my iPhone, cjack 

> On Jul 17, 2020, at 1:20 PM, Fred Jensen  wrote:
> 
> Just curious and a bit too busy to go look it up right now, what is the AUX 
> jack for on the back of my K-POD?
> 
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
> 
>> On 7/17/2020 7:08 AM, Dick Dievendorff wrote:
>> My K-Pod, an early one, has a rear-panel USB-B connector labeled "USB", used 
>> to install K-Pod firmware and also for a K4 connection. K-Pod DC power is 
>> also provided through this cable.
>> 
>> I use a very standard USB A to B cable.
>> 
>> 73 de Dick, K6KR
>> 
> 
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Re: [Elecraft] K4 in production

[Dave New, N8SBE]

Thanks, Rich.  "All industries are equal, but some are more equal than
others."


I'm amazed at the folks that seem to think that ham radio equipment is
even on the radar of anybody's 'essential' industry.


What's even weirder, is that if you ask anyone to make up a list of
'essential' industries, it would look like no one else's list, ever.


It seems that the industries that have the deepest pockets and the most
to lose (all at the same time, it seems) are the only ones getting
parts.  All the small players are going begging.


The major automotive OEMs (billions of dollars/yr in sales) have been
back in production now for several weeks.  Consider that the average
vehicle these days has over 30K parts, and then try to figure out why
small businesses like Elecraft can't get the parts they need to go back
into production.


It's not that the parts aren't available, it's that the parts went
SOMEWHERE ELSE.


Even the automotive OEM's have occasionally had to take a back seat to
other manufacturers when it comes to electronics, especially the
computer and cell phone guys.  In the race to source microprocessor
parts, there is a definite pecking order, based on volume and pricing
and demand.  If you sell a billion cell phones a year, guess who gets
first pick?


Sorry to bust everyone's bubble, but ham radio is really not that
important, in the great industry wheel of things.


73,


-- Dave, N8SBE
   Original Message 
 Subject: Re: [Elecraft] K4 in production
 From: Rich NE1EE <73.de.ne...@gmail.com>
 Date: Fri, July 17, 2020 8:04 am
 To: elecraft@mailman.qth.net

 I'm sure that it varies by location and industry. I have spoken to
several businesses who report they are behind due to supply chain
interruptions and delays.

 I see that I need to change my habits for this mailer...I have a habit
of hitting reply, and twice now I have sent private messages when I
meant to reply to the group...

 ~R~
 72/73 de Rich NE1EE
 On the banks of the Piscataqua
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Re: [Elecraft] K-POD Coiled Cord?

[Fred Jensen]

Just curious and a bit too busy to go look it up right now, what is the 
AUX jack for on the back of my K-POD?


73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 7/17/2020 7:08 AM, Dick Dievendorff wrote:

My K-Pod, an early one, has a rear-panel USB-B connector labeled "USB", used to 
install K-Pod firmware and also for a K4 connection. K-Pod DC power is also provided 
through this cable.

I use a very standard USB A to B cable.

73 de Dick, K6KR



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Re: [Elecraft] Matching resonant antennas

[Edward R Cole]

Interesting discussion:

But most of us probably tune our antennas for best SWR at the desired 
frequency.


I have a dual-band 80-40m inverted-V with apex at 40-foot and 80m 
wire tail at 20-foot.  The separate 40m wire is spaced 6-inches from 
the 80m wire with wooden dowels.  I found by trial-n-error that one 
must tune the lowest frequency wires, first.  I did that using an 
antenna analyzer.  Then the 40m wires.  Turns out (probably due to 
coupling) that the 40m antenna is narrow bw (50-KHz at best) whereas 
I get good SWR from 3650-4000 KHz.


The purist will say that's not resonant but the transmitter is 
happy.  I can  run bypass on 3800-4000 KHz with my KXPA100/KXAT100 
but must  tune using the atu on 40m.
For working around Alaska (out to 800-miles) this "cloud burner" 
works well with 100w.  I only use SSB on these bands.  3920 is the 
defacto calling/emcomm channel in AK.


