Key clicks don't require non-linearity. They are the result of
modulating with a signal that has an infinite bandwidth, because of the
sharp transitions at leading and trailing edges. That results in
infinite side bands. (Actually any signal that communicates information
in finite time will
No - it does not spontaneously go into transmit more. The problem is that on
the non-Elecraft radio, placing the KPA into transmit mode (with a button push
on the KPA) drops the non-Elecraft radio’s receive signal tremendously. See
Jack’s explanation in an earlier post on what the K3 is doing
I don’t think your point #1 is valid. The K3 will cause the KPA to change bands
when it does a band change and sends out changed bits on the BAND signals. If
you don’t change bands on the K3, then the KPA won’t have a reason to change.
The problem with this, when RADIO = K3, is that tapping a
"Just gave it a try. No joy, same result - lowered rx signal strength on the
IC-705. Jack indicated that the K3 sets the Vcc rail to zero volts on power
off, and that is causing the amp to go into Operate mode. "
Maybe I lost the plot but wasn't the problem that the KPA500 was being keyed,
Chuck,
Just gave it a try. No joy, same result - lowered rx signal strength on the
IC-705. Jack indicated that the K3 sets the Vcc rail to zero volts on power
off, and that is causing the amp to go into Operate mode.
I see the following options -
1. Always put the K3 on the same band as the
Or perhaps OOKPWM? That was the only available modulating technique for
spark transmitters. For all it's apparent simplicity, it is still
possible to create a rotten signal, and it is notoriously difficult to
decode ... unless you're a human being.
My modest home station is comprised of
On 4/1/2022 2:35 PM, kevin wrote:
It is more accurately referenced as Discontinuous Wave.
Actually, it is 100% amplitude modulation of a carrier by a rectangular
wave train. That modulation excites non-linearity in the transmitter
signal chain and produce intermodulation distortion that is
Hhhmmm... I'm coming late to this thread, as I wasn't paying attention
before.
Please forgive me if I have missed something but -
I have, in the past, used both a K3S AND an old Yaesu FT-101ZD with my
KPA/KAT 500 power combo. I *THINK* that is similar to what Jim is trying
to do.
Here is what
For the same reason we call using Morse Code CW.
It is more accurately referenced as Discontinuous Wave.
73, Kevin. KD5ONS
On 4/1/22 13:23, Fred Jensen wrote:
Why do we call this "wireless?"
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Jack Brindle via Elecraft wrote on
Why do we call this "wireless?"
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Jack Brindle via Elecraft wrote on 3/31/2022 9:47 PM:
OK, now this is starting to make sense. Jim’s K3 has a KIO3, not the newer
KIO3B. On the older board, the BAND and PTT lines have pullup resistors to
22 3:36 PM
To: Elecraft Reflector Reflector
Subject: Re: [Elecraft] KPA500 Issue
Jim,
I don’t think this is the same problem as you had. The receive signal on my K3
does NOT drop off when placing the amp in OPER. With my antenna switched over
to the IC-705 (not the K3), the received signal does dro
Jim,
I don’t think this is the same problem as you had. The receive signal on my K3
does NOT drop off when placing the amp in OPER. With my antenna switched over
to the IC-705 (not the K3), the received signal does drop off when the amp is
placed into OPER mode. Thus, I’m pretty certain that
"However, what I'm seeing is that when the amp is in OPER mode, my receive
signal strength drops way, way off to the point I have to go full AF volume
to hear signals. If I put the amp in STBY, signal levels go back to normal."
These exact symptoms have been associated in past reports with a
SO2R setup and interleave QSOs.
Ken K6MR
From: elecraft-boun...@mailman.qth.net on
behalf of Frank Scolaro
Sent: Friday, April 1, 2022 8:46 AM
To: James Bennett ; Elecraft Reflector Reflector
Subject: Re: [Elecraft] KPA500 Issue
Jim,.
I use the "1A2R" (one
In the attached email Frank W2yk wrote the 1A2R from 404A. I only find a 403.
Please advise
Ralph, w7HSG/AFA9RT
> On 04/01/2022 9:48 AM Rick Bates, NK7I wrote:
>
>
> It does. But you HAVE to remember to send a dit on each band change so
> the amp knows where you are.
>
> 73,
> Rick NK7I
>
"Pulling the audio cable when I want to use the IC-705 with the amp isn’t
practical due to the location of the radio."
The high density 15 pin connectors used on the Aux cable is readily available
and inexpensive. Why not make an adapter that allows the PTT line (pin 10) to
be switched
It does. But you HAVE to remember to send a dit on each band change so
the amp knows where you are.
73,
Rick NK7I
On 4/1/2022 8:46 AM, Frank Scolaro wrote:
Jim,.
I use the "1A2R" (one amp tw0 radios) from 4O4A. I have two rigs share my KPA1500. However, if the rigs are on different
es Bennett
Sent: Apr 1, 2022 11:02 AM
To: Elecraft Reflector Reflector
Subject: Re: [Elecraft] KPA500 Issue
Well, it looks like there is no simple solution to this dilemma. I was hoping
to (easily) be able to use the amp with either rig while both were here in the
shack. Pulling the audio cable w
Well, it looks like there is no simple solution to this dilemma. I was hoping
to (easily) be able to use the amp with either rig while both were here in the
shack. Pulling the audio cable when I want to use the IC-705 with the amp isn’t
practical due to the location of the radio. I changed the
"The reason I don’t suspect the PIN diodes is that the KPA works properly with
the K3. "
Sorry, I missed that part.
