[Elecraft] Elecraft CW Net Report

[kevin]

Good Evening,

   Conditions were a bit better on forty meters.  There was deeper QSB 
but signals were stronger.  I was surprised at how cool the temperatures 
were around the country.  Then I got to Dale who said 105 F was cooler 
than the days preceding.  Hopefully his A/C keeps working.


   The solar stream is close.  Maybe that will boost conditions during 
the week.  There are a few sunspot groups moving into position.  One of 
them is shooting B class flares.  The sun is waking up.



  On 14050.7 kHz at 2200z:

K6XK - Roy - IA

K0DTJ - Brian - CA


  On 7047.5 kHz at z:

K0DTJ - Brian - CA

WM5F - Dwight  - ID

K6PJV - Dale - CA

W0CZ - Ken - ND

W7LKG - Rick - WA


   Until next week 73,

  Kevin.  KD5ONS


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Those who are able to see beyond the shadows and lies of their culture 
will never be understood,

let alone believed by the masses.  ~ Plato

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Re: [Elecraft] KAT500 ANT1 problem

[Jim Brown]

On 7/11/2021 1:52 PM, Dave wrote:

What had apparently happened was that I had a batch of the offshore made
"Amazon Special" PL-259s that appear to have a slightly oversize center 
pin.


For several decades, I've served on the Standards Committee of the Audio 
Engineering Society with representatives of the two best mfrs of audio 
connectors -- Switchcraft and Neutrik. Both report having had problems 
with counterfeits of their parts, and that out of tolerance pretty 
common. Some major mic mfrs, both US and EU, have reported 
counterfeiting of their products.


Years ago, I learned that cheap, no-brand connectors are a very 
expensive mistake. When I got back on the air in 2003, I stocked up with 
several dozen adapters that, over the next ten years caused me no end of 
grief.


In North America, if a UHF, BNC, or type-N connector isn't branded 
Belden or stamped with a MIL part number, it's junk.


73, Jim K9YC






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[Elecraft] Frequency Tracking Revisited

[Andy Durbin]

"As I now understand Frequency Tracking, it works like this:

1. Once the KAT500 is "trained," the frequency segments attributed to each band 
are places where the KAT500 will look for good SWR matches. In other words, if 
I happen to have the VFO set on a frequency that is in Segment 5 (my label, 
just for clarity), the tuner will for for good matches in Segment 5 — correct? 

2. If no good matches are found in Segment 5, the KAT500 will do a Full Tune to 
create one — correct?

3. It seems to me that "Training the Tuner" is truly a convenience exercise: 
populating segments in the band so the tuner will find a good match and not 
have to do a Full Tune — correct?

4. Rather than setting just low, middle, and high tuning solutions on 20 meter 
SSB, for example, I set a solution in each of the 11 segments, thinking that no 
matter where I tune in 20 meter SSB, the KAT500 will find a good solution. — 
correct?"

1 - Each tuner bin has a finite width.  The match at the upper end, middle, and 
lower end of each bin may be different.  How different depends on the 
characteristics of the antenna.

2.  Only if the tuner is in AUTO mode.  Many seem to recommend training for the 
band and then using MAN mode.  That is how I use my KAT500.  

3.  If you train the tuner then you are finding and saving a match for each bin 
at your convenience.  This is better than having the tuner un-key the amplifier 
and try to find a match while you are attempting a QSO.

4.  Populating all bins in a band with good solutions is, in my opinion, the 
best way to use the KAT500 but it is still no guarantee that it will give a 
good match on every frequency (see 1 above).

73,
Andy, k3wyc

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Re: [Elecraft] KAT500 ANT1 problem

[Andy Durbin]

"The secondary toroid of the directional coupler has a direct path to ground. 
That means there is no straight-through DC path."

I may have misunderstood the schematics.  What I see is a DC path between J1 
input and "ATU".  If K20, K21 and K18 are all in the NC state there will be a 
low impedance DC path between "ATU" and ANT-1.  If any of these relays is 
faulty and not closed the DC path will be open.  Sure, there is a DC path 
between J1 and ground through the coupler but I don't see how that changes the 
path to ANT-1.

If ANT-1 is open circuit to XMTR isn't it likely that K18, K21, or K20 is 
faulty?

I realize this is now just a mental challenge as the OP's problem has already 
been solved.

73,
Andy, k3wyc


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Re: [Elecraft] Frequency Tracking Revisited

[Jack Brindle via Elecraft]

Richard;

There is good reason to train the KAT500, especially if you use SSB. First, you 
need to always tune the KAT500 with CW. The K3’s TUNE function takes care of 
this quite well. Simply tune to a frequency, tap the KAT’s TUNE button, then 
hit the K3’s TUNE button. When the KAT finishes, drop the transceiver out of 
tune. This will tune the KAT500 for your antenna on that band segment. You may 
want to tune again elsewhere within the segment - there might be a better match 
that satisfies more of the segment than the first one you do. Second, use the 
KAT500 in MAN (not AUTO) mode. This is especially true with the use of SSB. 
Because of the characteristics of SSB transmission, the KAT may decide it needs 
to do a tune when it really does not. This is avoided in MAN mode where you get 
to decide when you want to do a tune.