When we have an earthquake, 3920 lights up (as well as 14,292) for 
reporting from our remote areas.  I live two miles from salt-water so 
tsunami watch is common after a "big one".


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


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Re: [Elecraft] Joke status wasn't wasted on me 

[marvwheeler]

Geez! Where's the courtesy?

Marv
KG7V

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of JP Douglas
Sent: Friday, July 17, 2020 10:09 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Joke status wasn't wasted on me 

What does this have to do with Elecraft???

Please do not waste my time!

Thanks!

Jose Douglas KB1TCD

On 7/16/2020 7:12 PM, Rose wrote:
> On Thu, Jul 16, 2020, 16:59 Fred Jensen  wrote:
>
>> Yes, I too have a math degree and the mean population density of 
>> California is ~98/sq km and yes, all the people in CA could stand 
>> well more than 1 m apart and no one would need scuba tanks or find 
>> themselves in Nevada [or Oregon or Arizona or Baja California].  I made it 
>> up ...
>> it was intended as a joke.  It's a good thing I ended up supporting 
>> my family with math and engineering degrees since I don't hold a 
>> degree in comedy and apparently  I suck at it. [:=)
>>
>> 73,
>> Fred ["Skip"] K6DGW
>> Sparks NV DM09dn
>> Washoe County
>>
>> On 7/16/2020 3:14 PM, Joseph Shuman via Elecraft wrote:
>>> Not waiting on a K4, got my KX2 and perfectly happy.  Also, off 
>>> topic
>> and not intended to besmirch anyone, but being a math geek in a math 
>> geeky hobby . . .
>>> “The population density in California is high ... high enough that 
>>> if
>> everyone stood 1 meter from everyone else, some would be standing in 
>> Nevada and some in the Pacific Ocean.”
>>> Check your math.  World population is about 8 Billion.  Give 
>>> everyone a
>> Covid distance of two meters, or four square meters per person.  That 
>> gives us 32 billion square meters to socially distance the world population.
>> California is about 424 billion square meters.  Plenty of room for 
>> everybody!
>>> Keeping Watch-
>>> shu
>>>
>>> Joe Shuman, KE8KJZ
>>>
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delivered to marvwhee...@nwlink.com 

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Re: [Elecraft] Joke status wasn't wasted on me 

[JP Douglas]

What does this have to do with Elecraft???

Please do not waste my time!

Thanks!

Jose Douglas KB1TCD

On 7/16/2020 7:12 PM, Rose wrote:

On Thu, Jul 16, 2020, 16:59 Fred Jensen  wrote:


Yes, I too have a math degree and the mean population density of
California is ~98/sq km and yes, all the people in CA could stand well
more than 1 m apart and no one would need scuba tanks or find themselves
in Nevada [or Oregon or Arizona or Baja California].  I made it up ...
it was intended as a joke.  It's a good thing I ended up supporting my
family with math and engineering degrees since I don't hold a degree in
comedy and apparently  I suck at it. [:=)

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 7/16/2020 3:14 PM, Joseph Shuman via Elecraft wrote:

Not waiting on a K4, got my KX2 and perfectly happy.  Also, off topic

and not intended to besmirch anyone, but being a math geek in a math geeky
hobby . . .

“The population density in California is high ... high enough that if

everyone stood 1 meter from everyone else, some would be standing in Nevada
and some in the Pacific Ocean.”

Check your math.  World population is about 8 Billion.  Give everyone a

Covid distance of two meters, or four square meters per person.  That gives
us 32 billion square meters to socially distance the world population.
California is about 424 billion square meters.  Plenty of room for
everybody!

Keeping Watch-
shu

Joe Shuman, KE8KJZ


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Re: [Elecraft] Using Yaesu Quadra VL-1000 with K3/ ALC?

