As I run my K3 from batteries at home, and am about to run in
from batteries in Sierra county for the California QSO party --
no generators permitted where we are. I need battery power for
my normal operations. If higher voltages are needed to clean up
the amp, how about a DC to DC converter.
I tried this a couple of times with my K3S. Didn't notice any
difference between the tuner active and tuner bypassed.
Tuner insertion loss is in the order of 1.0 dB or less when matched,
depending on which side of 50 ohms it is required to match. Very low Z
matches tend to show a bit more lo
I only tuned enough to not be on top of the station.
On October 2, 2015 10:40:28 PM EDT, Bob McGraw - K4TAX
wrote:
>If I understand this correctly. It seems you set / tuned the ATU for
>a
>higher frequency, being the 2nd frequency where you listened, then
>moved
>back down band with out ret
If I understand this correctly. It seems you set / tuned the ATU for a
higher frequency, being the 2nd frequency where you listened, then moved
back down band with out retuning. It would seem then the ATU would be
set for some frequency other than the one you were receiving. Yes,
going to b
Any other folks out there crazy enough to run QRP mobile with their K1s?
Looking for skeds with you and or competitors in a K1 mobile QRP challenge
within this year's CW Sweepstakes. (No I don't run CW SS while driving, not
that crazy). But I did run up about 75 sections and 150 QSOs on 40 an
We're hitting the posting limit on this one. Let's wind it down in the next 3-4
posts at most. Then thread closed for now.
Eric
/elecraft.com/
On 10/2/2015 4:32 PM, Joe Subich, W4TV wrote:
Doing so reduces any IR drop on power supply wiring by a factor of 2
or 3.
Higher voltage - 24 or 40
Doing so reduces any IR drop on power supply wiring by a factor of 2
or 3.
Higher voltage - 24 or 40 V results in decreasing the voltage drop by a
factor or 4 or 9. The voltage drop is a function of current *squared*.
24 or 48 volt finals certainly produce much cleaner signals as the
active
I try to send at around 18 wpm because I am reasonably confident copying
at that speed. I am finding that many who are sending CW do not slow
down, but that's another story.
I use the decode on my KX3 to help my lack of perfect copying, trying to
copy myself and using that to not annoy the other
Right! You want only ONE key line. Note that in Figure 3 (pg 13) the
KPAK3AUX cable contains a key line inside of it. Figure 4 (page 14) show an
external key line cable between the K3 and KPA500 so you can break into it
to control some external gear such as a Stepp-IR antenna controller, but
also s
Brain yes I recall tubes and the multiple power supply requirements. I even
designed to a few. I also remember how rough it was to do mobile power supplies
where the HV came from either vibrators or dynamotors. Then it was transistors
and everything went to 13.85V. But transistor output tanks we
Hi Paul,
Thank you for the suggestion, but respectfully, I am not sure I want to
take such a brut force fix for this, as I have many prams set, that are
not at default. Does this reset everything in the radio to factory?
I want to understand what is happening before I make changes...
--
Thanks
To me the real solution is to incorporate an internal power supply. I
agree that higher PA voltages will produce cleaner transmitters.
Therefore multiple voltages, no problem, minimized ground loop issues,
reduce number of cables. Only one box to transport as opposed to two.
No extra cables
Fred et al:
I would agree. When used with decent power cables, good connectors
properly applied and overall length of 4 ft or so, remote sensing will
likely bring more issues to the table than necessary. Additional wiring,
additional connectors and filtering required to keep RF out and the
o
Fred,
I'm a fan of higher voltage -- perhaps 24 or 40 volts so that PA
transistors can produce cleaner signals. Doing so reduces any IR drop
on power supply wiring by a factor of 2 or 3. KISS.
IC's are going to lower and lower voltages. Multiple circuits within
boxes require a menagerie
I finally found out the answer. In checking the AuxBus cables, I found a
cable connecting the K3 Key Out to the KPA500 PA Key. Removing this cable
made the fault go away. Perhaps I had followed the Figure 3 on page 23 of
the KPA500 manual at some point. Anyway there is a lot of cabling back
there.
Joe, I am familiar with Kelvin sensing, otherwise known as 4 wire or remote
sensing. Its advantages are probably outweighed by the risks of misconnecting
and filtering needed for RF environments. With <4 feet of 10 ga wire I don't
see significant voltage drops. I prefer KISS.
73
Fred, AE6QL
---
On 10/2/2015 12:33 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
The SS30DV has +/- bolt terminals on the rear. The K3S is supplied
with a power cable using ring lugs for these bolts on one end, and an
APP connector for the K3S on the other.
Very good! How about remote sensing terminals/connector
I was playing with my K3S listening to code on 40m. I could clearly hear the
signal but it wasn't loud. I spun the dial up a good bit and listened,
nothing heard after about a minute so I pressed ATU Tune. The ATU clicked a
few times and stopped. I spun back down where I was (somewhere around
7.033
Looking for used KAT3. Anyone upgraded to KAT3A and selling their KAT3?