One other thing to remember - an antenna changes over time for many reasons - 
it may behave differently when the feedline becomes wet (especially noted when 
using ladder-line), or in the rain, or when near-by foliage grows near the 
antenna. I regularly have to retune my antennas between summer and winter 
(fewer leaves in winter make a big difference). And yes, I do train my KAT500s 
(I have two) so that I do not have to stop and tune them in the midst of a 
contest. I make sure everything is set up and tuned before the contest starts, 
but I find I may have to retune one of my antennas (fed with ladder line) if it 
starts raining (or stops) during a contest event.

Enjoy your KAT500. It is a great product if I’m allowed to say so…

73,
Jack, W6FB


> On Jul 11, 2021, at 7:11 PM, Richard  wrote:
> 
> K3s/KAT500
> 
> As I now understand Frequency Tracking, it works like this:
> 
> 1. Once the KAT500 is "trained," the frequency segments attributed to each 
> band are places where the KAT500 will look for good SWR matches. In other 
> words, if I happen to have the VFO set on a frequency that is in Segment 5 
> (my label, just for clarity), the tuner will for for good matches in Segment 
> 5 — correct? 
> 
> 2. If no good matches are found in Segment 5, the KAT500 will do a Full Tune 
> to create one — correct?
> 
> 3. It seems to me that "Training the Tuner" is truly a convenience exercise: 
> populating segments in the band so the tuner will find a good match and not 
> have to do a Full Tune — correct?
> 
> 4. Rather than setting just low, middle, and high tuning solutions on 20 
> meter SSB, for example, I set a solution in each of the 11 segments, thinking 
> that no matter where I tune in 20 meter SSB, the KAT500 will find a good 
> solution. — correct?
> 
> Have I got this right . . . finally?
> 
> Cheers,
> 
> Richard Kunc
> W4KBX
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Re: [Elecraft] KAT500 ANT1 problem

[Jack Brindle via Elecraft]

Andy, my friend, you are forgetting something. The secondary toroid of the 
directional coupler has a direct path to ground. That means there is no 
straight-through DC path.

Rare that I catch Andy on something…

73,
Jack, W6FB


> On Jul 11, 2021, at 6:12 PM, Andy Durbin  wrote:
> 
> KAT500 antenna selection drops to ANT-1 when there is no power on KAT500.  
> Also, with no power on KAT500, the Bypass relay defaults to bypass state.  
> There should be a simple DC path between input RF connector and ANT-1 RF 
> connector if the KAT500 is not powered.
> 
> Pull the DC input plug and the coax connectors and measure DC resistance 
> between XMTR and ANT-1.  No fancy PIN diode switching in KAT500, it's all 
> relays.
> 
> 73,
> Andy, k3wyc
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[Elecraft] Frequency Tracking Revisited

[Richard]

K3s/KAT500

As I now understand Frequency Tracking, it works like this:

1. Once the KAT500 is "trained," the frequency segments attributed to each band 
are places where the KAT500 will look for good SWR matches. In other words, if 
I happen to have the VFO set on a frequency that is in Segment 5 (my label, 
just for clarity), the tuner will for for good matches in Segment 5 — correct? 

2. If no good matches are found in Segment 5, the KAT500 will do a Full Tune to 
create one — correct?

3. It seems to me that "Training the Tuner" is truly a convenience exercise: 
populating segments in the band so the tuner will find a good match and not 
have to do a Full Tune — correct?

4. Rather than setting just low, middle, and high tuning solutions on 20 meter 
SSB, for example, I set a solution in each of the 11 segments, thinking that no 
matter where I tune in 20 meter SSB, the KAT500 will find a good solution. — 
correct?

Have I got this right . . . finally?

Cheers,

Richard Kunc
W4KBX
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Re: [Elecraft] Question about antenna matching

[David Gilbert]

Hi, Al.

Yes, some mismatches are much more problematic than others, even for the 
same SWR.


One way to see this is to use TLW, the transmission line calculator that 
comes free with the ARRL Antenna Book.  Choose whatever load impedance 
you want in any combination of real and reactive values. Click the 
"Tuner" button to see various options for the tuner configuration and 
then set the Q for the capacitor(s) and coil to whatever you think is 
reasonable  The most common configurations would either be high pass 
L-Network or high pass T-network.


Not only will you see a diagram of the tuner with the required values to 
give a match, but you can see the voltage, current, and power loss 
(heating) for each component.  Try different load impedance combinations 
to see the different power losses.  The difference can be striking.


In general, low impedances will cause more tuner loss than higher 
impedances, and capacitive load reactance tends to be more problematic 
than inductive reactance.  That, of course, is mostly because real life 
inductors tend to have lower Q than capacitors, and that is certainly 
the case for auto tuners with ferrite core inductors.