[Charlie T]

I always felt that the ALC control into an SS amp is the amp's last resort
to being over-driven (= damaged?).
Yes, for normal operation, set your radio at a lower power to drive the amp
to the desired level, which does NOT activate the ALC.
However, if you do something "un-smart", the ALC will hopefully protect the
amp's input.

Just to make this plain, do NOT run your 100/200 watt radio at max output
and depend on the ALC connection to cut it back.

73, Charlie k3ICH



 

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Re: [Elecraft] Way OT: Bird APM-16 for sale

[Lyn Norstad]

Here's a link:

https://birdrf.com/en/Products/Test%20and%20Measurement/RF-Power-Meters/Watt
meters-Line-Sections/RF-Wattmeters/APM-16_Average-Reading-Power-Meter.aspx?g
clid=CjwKCAjwmMX4BRAAEiwA-zM4JtuO8sbzCsjg_4apIkPk8IlF48EXdqyoJq9us9FipBHUCqY
DySso8xoCU3cQAvD_BwE


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyn Norstad
Sent: Friday, July 17, 2020 9:51 AM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Way OT: Bird APM-16 for sale

I have an immaculate Bird APM-16 Average Reading RF Power Meter with several
elements and carrying case, which I no longer (and hardly ever did .) need.

 

If interested, PM me.

 

73

Lyn, W0LEN

 

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[Elecraft] KIO3B - different audio levels?

[Udo Langenohl - DK5YA]

I've upgraded both of my K3 while ago with all parts available to make 
them K3S (more or less).


My main K3 shows some weird behavior with the audio level comparing left 
and right stereo channel (KIO3B). I'm feeding this K3 mainly with 144 
transverter signals from XPol yagis (moonbounce system) with the Hpol 
signals on the main RX and Vpol signals at the second RX (AUX). Main RX 
is left channel on the USB soundcard while SUB RX is the right channel 
(Windows 10, MIC input).


Even when on both RX (main and sub) the HF signal level is exactly the 
same (i.e. -120dBm from a HP8664A signal generator, split by 3-dB for 
main and sub) the left audio channel (main RX) shows exactly 6dB less 
compared to the right audio channel (sub RX) at USB audio out. On the 
IF-side (28 MHz) signal strength is exactly the same level, measured 
with my Siglent Spec Analyzer. Just .34dB difference main/sub.


This doesn't happen on my 2nd K3 which is almost exactly the same inside 
like #1 except it's a 10W version.


Any idea?

Udo, DK5YA
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[Elecraft] Way OT: Bird APM-16 for sale

[Lyn Norstad]

I have an immaculate Bird APM-16 Average Reading RF Power Meter with several
elements and carrying case, which I no longer (and hardly ever did .) need.

 

If interested, PM me.

 

73

Lyn, W0LEN

 

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Re: [Elecraft] Matching resonant antennas

[Wes]

If you want to pick nits then even a "perfect" dummy load doesn't match a 
practical transmission line which has loss, hence has a reactive characteristic 
impedance. :-)


Wes  N7WS


On 7/16/2020 3:32 PM, donov...@starpower.net wrote:

Ken's statement that " a non-resonant antenna can have a 1:1 SWR"
is patently false with the sole exception of a dummy load used as an
antenna.


73
Frank
W3LPL



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Re: [Elecraft] K-POD Coiled Cord?

[Dick Dievendorff]

Yes, an RJ-12 cable for a K3, a USB cable for a K4. 

 

73 de Dick, K6KR

 

From: hawley, charles j jr  
Sent: Friday, July 17, 2020 07:23
To: Dick Dievendorff ; Eric Norris 
Cc: elecraft@mailman qth. net 
Subject: Re: [Elecraft] K-POD Coiled Cord?

 

Oh...not the same as the K3 6 pin connectors?

