"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
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Help:
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
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
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
"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,
Jim,
You are correct! It is clearly not the same problem. I was trying to correct my
"bad memory" offering from last evening.
Thanks, Jim - WS6X
-Original Message-
From: elecraft-boun...@mailman.qth.net On Behalf Of James Bennett via Elecraft
Sent: Friday, April 01, 2022 3:36 PM
To:
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
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
I seemed to have misplaced my original invoice, and the Elecraft website seems
to no longer list the ref osc upgrade, but I recall the "F/W corrected" verbiage
on the invoice for my K3S. This was always a puzzle to me, but not enough to
investigate. Frankly, I don't know what that means.
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
In my K3S, since I have no need for a second RX, I've installed a TMP cable from
the ref board to a BNC in a spare hole in the rear panel. This gives me a point
to measure the ref osc frequency with an external counter, with the unit all
buttoned up. For that I use a FA-2 counter by BD7BTL
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
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
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
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
>
"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
"However, if the rigs are on different bands, you do need to rely on frequency
sensing by the amp."
You don't have to do this, but it does take a bit of extra hardware/software to
interface two K3s to a KPA1500. In addition to the necessary relays to switch
the RF path you can use an
"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
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
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 bands, you do need to rely on
frequency sensing by the amp. Not sure if the KPA500 does that.
GL
Frank, W2YK
-Original Message-
From: James Bennett
Thanks W9ZD
> On Mar 30, 2022, at 10:22 AM, Lance Collister, W7GJ
> wrote:
>
> I have one in my K3 and I am SO GLAD I do! The frequency is ROCK SOLID even
> up to 2m. That enables me to use the most sensitive narrow band digital modes
> for weak signal EME. I have also been able to use my K3
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
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