As an aside, TLW is an amazing tool and most people don't give it the 
credit it is due.


73,
Dave   AB7E



On 7/11/2021 11:58 AM, Al Lorona wrote:

This question is about how manufacturers spec the matching range of their 
antenna tuners.

If an antenna system presents an impedance of 5 + j0 ohms to the antenna tuner, 
that's an SWR = 10 to 1.

But, an antenna impedance of 50 - j143 ohms is also SWR = 10. So is 110 - j200 
ohms.

When a manufacturer like Elecraft says, "Our antenna tuner can match a 10:1 
mismatch," does that mean the tuner can match the first case above, the second case, 
the third case, or all three?

I guess what I'm asking is, are all of the impedances above equally difficult 
for the same tuner to match? Or is one 'harder' than the others? It would 
depend on the values of the L and C in the tuner, wouldn't it? Which implies 
that certain 10:1 mismatches are not tunable?

Thanks,

Al  W6LX/4


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[Elecraft] KAT500 ANT1 problem

[Andy Durbin]

KAT500 antenna selection drops to ANT-1 when there is no power on KAT500.  
Also, with no power on KAT500, the Bypass relay defaults to bypass state.  
There should be a simple DC path between input RF connector and ANT-1 RF 
connector if the KAT500 is not powered.

Pull the DC input plug and the coax connectors and measure DC resistance 
between XMTR and ANT-1.  No fancy PIN diode switching in KAT500, it's all 
relays.

73,
Andy, k3wyc
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Re: [Elecraft] The next generation KAT500

[Julia Tuttle]

Hi Chuck,

I would appreciate a copy of your article if your offer still stands.

73,

Julie

On Sun, Jul 11, 2021 at 6:02 PM Chuck MacCluer  wrote:

> Actually there is a much simpler L-network search algorithm --- see my QEX
> article,
>
> "How to tune a L-network matchbox," Nov/Dec 2016.
>
> No iterations are required. You need only to sample reflected as well as
> forward minus reflected RF voltages on the line.
>
> Alas, QEX failed to print page 2 of the article so chaos reigned. Moreover,
> my approach only works without modification for high impedance loads. In
> general, knowing the forward and reflected RF voltages is enough to match
> without iteration.
>
> I will be delighted to email the complete article and erratum upon request.
>
> Chuck MacCluer w8mqw
> w8...@arrl.net
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Re: [Elecraft] The next generation KAT500

[Chuck MacCluer]

Actually there is a much simpler L-network search algorithm --- see my QEX
article,

"How to tune a L-network matchbox," Nov/Dec 2016.

No iterations are required. You need only to sample reflected as well as
forward minus reflected RF voltages on the line.

Alas, QEX failed to print page 2 of the article so chaos reigned. Moreover,
my approach only works without modification for high impedance loads. In
general, knowing the forward and reflected RF voltages is enough to match
without iteration.

I will be delighted to email the complete article and erratum upon request.

Chuck MacCluer w8mqw
w8...@arrl.net
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Re: [Elecraft] KAT500 ANT1 problem

[Dave]

I have had very good luck using American Radio Supply:

https://www.americanradiosupply.com/

and DXE connectors...

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

On 7/11/21 2:06 PM, Don Wilhelm wrote:
And discard those "Amazon Special" PL-259s. Use only quality 
connectors.  It is not worth it to use off-spec connectors - you are 
witness to the pain and heartache they can cause.


73,
Don W3FPR

On 7/11/2021 4:52 PM, Dave wrote:
If it were me, I'd replace the SO-239 on the tuner...  That way, you 
know the issue won't come back to haunt you later.


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

On 7/11/21 1:48 PM, kd...@frawg.org wrote:

Many thanks to Ken (K6MR), Joe (4X1RV), and Kirk (K6KAR) for your quick
answers and for providing the schematic information.
I pulled the unit and did some poke and prod testing with a DVM here 
on the

anti-static mat. My fear was that K18 had a bad contact in the ANT1
position. -Not!-
What had apparently happened was that I had a batch of the offshore made
"Amazon Special" PL-259s that appear to have a slightly oversize 
center pin.

The patch cable used until recently had one of them on one end. It had
spread the leaves on the ANT1 SO259 just enough that a good 
connector, when
perfectly centered and seated, did not make contact! Gentle 
recentering of

the leaves with a miniature flat blade screw drive yielded relief and a
self-administered head smack.
Jack Spitznagel - KD4IZ
Science River LLC
Biomedical Consulting Services



-Original Message-
From: kirk.hard...@k6kar.com 
Sent: Sunday, July 11, 2021 14:07
To: kd...@frawg.org
Subject: RE: [Elecraft] KAT500 ANT1 problem

Jack,

The KAT500 schematic is on line (partial)
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page1.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page2.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page5.png
  Although all schematics aren't available, this may be enough to get 
you

going.