 

Chuck Hawley
 c-haw...@illinois.edu  
  
 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles  

 

  _  

From: elecraft-boun...@mailman.qth.net 
  mailto:elecraft-boun...@mailman.qth.net> > on behalf of Dick Dievendorff 
mailto:d...@elecraft.com> >
Sent: Thursday, July 16, 2020 10:00 PM
To: Eric Norris mailto:norrislawfi...@gmail.com> >
Cc: elecraft@mailman qth. net mailto:elecraft@mailman.qth.net> >
Subject: Re: [Elecraft] K-POD Coiled Cord? 

 

It’s a standard USB-A to USB-B cable from K4 to K-Pod. I’m not sure about 
coiled...

73 de Dick, K6KR

> On Jul 16, 2020, at 19:50, Eric Norris   > wrote:
> 
> Has anyone found a high-quality coiled cord to replace the K-POD to K4
> cord?  Is there a length/type restriction?
> 
> 73 Eric WD6DBM
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Re: [Elecraft] K-POD Coiled Cord?

[hawley, charles j jr]

Oh...not the same as the K3 6 pin connectors?

Chuck Hawley
 c-haw...@illinois.edu

 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles


From: elecraft-boun...@mailman.qth.net  on 
behalf of Dick Dievendorff 
Sent: Thursday, July 16, 2020 10:00 PM
To: Eric Norris 
Cc: elecraft@mailman qth. net 
Subject: Re: [Elecraft] K-POD Coiled Cord?

It’s a standard USB-A to USB-B cable from K4 to K-Pod. I’m not sure about 
coiled...

73 de Dick, K6KR

> On Jul 16, 2020, at 19:50, Eric Norris  wrote:
>
> Has anyone found a high-quality coiled cord to replace the K-POD to K4
> cord?  Is there a length/type restriction?
>
> 73 Eric WD6DBM
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Re: [Elecraft] K-POD Coiled Cord?

[Dick Dievendorff]

My K-Pod, an early one, has a rear-panel USB-B connector labeled "USB", used to 
install K-Pod firmware and also for a K4 connection. K-Pod DC power is also 
provided through this cable.

I use a very standard USB A to B cable.

73 de Dick, K6KR

-Original Message-
From: Nr4c  
Sent: Friday, July 17, 2020 01:43
To: Dick Dievendorff 
Cc: Eric Norris ; elecraft@mailman qth. net 

Subject: Re: [Elecraft] K-POD Coiled Cord?

It will fit our existing K-Pods??

Sent from my iPhone
...nr4c. bill


> On Jul 16, 2020, at 11:56 PM, Dick Dievendorff  wrote:
> 
> The K4 uses a USB cable to the K-Pod rather than the telephone like cable 
> used with K3.  There are USB-A jacks on K4 front and back, not underneath 
> like the K3.
> 
> 73 de Dick, K6KR
> 
>> On Jul 16, 2020, at 20:41, Eric Norris > mean not the USB cord, but the telephone-cable-like cord that goes under the 
>> right front on the K3, and I assume K4.
>> 
>> 73 Eric WD6DBM
>> 
 On Thu, Jul 16, 2020, 8:00 PM Dick Dievendorff  wrote:
>>> It’s a standard USB-A to USB-B cable from K4 to K-Pod. I’m not sure about 
>>> coiled...
>>> 
>>> 73 de Dick, K6KR
>>> 
 On Jul 16, 2020, at 19:50, Eric Norris  wrote:
 
 Has anyone found a high-quality coiled cord to replace the K-POD 
 to K4 cord?  Is there a length/type restriction?
 
 73 Eric WD6DBM
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Re: [Elecraft] Convert a KXUSBa cable to KUSB

[Bill Steffey NY9H]

db 15  or db9 ( DE9)


On 7/17/2020 9:20 AM, Bill Cotter wrote:
Somehow in the entropy of the universe and my cluttered shack/shop, I 
have managed to lose my KUSB cable for my K3. I found the earlier 
(silver) cable, but it doesn't have the FTDI chip and won't work with 
Win-10. In the process of searching for the KUSB I have managed to 
unearth two KXUSBa cables for my KX3.


