Now crank up the voltage output on the power supply to 14.1 Volts. This will
result in a cleaner signal and lower the amp draw, thus reducing the cable
voltage drop slightly (that Ohms Law thingy again).
Enjoy your rig.
ps: I’ve replaced the circuit board in several Astron power supplies rec
yep, OHM's law lives, even after at least 61 years since i first studied it
in preparation for my novice test.
Furthermore, I'm grateful for the outpouring of ideas and suggestions
received here on this forum. I think I have learned enough to convince
myself that I have improved my situation as m
On 2/26/2019 9:37 AM, mjpilgrim wrote:
What I've gleaned to be most useful from your responses has been the
suggestions to investigate the power cord with power poles connecting the K3
to my switching power supply. Per those inputs I've fabricated a shorter
(5') cable and insured that I used the
0.7 V for a regular diode. I believe Elecraft uses Schottky diodes for
protection because of their lower voltage drop (0.15 to 0.45 V).
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Feb 26, 2019, at 11:20 AM, Harlan Sherriff via Elecraft
> wrote:
>
> Diod
Diode voltage drop is approximately 0.7v per diode
Sent from my iPhone
> On Feb 26, 2019, at 2:16 PM, Jack Brindle via Elecraft
> wrote:
>
> Be sure to use a DVM external to the K3 to measure the voltage at the K3. The
> input protection diode in the K3 will cause some drop (1/4 to 1/2 volt
Be sure to use a DVM external to the K3 to measure the voltage at the K3. The
input protection diode in the K3 will cause some drop (1/4 to 1/2 volt
perhaps). What this means is that the K3 meter will always show less voltage
than is really present at the transceiver supply input.
73!
Jack, W6
Well, i have received many helpful replies both publicly here and in private
emails. Thanks to all for those ideas brought forward.
What I've gleaned to be most useful from your responses has been the
suggestions to investigate the power cord with power poles connecting the K3
to my switching pow
John and all,
A 25 amp power supply should adequately power the K3 at 100 watts - but
check the K3 specifications if contemplating 100 watts for DATA modes.
The K3 is rated for ICAS and not for continuous duty.
Also keep in mind that the K3 is a bit different than other amateur
transceivers
There are two adjustments in my Astron 35A supply. One on the board,
adjusts the voltage. Another on the meter, calibrates the meter. I
found my output on the terminals was almost a volt low even though the
meter read full.
I adjusted the pot on the board and then calibrated the meter using
stron-repair/astron-repair.html
73
Frank
W3LPL
- Original Message -
From: "James Walker"
To: donw...@embarqmail.com
Cc: donov...@starpower.net, elecraft@mailman.qth.net
Sent: Monday, February 25, 2019 7:35:49 PM
Subject: Re: [Elecraft] K3/100 Voltage Drop when transmitti
Thanks Don. I’m sure the problem is with with the Astron as you suggest. I’ll
try your suggestions when I’m back at home in “shop mode,”
Jimmy
> On Feb 25, 2019, at 2:30 PM, Don Wilhelm wrote:
>
> Jimmy,
>
> Astron power supplies have a nasty habit of having loose wiring terminals.
> They u
Jimmy,
Astron power supplies have a nasty habit of having loose wiring
terminals. They use only pressure to hold the ring terminals on the
inside to the terminal bolts.
If you can detect even a slight rotation of the bolt when tightening
terminals on the outside, remove the covers and tighten
I had a similar problem. I checked the key-down voltage at my power supply, and
was surprised to see that it was low (I don't recall the exact voltage).I'm
using an Astron linear power supply. I replaced the voltage regulator in the
power supply, and the problem was solved.73,Don Sayler W7OXRSen
I have a K3 that behaves similarly to what Mike described. I switched from an
Astron 25 amp (15 years or more old) power supply to a switching power supply.
Problem solved. One would think the problem was my Astron power supply, but I
don’t see any such power drop when I use my Astron with other
Hi Mike,
What are your voltage readings at the power supply end of your
six foot power cords?
None of my K3s do behave the way you describe.
73
Frank
W3LPL
- Original Message -
From: "mjpilgrim"
To: elecraft@mailman.qth.net
Sent: Monday, February 25, 2019 6:55:01 PM
Sub
15 matches
Mail list logo