73,

Kirk, K6KAR

-Original Message-
From: elecraft-boun...@mailman.qth.net 
 On

Behalf Of kd...@frawg.org
Sent: Sunday, July 11, 2021 12:38 PM
To: Elecraft@mailman.qth.net
Cc: 'Elecraft Support' 
Subject: [Elecraft] KAT500 ANT1 problem

All,


This is likely something very straight forward, but I do not have a
schematic to follow and troubleshoot.

Symptom: ANT 1 circuit seems to be dead. No match and fault on switch 
from

ANT2 to ANT1. No receive signal.

Tests:

Took KAT500 out of line to by-pass tuner, antenna on ANT1 is OK and will
match normally with rig's internal ATU.

With KAT500 back in line, selected each tuning position (AUTO, MAN, 
BYP) no

difference

With KAT500 still in line, ANT2 and ANT3 work nominally.

Checks:

Reset to factory defaults, restored last working Configuration, no 
change in

above behavior.


If I was a betting guy, I'd guess a relay or switching diode was open,
however - no schematic, don't really know.

Did I miss something



Does this little beastie need to go back to the mothership?


Thanks,

Jack Spitznagel - KD4IZ

Science River LLC

Biomedical Consulting Services



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delivered to kirk.hard...@k6kar.com


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Post: 

Re: [Elecraft] Question about antenna matching

[Jack Brindle via Elecraft]

There is another big consideration in modern ATUs which use toroid cores for 
the inductors. The cores will heat up during transmission, especially for bad 
mismatches. Remember, the ATU still has to deal with the high reflected power 
as it provides a good match for the radio. If the heating reaches a critical 
level, the toroid will break, and the ATU will no longer be able to do its job. 
ATUs are thus rated for the amount of reflected power (thus SWR) they can 
handle with some margin for failure. An ATU like the KAT will handle higher 
mismatches at low power, but when you start trying to push lots of power 
through it, the heating margins drop, meaning that you should really watch the 
match when trying to run a kilowatt through an ATU in order to avoid damaging 
it. At 50 watts the KAT should handle a pretty bad mismatch, while at 500 a 
lower maximum mismatch should be observed.

Also note that at higher power the connectors, adapters and coax cable will 
also see lots of heating with big mismatches. These can fail also; in fact we 
see that a lot. That’s why you see lots of admonitions to only use high quality 
connectors and adapters. Right angle adapters are especially bad as the 
conductor tends to migrate and short out at high power. Be sure that you use 
coax that is rated for the power levels as well. 

73,
Jack, W6FB


> On Jul 11, 2021, at 3:51 PM, Alan Bloom  wrote:
> 
> I can't speak directly about Elecraft tuners, but I did design an antenna 
> tuner when I was at Drake many years ago.
> 
> We specified the Drake MN-2700 at 5:1 SWR.  I made sure it would match that 
> SWR at all phase angles on all specified bands.
> 
> Typically the low-impedance end tends to be the hardest to match, at least on 
> the low bands.  So 50/5 = 10 ohms resistive is harder to match than 50*5 = 
> 250 ohms resistive even though the SWR is 5:1 in both cases.  That's because 
> the low impedances need larger tuning capacitors.  The Drake tuner would 
> typically match well above 5:1 into a high impedance but only barely meet 
> spec into a low impedance.  I suspect the Elecraft tuners are similar.
> 
> Alan N1AL
> 
> 
> On 7/11/2021 12:58 PM, Al Lorona wrote:
>> This question is about how manufacturers spec the matching range of their 
>> antenna tuners.
>> 
>> If an antenna system presents an impedance of 5 + j0 ohms to the antenna 
>> tuner, that's an SWR = 10 to 1.
>> 
>> But, an antenna impedance of 50 - j143 ohms is also SWR = 10. So is 110 - 
>> j200 ohms.
>> 
>> When a manufacturer like Elecraft says, "Our antenna tuner can match a 10:1 
>> mismatch," does that mean the tuner can match the first case above, the 
>> second case, the third case, or all three?
>> 
>> I guess what I'm asking is, are all of the impedances above equally 
>> difficult for the same tuner to match? Or is one 'harder' than the others? 
>> It would depend on the values of the L and C in the tuner, wouldn't it? 
>> Which implies that certain 10:1 mismatches are not tunable?
>> 
>> Thanks,
>> 
>> Al  W6LX/4
>> 
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Re: [Elecraft] KAT500 ANT1 problem

[kd4iz]

Don,
Already gone and replaced... 
Jack - KD4IZ

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Don Wilhelm
Sent: Sunday, July 11, 2021 17:07
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT500 ANT1 problem

And discard those "Amazon Special" PL-259s. Use only quality connectors.  It is 
not worth it to use off-spec connectors - you are witness to the pain and 
heartache they can cause.