Since I don't need two KXUSB cables, I am contemplating cutting off 
the mini phone plug and wiring up a DB-15. Has anyone done this? And, 
anyone see a downside?


Thanks es 73 Bill N4LG

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Re: [Elecraft] Convert a KXUSBa cable to KUSB

[Bill Steffey NY9H]

heck    for 13 $ you can get another  usb rs232 ftdi cord


Sabrent USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable 
[FTDI Chipset] (CB-FTDI)




   Sabrent USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft
   Cable [FTDI Chipset] (CB-FTDI)
   


/4.6 out of 5 stars/322 


$12.21$12.21
FREE DeliveryWed, Jul 22



On 7/17/2020 9:20 AM, Bill Cotter wrote:
Somehow in the entropy of the universe and my cluttered shack/shop, I 
have managed to lose my KUSB cable for my K3. I found the earlier 
(silver) cable, but it doesn't have the FTDI chip and won't work with 
Win-10. In the process of searching for the KUSB I have managed to 
unearth two KXUSBa cables for my KX3.


Since I don't need two KXUSB cables, I am contemplating cutting off 
the mini phone plug and wiring up a DB-15. Has anyone done this? And, 
anyone see a downside?


Thanks es 73 Bill N4LG

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[Elecraft] CWT Calibration

[Wilson Lamb]

Not an operating question.
Didn't use a counter...was actually trying an old BC-221 frequency meter and 
wanted a quick indicator of drift.
I made my estimate using the Pitch setting...changing pitch and retuning.
Also moved signal and retuned to return CWT to middle, then read freq increment 
from display.
WL
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Re: [Elecraft] Using Yaesu Quadra VL-1000 with K3/ ALC?

[Joe Subich, W4TV]

*IF* the user can remember to turn the exciter power level down before
turning on the amplifier, ALC is not necessary.  However, it remains the
only failsafe way to prevent damage to the amplifier from sustained
overdrive. Given the cost of replacing transistors in the amplifiers,
I would certainly implement ALC with any amplifier (unless, of course,
it could automatically set exciter power level as the KPA500 or KPA1500
with the K3/K3S).

73,

   ... Joe, W4TV


On 2020-07-17 8:59 AM, j...@kk9a.com wrote:
Every amp that I use I would overdrive with the Elecraft set at 100 
watts. I am not familiar with the Quadra, I typically adjust the PWR 
(power output) control to the desired wattage and have not had an issue 
with any that that I have used. I see a lot of talk about using ALC on 
the SPE Expert amp list. I have not used this brand and do not why ALC 
appears to be recommend for them.  I have not connected an ALC cable in 
decades.


John KK9A


Joe Subich, W4TV wrote:

  > Is it necessary?

Yes.  The Quadra produces is rated 1000 W output with approximately
60W drive.  The K3 will overdrive it resulting in splatter/IMD and
potential damage to the transistors.

73,

     ... Joe, W4TV


On 2020-07-16 7:25 PM, Dean L wrote:

I'm working on a Yaesu VL1000 for a friend and wondering if anybody's had
experience setting up ALC with the K3 and the VL1000?
Is it necessary?
I'm not much of a QRO guy as you can probably tell.

Thanks in advance for your help 73

Dean K2WW




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Re: [Elecraft] Convert a KXUSBa cable to KUSB

[Ken Winterling]

Bill,

I haven't looked into the electronic validity of what you are asking but I
would recommend building an adapter with a female jack and DB-15 vs cutting
off a working connector.