73,
Andy, k3wyc
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
Now let me answer my own question. There is a key-line interrupter adapter that
I believe comes with the AUXIO cable. This is an HD-15 type adapter that will
block the PTT signal from the K3 to the AUXIO cable. Use this, then you will
need to connect the K3 to the KAT500/KPA500 using a phono
OK, now this is starting to make sense. Jim’s K3 has a KIO3, not the newer
KIO3B. On the older board, the BAND and PTT lines have pullup resistors to the
Vcc rail.
When the K3 is powered off, that Vcc rail is at 0 volts, which means the
pull-ups are now pulldowns. Thus the K3 is inadvertently
The reason I don’t suspect the PIN diodes is that the KPA works properly with
the K3. The K3 does not have a magical ability to repair KPA PIN diodes, so it
most likely is not a problem there.
This is probably a K3 without the new K3S I/O board, which means it has pull-up
resistors on the BAND
The email I sent earlier. You might look in your junk folder, Jim…
73,
Jack, W6FB
> From: Jack Brindle
> Subject: Re: KPA500 Issue
> Date: March 31, 2022 at 2:40:26 PM CDT
> To: James Bennett
>
> On the KPA front panel, hold the menu button to go into the menus, then
> scroll down to the
"p.s. do you have any idea what Jack was talking about when he said "switch the
RADIO setting of the KPA from K3 to something else, either Serial or Analog”??"
KPA500 menu / Radio / (Serial/Analog/BCD/K3).
Andy, k3wyc
__
Elecraft
Bob -
The * appears when I key the K3 and the amp is in operate mode. Likewise if I
key the 705 and the amp is in operate mode, with the K3 powered on.
If I power off the K3 and place the amp in operate mode WITHOUT KEYING IT, the
* appears, so you are correct - the amp thinks it is being
Jim, All,
James Bennett Wrote:
> However, what I?m seeing is that when the amp is in OPER mode, my receive
> signal strength drops way, way off to the point I have to go full AF volume
> to hear signals. If I put the amp in STBY, signal levels go back to normal. I
> also notice that the amp
Jim,
See page 38 of the Rev E1 KPA500 operating manual for how to set the radio
in the KPA500 menu (not KPA500 utility). This is the current version of
the manual a available on the Elecraft website.
73,
Lyle Kk7P
On Thu, Mar 31, 2022 at 5:12 PM Jim Clymer wrote:
> In my case, it was not the
In my case, it was not the PIN diodes themselves, but failure of R9. I'm
away from my shack right now, so may not have the resistor ID correct. It
is a 48 Ohm resistor. I fixed the problem by parallel connecting a pair of
1/4 W, 100 Ohm resistors across the open one. Problem solved. Been fine
I was unable to try Jack’s suggestion of disconnecting the AUXIO cable - doing
so made the KPA5000 not able to go into Operate mode. So, I wanted to do the
other option he mentioned - changing the “radio” setting of the KPA to Serial
or Analog. Unfortunately, I have no idea where that setting
"However, what I’m seeing is that when the amp is in OPER mode, my receive
signal strength drops way, way off to the point I have to go full AF volume to
hear signals. If I put the amp in STBY, signal levels go back to normal."
These exact symptoms have been associated in past reports with a
m;
What happens when you disconnect the AuxIO cable from the K3 to the KPA? The
other solution is to switch the RADIO setting of the KPA from K3 to something
else, either Serial or Analog. If nothing is connected to the analog band input
with RADIO = ANALOG, the KPA should work as usual.
I think you have enough information to order a replacement from Elecraft.
73 Bill AE6JV
On 11/9/20 at 3:55 PM, kb2mj...@att.net wrote:
> I had a capacitor fail in my KPA500's 15m bank pass filter area. It is C151
> a 100pf capacitor. Does anyone know what physical size it is, so I can order
>
:34 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 Issue
Hi Barry,
There is an asterisk that appears on the left side of the KPA500 display
whenever the key out signal from your transmitter is present. You should not
see the asterisk when you are receiving. If you
Hi Barry,
While your experience suggests that a transistor switch will probably save
the day I also wonder if the problem is the result of the absence or
presence of a pull-up resistor or perhaps a floating common connection
between the rig and amp. Maybe a resistor in the plug would help. I
when I switch it from
Stby to Oper, the level of received signals drops by around 5 or 6 s
points. It still transmits fine and there are no adverse SWR indications or
loose co-ax plugs. It does the same on all bands.
Sounds like bad PIN DIODE situation, but I'll let those who are more
Looks like the Kenwood switches high during transmit and the KPA500
requires a low for transmit. KPA500 specs in my manual say +5V max, open
circuit on receive, closed to ground on transmit. My old KPA500 manual
doesn't show Kenwood interconnections. Only the K3, Yaesu and Icom.
Yup, ya
Good morning to those who responded to me on the Elecraft reflector. Here
is the interim outcome.
I did not mention that the problem arose after connecting my brand new
(yesterday) TS590SG to the KPA500. The TS590SG has different linear
switching facilities from the TS590S in that there is now
Hi Barry,
There is an asterisk that appears on the left side of the KPA500 display
whenever the key out signal from your transmitter is present. You should not
see the asterisk when you are receiving. If you are then is it possible that
you are using the key out signal to operate some other
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