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.
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
"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,
"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
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,
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
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
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
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
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
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
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,
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
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
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,
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
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
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
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
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
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
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
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
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