Ken
WA2LBI



On Fri, Jul 17, 2020 at 9:21 AM Bill Cotter  wrote:

> Somehow in the entropy of the universe and my cluttered shack/shop,
> I have managed to lose my KUSB cable for my K3. I found the earlier
> (silver) cable, but it doesn't have the FTDI chip and won't work
> with Win-10. In the process of searching for the KUSB I have
> managed to unearth two KXUSBa cables for my KX3.
>
> Since I don't need two KXUSB cables, I am contemplating cutting off
> the mini phone plug and wiring up a DB-15. Has anyone done this?
> And, anyone see a downside?
>
> Thanks es 73 Bill N4LG
>
>
>
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[Elecraft] Convert a KXUSBa cable to KUSB

[Bill Cotter]

Somehow in the entropy of the universe and my cluttered shack/shop, 
I have managed to lose my KUSB cable for my K3. I found the earlier 
(silver) cable, but it doesn't have the FTDI chip and won't work 
with Win-10. In the process of searching for the KUSB I have 
managed to unearth two KXUSBa cables for my KX3.


Since I don't need two KXUSB cables, I am contemplating cutting off 
the mini phone plug and wiring up a DB-15. Has anyone done this? 
And, anyone see a downside?


Thanks es 73 Bill N4LG

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Re: [Elecraft] Using Yaesu Quadra VL-1000 with K3/ ALC?

[john]

Every amp that I use I would overdrive with the Elecraft set at 100  
watts. I am not familiar with the Quadra, I typically adjust the PWR  
(power output) control to the desired wattage and have not had an  
issue with any that that I have used. I see a lot of talk about using  
ALC on the SPE Expert amp list. I have not used this brand and do not  
why ALC appears to be recommend for them.  I have not connected an ALC  
cable in decades.


John KK9A


Joe Subich, W4TV wrote:

 > Is it necessary?

Yes.  The Quadra produces is rated 1000 W output with approximately
60W drive.  The K3 will overdrive it resulting in splatter/IMD and
potential damage to the transistors.

73,

... Joe, W4TV


On 2020-07-16 7:25 PM, Dean L wrote:

I'm working on a Yaesu VL1000 for a friend and wondering if anybody's had
experience setting up ALC with the K3 and the VL1000?
Is it necessary?
I'm not much of a QRO guy as you can probably tell.

Thanks in advance for your help 73

Dean K2WW


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Re: [Elecraft] K4 in production

[Rich NE1EE]

I'm sure that it varies by location and industry. I have spoken to several 
businesses who report they are behind due to supply chain interruptions and 
delays.

I see that I need to change my habits for this mailer...I have a habit of 
hitting reply, and twice now I have sent private messages when I meant to reply 
to the group...

~R~
72/73 de Rich NE1EE
On the banks of the Piscataqua


On 2020-07-16 20:01:-0700, Jim Brown wrote:
>On 7/16/2020 3:14 PM, Joseph Shuman via Elecraft wrote:
>>Check your math.  World population is about 8 Billion.  Give everyone a Covid 
>>distance of two meters, or four square meters per person.  That gives us 32 
>>billion square meters to socially distance the world population.  California 
>>is about 424 billion square meters.  Plenty of room for everybody!
>
>Check your geography. Not all parts of the world (or of California) are 
>habitable!
>
>73, Jim K9YC

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[Elecraft] K2 Brilliant Help

[Robert Calver via Elecraft]

Guys
Just wanted to say how much I appreciated the help of Don after I killed the PA 
and bias transistors on my K2 recently. 
Unexpected, but Elecraft (Don in this case) was right on the case with years of 
experience on tap, a real guy, not some software query guessing service - don’t 
you love em!
 From here in the UK it’s hard to find companies that give a damn once they 
have your money!
Reading about how Covid is hitting the supply and delivery of good old 
Elecraft, though frustrating if you’re in a queue ( which I’m not) at least 
they seem to genuinely have the customers back.
So stay safe guys, keep cool and do all those jobs your other half has on 
his/her list. When the kit arrives you will have weeks of “brownie points” 
stored up which equal zero guilt radio operation.
73
Bob
G4JGX



Sent from my iPhone
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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[CUTTER DAVID via Elecraft]

Skip

Was any attempt made to redress the imbalance?