Let me know what price you’re asking.
Thanks
Pete WK8S
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net
Doug,
The bandspread of the K1 can be easily changed by changing the value of
RF Board C2. The 68pF and the 120pF capacitors are provided with the
kit, but if you want to customize the bandspread, you are free to use
whatever value capacitor at C2 that you desire - 100pF will give you
about
K1 Fanatics,
The K1 can apparently be set to have a band spread of 80 kHz or 150. Can this
choice be easily reversed if I wanted to see (aka "experience") the difference
in operation?
Secondly, as the tuning rate increases with the wider band spread, can that be
tamed by going to a different
Thanks all and Eric for the feedback
73,
Jorge
CX6VM/CW5W
-Mensaje original-
De: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net]
En nombre de Eric Swartz - WA6HHQ, Elecraft
Enviado el: viernes, 02 de octubre de 2015 01:34 p.m.
Para: Joe Subich, W4TV; elecraft@m
First from your description, you may have RF getting into the transmit
audio. This will sound like distortion and will get worse as the CMP
value is increased.
I use a Heil PR 781 mike which is a dynamic mike and has much lower
output level than the Kenwood MC-43.I run with mike gain such
The SS30DV has +/- bolt terminals on the rear. The K3S is supplied with a power
cable using ring lugs for these bolts on one end, and an APP connector for the
K3S on the other.
One other note, at the 100W operating level, we do not see any significant
voltage drop across the APP conn.
73,
E
I have similar spur issues, approx 30khz apart, with the SS30DV on 40 & 80
meters as well. I do not get any noise from my Samlex 1235M using the same
power cabling and same installation location. I will try the suggested toroid
solution to see if I can get rid of the spurs. I do prefer the
I prefer a PS with black and red connectors so I can connect any
cable and don´t worry about connectors.
Quality *bolt* terminals will generally show less voltage drop in
transmit than the wiping contacts like PowerPole connectors. That
is particularly true when the PowerPoles are not assembl
We had spurs all over the 80 meter band here on the K3S station that is being
run as a remote, approximately 30 khz apart. The main station 50 ft away (but
on different antennas spaced 100 feet) had no noise. At first we suspected the
OCF dipole, then the networking boxes, then the laptop. P
I didn't much like the Euro-style clamping terminals either. I built
a short pigtail to 30A APP, and just leave the terminals alone.
They're not robust enough for constant plugging in/out.
The Samlex here is powered 100% of the time. Its output goes to a
solar charge controller used to maintain
Hello Matt
Thanks for the Info.
I have two SEC-1235M and I hate the terminal screws, I think they are
aluminum and I broke them if removing power cable too much times
I prefer a PS with black and red connectors so I can connect any cable and
don´t worry about connectors.
Thanks!
Jorge
CX6VM/CW
Hi Jorge,
I have both power supplies here - SS30DV and the Samlex SEC1235M.
Except for the 1235 having voltage and current meters (the SS30 does
not), there is little difference in performance. One thing that might
affect your decision is that the 1235 has an (internally) adjustable
output volt
I just got mine with my K3S and haven’t even noticed it other than the power
lamp being on. No issues or power drops at full power out.
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jorge Diez - CX6VM
Sent: Friday, Octob
Don —
I have just had a back-and-forth with Elecraft Parts about the same
question.
The K2 Manual, dated March 2012, lists for C44, C46, C32, and C34 trimmers
p/n E540001, 5-30pF. However, Revision I-3 dated September 1, 2015, lists
for C32 and C34 p/n E540002, 10-50 pF; and for C44 and C46,
I entered the CW contest last year and enjoyed the challenge of working OC
entrants with QRP power -- they added a QRP category in 2014 so, if time
permits, get on and participate.72 de Jim R. K9JWV
From: i...@oceaniadxcontest.com
To: i...@oceaniadxcontest.com
CC: oceania...@yahoogroups
Andrew,
C21 and C23 are good with the ceramic capacitors with the red dot - use
those supplied with your kit.
C32 and C34 need approximately 25 pF to tune, and your current brown
trimmers should do the job nicely.
For C44 and C46 the capacity needed is approximately 10 pF (the brown
body trimm
Hello
I will appreciate feedback from users of the SS30DV power supply with a K3
Are you happy with it? With full power on the K3, the SS30DV is running
comfortable? IS noisy?
If you compare for example with a Samlex SEC-1235M, what do you think?
Thanks very much
73,
Jorge
CX
During initial build I didn't have a signal generator and wasn't happy with the
band-pass filter alignment for the 12m and 17m bands which use trimcaps.
Revisiting the alignment with a newly acquired signal generator I found I
couldn't get a correct adjustment and removed C46 - it's maximum value
3 dB?
I've seen an S unit described as 6 dB -- double the *voltage*, or four
times the power. Or in recent years some radios do 5 dB -- keep a linear
string of LED's where over S9 is in 5 dB increments and below S9 is in 5 dB
S units.
Your assertion is the first time I have ever heard an S unit d
37 matches
Mail list logo