73,
Don W3FPR

On 7/11/2021 4:52 PM, Dave wrote:
> If it were me, I'd replace the SO-239 on the tuner...  That way, you 
> know the issue won't come back to haunt you later.
>
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist, RFI
> ARRL Asst. Director, NW Division, Technical Resources
>
> On 7/11/21 1:48 PM, kd...@frawg.org wrote:
>> Many thanks to Ken (K6MR), Joe (4X1RV), and Kirk (K6KAR) for your 
>> quick answers and for providing the schematic information.
>> I pulled the unit and did some poke and prod testing with a DVM here 
>> on the anti-static mat. My fear was that K18 had a bad contact in the 
>> ANT1 position. -Not!- What had apparently happened was that I had a 
>> batch of the offshore made "Amazon Special" PL-259s that appear to 
>> have a slightly oversize center pin.
>> The patch cable used until recently had one of them on one end. It 
>> had spread the leaves on the ANT1 SO259 just enough that a good 
>> connector, when perfectly centered and seated, did not make contact! 
>> Gentle recentering of the leaves with a miniature flat blade screw 
>> drive yielded relief and a self-administered head smack.
>> Jack Spitznagel - KD4IZ
>> Science River LLC
>> Biomedical Consulting Services
>>
>>
>>
>> -Original Message-
>> From: kirk.hard...@k6kar.com 
>> Sent: Sunday, July 11, 2021 14:07
>> To: kd...@frawg.org
>> Subject: RE: [Elecraft] KAT500 ANT1 problem
>>
>> Jack,
>>
>> The KAT500 schematic is on line (partial) 
>> https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page1.png
>> https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page2.png
>> https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page5.png
>>   Although all schematics aren't available, this may be enough to get 
>> you going.
>>
>> 73,
>>
>> Kirk, K6KAR
>>
>> -Original Message-
>> From: elecraft-boun...@mailman.qth.net 
>>  On Behalf Of kd...@frawg.org
>> Sent: Sunday, July 11, 2021 12:38 PM
>> To: Elecraft@mailman.qth.net
>> Cc: 'Elecraft Support' 
>> Subject: [Elecraft] KAT500 ANT1 problem
>>
>> All,
>>
>>
>> This is likely something very straight forward, but I do not have a 
>> schematic to follow and troubleshoot.
>>
>> Symptom: ANT 1 circuit seems to be dead. No match and fault on switch 
>> from
>> ANT2 to ANT1. No receive signal.
>>
>> Tests:
>>
>> Took KAT500 out of line to by-pass tuner, antenna on ANT1 is OK and 
>> will match normally with rig's internal ATU.
>>
>> With KAT500 back in line, selected each tuning position (AUTO, MAN,
>> BYP) no
>> difference
>>
>> With KAT500 still in line, ANT2 and ANT3 work nominally.
>>
>> Checks:
>>
>> Reset to factory defaults, restored last working Configuration, no 
>> change in above behavior.
>>
>>
>> If I was a betting guy, I'd guess a relay or switching diode was open,
>> however - no schematic, don't really know.
>>
>> Did I miss something
>>
>>
>>
>> Does this little beastie need to go back to the mothership?
>>
>>
>> Thanks,
>>
>> Jack Spitznagel - KD4IZ
>>
>> Science River LLC
>>
>> Biomedical Consulting Services
>>
>>
>>
>> __
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft@mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html 
>> Message
>> delivered to kirk.hard...@k6kar.com
>>
>>
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>> Message delivered to d...@nk7z.net
>>
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Re: [Elecraft] KAT500 ANT1 problem

[Don Wilhelm]

And discard those "Amazon Special" PL-259s. Use only quality 
connectors.  It is not worth it to use off-spec connectors - you are 
witness to the pain and heartache they can cause.


73,
Don W3FPR

On 7/11/2021 4:52 PM, Dave wrote:
If it were me, I'd replace the SO-239 on the tuner...  That way, you 
know the issue won't come back to haunt you later.


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

On 7/11/21 1:48 PM, kd...@frawg.org wrote:

Many thanks to Ken (K6MR), Joe (4X1RV), and Kirk (K6KAR) for your quick
answers and for providing the schematic information.
I pulled the unit and did some poke and prod testing with a DVM here 
on the

anti-static mat. My fear was that K18 had a bad contact in the ANT1
position. -Not!-
What had apparently happened was that I had a batch of the offshore made
"Amazon Special" PL-259s that appear to have a slightly oversize 
center pin.

The patch cable used until recently had one of them on one end. It had
spread the leaves on the ANT1 SO259 just enough that a good 
connector, when
perfectly centered and seated, did not make contact! Gentle 
recentering of

the leaves with a miniature flat blade screw drive yielded relief and a
self-administered head smack.
Jack Spitznagel - KD4IZ
Science River LLC
Biomedical Consulting Services



-Original Message-
From: kirk.hard...@k6kar.com 
Sent: Sunday, July 11, 2021 14:07
To: kd...@frawg.org
Subject: RE: [Elecraft] KAT500 ANT1 problem

Jack,

The KAT500 schematic is on line (partial)
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page1.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page2.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page5.png
  Although all schematics aren't available, this may be enough to get 
you

going.