David G3UNA

> On 17 July 2020 at 03:19 Fred Jensen  mailto:k6...@foothill.net > wrote:
> 
> 
> They were around somewhat before the patent in several forms, and they
> were around in 1960, which is the last time I looked hence my estimate
> of 60 years.  Lots of other "balanced" antennas fed with open line were
> also in use commercially during that rough period, they too exhibited
> the same characteristic ... while carefully engineered to be balanced,
> RF currents in the two wires never were exactly balanced, which was the
> original and only point.
> 
> I still have an RF ammeter in my junk box, from some airborne WW2 radio
> I think.  It's probably an antique by now.
> 
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
> 
> On 7/16/2020 5:47 PM, donov...@starpower.net 
> mailto:donov...@starpower.net wrote:
> 
> > > Hi Skip,
> > 
> > Conceptionally you're correct about rhombics and V-beams but your 
> > time
> > frame is way off.
> > 
> > Edmond Bruce's rhombic antenna patent was filed in 1931.
> > 
> > www.aktuellum.com/mobile/circuits/antenna-patent
> > 
> > 
> > ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1685103
> > 
> > 
> > The heyday for the rhombic ran from the 1930s through the 1970s with
> > the advent of satellite communications.  The 200 foot tower for my
> > 40 meter stacked 3 element Yagis came from a decommissioned
> > Laport Rhombic installed at the NSS receive site in Cheltenham MD.
> > We removed it in 1985, but it hadn't been used for years.
> > 
> > 73
> > Frank
> > W3
> > 
> > > __
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Re: [Elecraft] Waterproof SO-239 covers

[Steve Gray]

I use "Plasticene" (maybe known as modelling clay?)
In my experience it never hardens, it is waterproof and easy to remove. I
used to use the orange tapered vinyl boots that were used on mineral
insulated "Pyro" cable over the top since they are a great seal over PL259s
but I have used up my stock. I make sure that the cable is not free to flap
around and "Plasticene" does the job.

If there's only two "teeth" on the PL259 connector then I frequently file
them off and ignore the slight plating loss. I cover the threads with a
mixture of zinc and Vaseline anyway. This is a concoction that we used to
use at work (in a loosely aerospace related company) to facilitate riveted
ground points on galley structures prior to Meggar tests, but that process
fell into disuse. It came about because the guys were using heatsink
compound until I arrived and pointed out their error!  I still use the zinc
and Vaseline on threads though because it lubricates and the zinc helps
conductivity a little, but my stock has all but gone.

Steve, G4VRR.



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Re: [Elecraft] K-POD Coiled Cord?

[Nr4c]

It will fit our existing K-Pods??

Sent from my iPhone
...nr4c. bill


> On Jul 16, 2020, at 11:56 PM, Dick Dievendorff  wrote:
> 
> The K4 uses a USB cable to the K-Pod rather than the telephone like cable 
> used with K3.  There are USB-A jacks on K4 front and back, not underneath 
> like the K3.
> 
> 73 de Dick, K6KR
> 
>> On Jul 16, 2020, at 20:41, Eric Norris > 
>> Sorry, I mean not the USB cord, but the telephone-cable-like cord that goes 
>> under the right front on the K3, and I assume K4.
>> 
>> 73 Eric WD6DBM
>> 
 On Thu, Jul 16, 2020, 8:00 PM Dick Dievendorff  wrote:
>>> It’s a standard USB-A to USB-B cable from K4 to K-Pod. I’m not sure about 
>>> coiled...
>>> 
>>> 73 de Dick, K6KR
>>> 
 On Jul 16, 2020, at 19:50, Eric Norris  wrote:
 
 Has anyone found a high-quality coiled cord to replace the K-POD to K4
 cord?  Is there a length/type restriction?
 
 73 Eric WD6DBM
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Re: [Elecraft] Using Yaesu Quadra VL-1000 with K3/ ALC?

[Victor Rosenthal 4X6GP]

ALC is not needed if you set the K3 to 60w (or whatever the appropriate 
drive is for each band) using the K3's per-band option.


