Hi David,
I was a civilian Electrical Engineer with the US Army before the FAA
stint. We absolutely required the components used in critical systems to
be operated well below the "rated" thresholds. I did HV substation
design for places such as Marshall Space Flight Center and Redstone
Arsenal
I just made the contact with Mas JA3FYC, just now , thanks to Carl
http://vk4tux.duckdns.org/KX3/1908_1.jpg
http://vk4tux.duckdns.org/KX3/1908_2.jpg
On 17/4/20 4:28 am, Adrian wrote:
The answer for this (Use OmniRig as wsjtx radio rig choice, and setup
OmniRig for KX3) came from Carl N4PY ;
Thanks all for the replies.
- I saw the same issue on ANT 1 as ANT 2.
- Haven't dug out a dummy load yet... still TODO.
New clue: Dialing the power down to 8W fixes the RX path (can go back and
forth across this boundary and hear the RX go in and out, coincident w/ a
relay click), but *not* the
The answer for this (Use OmniRig as wsjtx radio rig choice, and setup
OmniRig for KX3) came from Carl N4PY ;
"Carl, absolutely brilliant thankyou. This is the real answer I have been
looking for since discovering the issue,
and I have just tested split function here now all ok, retaining the B
Ray,
I reported to this forum (ca. February 2019) a similar, though not
identical, problem involving my K3/10 while running from an Astron RS-20A
supply. My problem occurred in receive mode rather than transmit mode,
which made it a bit more difficult to understand because the current demand
for
You can try it, but I think the real solution may be to leave the XV powered
while the K3 is on.
The reason is that the XV has weak pull-up to +5V on its Auxbus line. When the
XV is off, that 5V line is actually at 0 volts,
which means it is pulling the signal to the common reference. This,
Many to all who posted/responded to my recent post about an electrolytic
capacitor failure in my power supply. Lots of very interesting reading
about peoples' industry experiences - thank you!
Several have pointed out that using a 20A supply with my K3/100 is pushing
close to (or over!) the
They are rarely operated 24/7, and they aren't usually supervised by
career engineers. Most hams are relatively inexperienced hobbyists who
may not recognize a problem until it is catastrophic. Someone in this
thread already mentioned that nearly all ham shacks have a bad
electrolytic lurking
Jack;
In my setup, the XV is connected to 12V, but is not "on" until it is
selected by changing the K3 to 2 meters (which, of course, is just what
it won't do.) The KAT500 is normally left on 24/7. I do not use the
"Auto" selection on the KAT500, so it can't surprise me with an unwanted
If Ray has a K3/10, then the power supply is perfectly fine. The recommendation
for that is "13.8VDC @ 6A for K3/10”.
There are a lot of K3/10’s in the field. Nothing in his post indicated which
transceiver he has.
However, if indeed he has a K3/100, then Frank is right (as usual). Ray should
George;
That message occurs because something is loading the Auxbus when the K3 is
powered on. Make sure that the KAT500 and the XV144 are both powered up when
you turn on the K3. They can be powered on at the same time, but the task needs
to be done before the K3 enumerates the Auxbus, which
That dates you, Bob. Ipana "died" over 40 years ago. If you still have some
...
73
Lyn, W0LEN
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bob McGraw K4TAX
Sent: Wednesday, April 15, 2020 5:59 PM
To: Tom & Barb
I also retired from FAA. Maybe the Air Defense Long Range ARSR 4 RADARs ,
BI-6, MODE-S and dozens of other 24/7 sytems, are not "critical systems".
Power supply issues were rare. Some of the most robust supplies I have ever
experienced.
Every ham shack I have ever seen has at least one bad
KAT500 leaves unselected antenna ports open circuit and defaults to port 1 when
power is removed. The relays are not latching.
I don't have details for the KPA1500 but the ATU board photos available here -
https://fccid.io/UTR-KPA1500 - have high enough resolution to trace the
output
Hello Gill
Doing reliability calculations to MIL 217 was very instructive many years ago
and it taught me that operating well under the limits extended MTBF a lot.
Some military customers instructed that specs were 60% or more degraded to
achieve longer service life. What was your experience
ok thanks guys
carlos
Op do 16 apr. 2020 om 16:17 schreef Don Wilhelm :
> Carlos,
>
> Yes, you can use the SA612 to replace the SA602. In fact, many SA602s
> are manufactured as SA612s, but marked as SA602.
>
> 73,
> Don W3FPR
>
> On 4/16/2020 8:20 AM, carlos.p wrote:
> > hi,there is an smd
As Harlan pointed out - I was an engineer for the FAA until retirement -
We changed electrolytics as part of normal PM's on critical systems
usually every 5 years or so. CDE (Cornell Dubilier) indicates expected
life (MTBF) of devices operated within rated voltage & temp specs to be
about
Carlos,
Yes, you can use the SA612 to replace the SA602. In fact, many SA602s
are manufactured as SA612s, but marked as SA602.
73,
Don W3FPR
On 4/16/2020 8:20 AM, carlos.p wrote:
hi,there is an smd replacement for u1 ne602in my k2 kit
is it possible to use ne612an instead of the smd
GM,
I am trying to get my K3 - KAT500 combination (which works well alone)
to accept the addition of a XV144 (which works well with the K3 alone).
Having to plug and unplug control cables to switch from HF to VHF is a
non-starter. I had hoped to pick of the control for the XV144 from the
hi,there is an smd replacement for u1 ne602in my k2 kit
is it possible to use ne612an instead of the smd fixture
carlos
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Tnx Charlie
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