73,

Kirk, K6KAR

-Original Message-
From: elecraft-boun...@mailman.qth.net 
 On

Behalf Of kd...@frawg.org
Sent: Sunday, July 11, 2021 12:38 PM
To: Elecraft@mailman.qth.net
Cc: 'Elecraft Support' 
Subject: [Elecraft] KAT500 ANT1 problem

All,


This is likely something very straight forward, but I do not have a
schematic to follow and troubleshoot.

Symptom: ANT 1 circuit seems to be dead. No match and fault on switch 
from

ANT2 to ANT1. No receive signal.

Tests:

Took KAT500 out of line to by-pass tuner, antenna on ANT1 is OK and will
match normally with rig's internal ATU.

With KAT500 back in line, selected each tuning position (AUTO, MAN, 
BYP) no

difference

With KAT500 still in line, ANT2 and ANT3 work nominally.

Checks:

Reset to factory defaults, restored last working Configuration, no 
change in

above behavior.


If I was a betting guy, I'd guess a relay or switching diode was open,
however - no schematic, don't really know.

Did I miss something



Does this little beastie need to go back to the mothership?


Thanks,

Jack Spitznagel - KD4IZ

Science River LLC

Biomedical Consulting Services



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Re: [Elecraft] KAT500 ANT1 problem

[Dave]

If it were me, I'd replace the SO-239 on the tuner...  That way, you 
know the issue won't come back to haunt you later.


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

On 7/11/21 1:48 PM, kd...@frawg.org wrote:

Many thanks to Ken (K6MR), Joe (4X1RV), and Kirk (K6KAR) for your quick
answers and for providing the schematic information.
I pulled the unit and did some poke and prod testing with a DVM here on the
anti-static mat. My fear was that K18 had a bad contact in the ANT1
position. -Not!-
What had apparently happened was that I had a batch of the offshore made
"Amazon Special" PL-259s that appear to have a slightly oversize center pin.
The patch cable used until recently had one of them on one end. It had
spread the leaves on the ANT1 SO259 just enough that a good connector, when
perfectly centered and seated, did not make contact! Gentle recentering of
the leaves with a miniature flat blade screw drive yielded relief and a
self-administered head smack.
Jack Spitznagel - KD4IZ
Science River LLC
Biomedical Consulting Services



-Original Message-
From: kirk.hard...@k6kar.com 
Sent: Sunday, July 11, 2021 14:07
To: kd...@frawg.org
Subject: RE: [Elecraft] KAT500 ANT1 problem

Jack,

The KAT500 schematic is on line (partial)
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page1.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page2.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page5.png
  Although all schematics aren't available, this may be enough to get you
going.

73,

Kirk, K6KAR

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of kd...@frawg.org
Sent: Sunday, July 11, 2021 12:38 PM
To: Elecraft@mailman.qth.net
Cc: 'Elecraft Support' 
Subject: [Elecraft] KAT500 ANT1 problem

All,

  


This is likely something very straight forward, but I do not have a
schematic to follow and troubleshoot.

Symptom: ANT 1 circuit seems to be dead. No match and fault on switch from
ANT2 to ANT1. No receive signal.

Tests:

Took KAT500 out of line to by-pass tuner, antenna on ANT1 is OK and will
match normally with rig's internal ATU.

With KAT500 back in line, selected each tuning position (AUTO, MAN, BYP) no
difference

With KAT500 still in line, ANT2 and ANT3 work nominally.

Checks:

Reset to factory defaults, restored last working Configuration, no change in
above behavior.

  


If I was a betting guy, I'd guess a relay or switching diode was open,
however - no schematic, don't really know.

Did I miss something

  

  


Does this little beastie need to go back to the mothership?

  


Thanks,

Jack Spitznagel - KD4IZ

Science River LLC

Biomedical Consulting Services

  

  


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Re: [Elecraft] Question about antenna matching

[Alan Bloom]

I can't speak directly about Elecraft tuners, but I did design an 
antenna tuner when I was at Drake many years ago.


We specified the Drake MN-2700 at 5:1 SWR.  I made sure it would match 
that SWR at all phase angles on all specified bands.


Typically the low-impedance end tends to be the hardest to match, at 
least on the low bands.  So 50/5 = 10 ohms resistive is harder to match 
than 50*5 = 250 ohms resistive even though the SWR is 5:1 in both 
cases.  That's because the low impedances need larger tuning 
capacitors.  The Drake tuner would typically match well above 5:1 into a 
high impedance but only barely meet spec into a low impedance.  I 
suspect the Elecraft tuners are similar.


Alan N1AL


On 7/11/2021 12:58 PM, Al Lorona wrote:

This question is about how manufacturers spec the matching range of their 
antenna tuners.