Using ALC to control the drive will also introduce distortion.

The only disadvantage of the per-band power setting is that if you want 
to run more than 60w when you operate barefoot, you have to remember to 
turn it back down when you want to use the amp. This is automatic with 
the KPA500 and 1500, but not with a non-Elecraft amp.


I once created a macro which would set the power and activate one of the 
K3's digital outputs, which I used to control a relay that switched an 
amp in line. That worked. But now I just run 60 or 70w when I'm 
barefoot. There isn't that much difference from the full 100w.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
.
On 17/07/2020 3:48, Joe Subich, W4TV wrote:



Is it necessary?


Yes.  The Quadra produces is rated 1000 W output with approximately 
60W drive.  The K3 will overdrive it resulting in splatter/IMD and 
potential damage to the transistors.


73,

... Joe, W4TV


On 2020-07-16 7:25 PM, Dean L wrote:

I'm working on a Yaesu VL1000 for a friend and wondering if
anybody's had experience setting up ALC with the K3 and the
VL1000? Is it necessary? I'm not much of a QRO guy as you can
probably tell.

Thanks in advance for your help 73

Dean K2WW



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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[Victor Rosenthal 4X6GP]

I took great care in the construction of my rotary dipole and feed 
system to make it as balanced as possible. I made a clamp-on device from 
a split ferrite bead that I can use to measure the relative currents in 
the open line conductors, and they are very close.


There is one direction in which there is measurable unbalance due to a 
nearby object, but unfortunately this is also the direction of my major 
source of noise, another building 100m away, so it's not possible to 
tell whether the unbalance contributes to the noise or not.


Someone else said that balanced lines don't reject common mode noise. 
It's true that common mode noise currents can flow on the feedline, but 
they are rejected by the balanced link-coupled tuner at the transmitter end.


I unfortunately don't have a choked coax-fed dipole to compare it to, 
but it is much quieter than the previous antenna, a coax-fed multiband 
vertical. And it is also a far better transmitting antenna.


Let's hear it for 1930s technology!

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
.
On 17/07/2020 0:41, Fred Jensen wrote:

Indeed!  Probably the least unbalanced of "balanced" antenna systems
 that ever existed were the HF point-to-point rhombics and V-beams at
the RCA, Mackay, and Marconi shore stations in the first 60 or so
years of the 20th century.  Despite very precise engineering to make
them balanced, the RF currents in each side of the open feeders were
never exactly the same.

As a teenage ham, I tended to think in absolutes and exactitudes. If
my Heath MM-1 multimeter said the screen voltage was 176.5 V, I
believed it was, exactly, and if the spec said 177.5 V, I needed to
do something to "fix" it.  If the ARRL Handbook said the two halves
of my 40 meter dipole needed to be exactly 32.9114 feet, I believed
that the antenna would not work if I didn't assure my dipole was
exactly 32.9114 on each side.  As I grew older, both in age and ham
longevity, I realized my Elmer was right when reminded me on multiple
occasions, "We're amateurs.  Most often, 'close' is good enough."

Seems like many today are convinced that 32.9114 ft will work but 
32.9000 ft won't.


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

On 7/16/2020 1:00 PM, Jim Brown wrote:

On 7/16/2020 1:14 AM, Victor Rosenthal 4X6GP wrote:

If the antenna is well-balanced and fed via a true balanced
antenna tuner (preferably link-coupled) then there shouldn't be a
problem with common mode currents.


Few ham antennas are perfectly balanced -- they are often
unbalanced by their surroundings. For example, ground slope,
unequal heights of the two halves, other conductors around the
antenna, even vegetation. And yes, all elements of the antenna
system, including the feedline, the antenna, and matching at both
ends, contribute to the balance of the SYSTEM.

THAT'S why it's wrong to talk about "balanced line," using
"parallel wire" or 2-wire" line instead.

73, Jim K9YC


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