If an antenna system presents an impedance of 5 + j0 ohms to the antenna tuner, 
that's an SWR = 10 to 1.

But, an antenna impedance of 50 - j143 ohms is also SWR = 10. So is 110 - j200 
ohms.

When a manufacturer like Elecraft says, "Our antenna tuner can match a 10:1 
mismatch," does that mean the tuner can match the first case above, the second case, 
the third case, or all three?

I guess what I'm asking is, are all of the impedances above equally difficult 
for the same tuner to match? Or is one 'harder' than the others? It would 
depend on the values of the L and C in the tuner, wouldn't it? Which implies 
that certain 10:1 mismatches are not tunable?

Thanks,

Al  W6LX/4

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Re: [Elecraft] Question about antenna matching

[Dave]

I take it to mean, the tuner will "probably" match any halfway well 
designed antenna...


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

On 7/11/21 11:58 AM, Al Lorona wrote:

This question is about how manufacturers spec the matching range of their 
antenna tuners.

If an antenna system presents an impedance of 5 + j0 ohms to the antenna tuner, 
that's an SWR = 10 to 1.

But, an antenna impedance of 50 - j143 ohms is also SWR = 10. So is 110 - j200 
ohms.

When a manufacturer like Elecraft says, "Our antenna tuner can match a 10:1 
mismatch," does that mean the tuner can match the first case above, the second case, 
the third case, or all three?

I guess what I'm asking is, are all of the impedances above equally difficult 
for the same tuner to match? Or is one 'harder' than the others? It would 
depend on the values of the L and C in the tuner, wouldn't it? Which implies 
that certain 10:1 mismatches are not tunable?

Thanks,

Al  W6LX/4

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Re: [Elecraft] KAT500 ANT1 problem

[kd4iz]

Many thanks to Ken (K6MR), Joe (4X1RV), and Kirk (K6KAR) for your quick
answers and for providing the schematic information. 
I pulled the unit and did some poke and prod testing with a DVM here on the
anti-static mat. My fear was that K18 had a bad contact in the ANT1
position. -Not!- 
What had apparently happened was that I had a batch of the offshore made
"Amazon Special" PL-259s that appear to have a slightly oversize center pin.
The patch cable used until recently had one of them on one end. It had
spread the leaves on the ANT1 SO259 just enough that a good connector, when
perfectly centered and seated, did not make contact! Gentle recentering of
the leaves with a miniature flat blade screw drive yielded relief and a
self-administered head smack.
Jack Spitznagel - KD4IZ
Science River LLC
Biomedical Consulting Services



-Original Message-
From: kirk.hard...@k6kar.com  
Sent: Sunday, July 11, 2021 14:07
To: kd...@frawg.org
Subject: RE: [Elecraft] KAT500 ANT1 problem

Jack,

The KAT500 schematic is on line (partial)
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page1.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page2.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page5.png
 Although all schematics aren't available, this may be enough to get you
going.

73,

Kirk, K6KAR

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of kd...@frawg.org
Sent: Sunday, July 11, 2021 12:38 PM
To: Elecraft@mailman.qth.net
Cc: 'Elecraft Support' 
Subject: [Elecraft] KAT500 ANT1 problem

All,

 

This is likely something very straight forward, but I do not have a
schematic to follow and troubleshoot.

Symptom: ANT 1 circuit seems to be dead. No match and fault on switch from
ANT2 to ANT1. No receive signal.

Tests: 

Took KAT500 out of line to by-pass tuner, antenna on ANT1 is OK and will
match normally with rig's internal ATU.

With KAT500 back in line, selected each tuning position (AUTO, MAN, BYP) no
difference

With KAT500 still in line, ANT2 and ANT3 work nominally.

Checks:

Reset to factory defaults, restored last working Configuration, no change in
above behavior.

 

If I was a betting guy, I'd guess a relay or switching diode was open,
however - no schematic, don't really know.

Did I miss something

 

 

Does this little beastie need to go back to the mothership?

 

Thanks,

Jack Spitznagel - KD4IZ

Science River LLC

Biomedical Consulting Services

 

 

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[Elecraft] Question about antenna matching

[Al Lorona]

This question is about how manufacturers spec the matching range of their 
antenna tuners.

If an antenna system presents an impedance of 5 + j0 ohms to the antenna tuner, 
that's an SWR = 10 to 1.

But, an antenna impedance of 50 - j143 ohms is also SWR = 10. So is 110 - j200 
ohms.

When a manufacturer like Elecraft says, "Our antenna tuner can match a 10:1 
mismatch," does that mean the tuner can match the first case above, the second 
case, the third case, or all three?

I guess what I'm asking is, are all of the impedances above equally difficult 
for the same tuner to match? Or is one 'harder' than the others? It would 
depend on the values of the L and C in the tuner, wouldn't it? Which implies 
that certain 10:1 mismatches are not tunable?

Thanks,

Al  W6LX/4

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[Elecraft] KAT500 ANT1 problem

[kd4iz]

All,

 

This is likely something very straight forward, but I do not have a
schematic to follow and troubleshoot.

Symptom: ANT 1 circuit seems to be dead. No match and fault on switch from
ANT2 to ANT1. No receive signal.

Tests: 

Took KAT500 out of line to by-pass tuner, antenna on ANT1 is OK and will
match normally with rig's internal ATU.

With KAT500 back in line, selected each tuning position (AUTO, MAN, BYP) no
difference

With KAT500 still in line, ANT2 and ANT3 work nominally.

Checks:

Reset to factory defaults, restored last working Configuration, no change in
above behavior.

 

If I was a betting guy, I'd guess a relay or switching diode was open,
however - no schematic, don't really know.

Did I miss something

 

 

Does this little beastie need to go back to the mothership?

 

Thanks,

Jack Spitznagel - KD4IZ

Science River LLC

Biomedical Consulting Services

 

 

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[Elecraft] 7-4-2021

[Eric Lanzl]

Here is the list of stations checking in to the SSB Net for Sunday,  July 4, 
2021. Thank you to the relay stations and to all who are patient with the bad 
conditions. 

Here are the SSB Nets on Sundays:
20M Net 14.303.5 at 1800Z  alternate frequency 14.31040 M Net  7280    at  
1900ZZoom get together 2000Z contact K8NU for the link. See qrz for his 
email80M  Net  3775 or there about depending upon use of the frequency at 
0100ZAll stations are welcome and one does not have to have an Elecraft radio 
to participate. 
Eric WB9JNZ


Call  Name    State  Radio    Serial # QRP    Notes

WB9JNZ  Eric   IL  K3 4017  
    NetControl 

W1NGA   Al  CO    Flex   6400M  
  

AE6JV  Bill    NH    K3 6299    
   

N6JW   John  CA    K3 936   
 RelayStation 

KJ6DKF   Seven    AZ KX3  11390     
    

KB9AVO Paul   IN  K4 76 
  

WM6P  Steve GA    K3S   11453   
 RelayStation 

NS7P    Phil   OR    K3 1826    
  RelayStation 

KO5V   Jim    NM    K2/100  7225    
   

AB7CE Roy   MT    K2/100  40    
   

KL7UW    Ed AK    K3/ KX3  4340 / 475   
     

N4NRW   Roger    SC K3 1318 
 RelayStation 

W4DML   Doug TN K3 6433 
  

KC9USC  Robert   IL  KX3  4460  
     

K7BRR/OR  Bill    OR    K3 2693 
  

WA0BEU Keith CO    KX3  7408    
   

K8NU   Carl   OH    YaesuFT  101DX  
  

KC0WHU Brian CO    Yaesu    FT 450  
  

N7YW  Ken   AZ K3 8183  
     

K6VWE    Stan   MI K3 650   
  

W9EJB Ed IN  K3 1593    
   

K5PD   Pete   TX K3 545     
    

K0JFJ   Nick  MN    K2 7937 
  

N2TNQ    Len    NJ      K3 5270 
  
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[Elecraft] SSB Net 6-27-2021

[Eric Lanzl]

Here is the list of stations checking in to the SSB Net for Sunday,  June 27, 
2021. Thank you to the relay stations and to all who are patient with the bad 
conditions. 

Here are the SSB Nets on Sundays:
20M Net 14.303.5 at 1800Z  alternate frequency 14.31040 M Net  7280    at  
1900ZZoom get together 2000Z contact K8NU for the link. See qrz for his 
email80M  Net  3775 or there about depending upon use of the frequency at 
0100ZAll stations are welcome and one does not have to have an Elecraft radio 
to participate. 
Eric WB9JNZ

Call  Name    State  Radio    Serial # QRP  
   Notes

WB9JNZ  Eric   IL  K3 4017  
    NetControl

K8NU  Carl   OH    YaesuFT   101DX  
  

NC0JW      CO    KX3  1356  
    RelayStation 

WM6P  Steve GA    K3S   11453   
 RelayStation 

AE6JV Bill    NH    K3 6299 
 RelayStation 

K7BRR/P Bill    UT    YaesuFT   DX 10   
  

KB9AVO Paul   IN K4     
   

N4NRW   Roger    SC K3 1318 
 RelayStation 

KO5V  Jim    NM   K2/100  7225  
     

W3SA  John  NC    Kenwood   TS 890  
  

KJ6DKF   Seven    AZ    KX3  11390      
   

K6VWE   Stan   MI K3 650    
     

AL5P    David    TX    Icom  7300   
    

N2TNQ    Len    NJ K3 5270  
     

W1NGA   Al  CO    KX2  2002 
  

WX7F  Steve MT    Icom  7300    
   

AD4VE    Dave CA    YaesuFT   DX 101    
   

KA5HRF  Butch    TX    Elecraft KX3     
   

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