Unfortunately, the IMD can be unacceptable even with the supply set to the high
side.
I will confess to not having measured IMD v. supply voltage. For my manual
method, that entails another layer of data. I have however, characterized my
old K3 and my new K3S with three different LPAs and fo
Well, well. The meter on the front of the Astron 35 says 14.5 volts. My
DVM across the output says 13.5. No wonder my front panel reads 13.3 in
receive mode.
Looks like a calibration is in order. I didn't realize they could get
"off." Instructions available on the Internet. You can adjust
I think the original question has morphed. It is really two questions. The
operational range of the K3 as one. The second is really the optimum range of
the K3. In dealing with the drops between the K3 and power supply how much is
excessive? My Astron is set for 14 volt and drops at the K3
K9YC:
>"Joe is right and George is WRONG. V- is NOT GROUND, it is the return for
DC power. Bonding V- to ground is a BAD idea -- that's why virtually all
pro-grade power supplies are built either without the bond or so that the
bond can easily be removed."
And from K2VCO:
>"But I keep coming b
o:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Issue 12 re Astron Power Supply
Message-ID:<9141e52a-a64f-5174-1889-1e31ef365...@sonic.net>
Content-Type: text/plain; charset=utf-8; format=flowed
You're right. If all the devices run from the same 12V power supply and
they are all bonded to
I believe that the transceiver will operate below 11 volts but it is better
to keep it in the higher part of the voltage range. My power supplies are
all 13.8v and I use heavier cables than Elecraft supplied which keeps it
around 13.5v while transmitting.
John KK9A
Buck - K4IA wrote:
What is
Like all of the "12VDC" rigs made today the IMD on the K3 is sensitive
to input voltage. I would recommend you get the input up into the
14.8VDC range as it will reduce the IMD products. I have mine such that
on CW key down 100W the internal K3s voltmeter reads 14.5VDC which is
basically the
The specs are in the manual, which is online as a PDF.
http://www.elecraft.com/K2_Manual_Download_Page.htm
Supply Voltage and Current: 13.8 V nominal (11 V min, 15 V max)
Recommended supply: 13.8VDC @ 25A, continuous duty for K3S/100; 13.8VDC @ 6A
for K3S/10.
Both on page 8.
wunder
K6WRU
Walt
What is the minimum recommended voltage for the K3S? Using the stock
Elecraft 5' cable, I drop from 13.3 to 12.7 volts on key down.
Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com
On 4/16/2018 4:51 PM, Joe Subich, W4TV wrote:
On 2018-04-16 4:26 PM, hawley, charles j jr wrote:
So 4 sets of p
On 4/16/2018 10:39 PM, Alan wrote:
If all the devices run from the same 12V power supply and they are all
bonded together, then there is nothing to prevent some of the
transceiver return current flowing in the negative power supply leads
of the other devices.
That is NOT the problem. Have you
You're right. If all the devices run from the same 12V power supply and
they are all bonded together, then there is nothing to prevent some of
the transceiver return current flowing in the negative power supply
leads of the other devices. Hopefully the transceiver power leads use
much heavier
But I keep coming back to this: almost every device connected to the power
supply has V- connected to ground internally. So if you have, say, a keyer and
a transceiver running off the same supply, won’t some of the transceiver’s
current flow through the V- line to the keyer, to the case of the k
On 2018-04-16 7:17 PM, Don Wilhelm wrote:
> In other words, the total contact resistance of the 8 powerpole
> connectors is not as great as the resistance of 5 feet of #12 wire.
Not according to the specifications.
The specification for contact resistance of a 15A Power Pole is
0.875 milliOhms
From the Powerpole spec sheet.
Avg. Mated Contact Resistance | Milliohms
15A Wire Contact with 5/8” of #16 AWG | 0.875
30A Wire Contact with 5/8” of #12 AWG | 0.600
45A Wire Contact with 5/8” of #10 AWG | 0.525
45A PCB Contact to Contact | 0.500
25A PCB Contact to Contact |
Using a fused Rigrunner to connect from the K3 to a power supply can
cause excessive voltage drop. There are 6 points of contact. The APP
contact to the rigrunner itself (2 contacts, the negative must be
considered as well). There are 2 at the fuse contacts, and there are 2
at the the cable
On 4/16/2018 7:18 AM, Don Wilhelm wrote:
If you are fighting audio noise, hum and buzz problems (now that we
have low level audio stuff in the hamshack) - disconnect that wire AND
bond all enclosures together as K9YC suggests.
Clarification (because of the way the sentence is written) -- I DO
On 2018-04-16 4:26 PM, hawley, charles j jr wrote:
So 4 sets of power pole connectors plus 2 fuses.
Even if the power pole connectors are assembled perfectly and
mated with optimum tension, the resistance in just the four
(15 A) power pole connectors in the negative lead is equivalent
to nearly
Joe is right and George is WRONG. V- is NOT GROUND, it is the return
for DC power. Bonding V- to ground is a BAD idea -- that's why
virtually all pro-grade power supplies are built either without the bond
or so that the bond can easily be removed.
As to those who were confused by my advice -
So the ground path was more direct it seems.
Chuck Jack
KE9UW
Sent from my iPhone, cjack
> On Apr 16, 2018, at 3:27 PM, hawley, charles j jr
> wrote:
>
> About 75% went thru the ground path. The 10 ga to the rig went from Astron to
> a battery switching device in case of power outage, to r
About 75% went thru the ground path. The 10 ga to the rig went from Astron to a
battery switching device in case of power outage, to rig runner and to rig. So
4 sets of power pole connectors plus 2 fuses. I’m thinking of changing some of
that too. The voltage at the rig, K3, now drops a volt whe
I would hope that "much of the current..." wasn't really much. The direct
conductor from the negative terminal of the power supply to the radio should
carry the majority of the supply current,
Wes N7WS
On 4/15/2018 7:38 PM, hawley, charles j jr wrote:
This thread prompted me to check out m
George,
I think you are talking about apples and oranges. Yes, a good ground
rod system is for lightning protection. I have a grounding system in
place at my house with a driven stake at each place where the perimeter
wire connecting them make a 45 degree turn or more. That is also
connect
On 2018-04-16 9:28 AM, George Danner wrote:
> Re-Connect it!
DON'T CONNECT THAT WIRE BETWEEN V- AND CHASSIS CASE!
Unless you have a substantial *EXTERNAL GROUND CONNECTION*
between your station ground and the electrical system ground
rod, that connection between V- and chassis will bridge the
p
can be taken both ways.
73, Charlie k3ICH
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Joe Subich, W4TV
Sent: Monday, April 16, 2018 8:11 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Issue 12 re Astron Power Supply
On 2018-04-15 10:38 PM, hawley,
ire or leaving it in place?
Your comment can be taken both ways.
73, Charlie k3ICH
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Joe Subich, W4TV
Sent: Monday, April 16, 2018 8:11 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Issue 12 re Astron Powe
Re-Connect it!
From a broadcaster (AM,FM & TV) was in South Florida (lightning capital of
North America).
The more massive the common (ground, bonding, whatever term you use) for the
connection between equipment and the power company ground connection the
better.
We even used ring grounds ar
al Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Joe Subich, W4TV
Sent: Monday, April 16, 2018 8:11 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Issue 12 re Astron Power Supply
On 2018-04-15 10:38 PM, hawley, charles j jr wrote:
> I disconnected the black wire
On 2018-04-15 10:38 PM, hawley, charles j jr wrote:
I disconnected the black wire. When it was connected, much of the
current that would have passed thru the negative power wire from the
power supply to the rig was shunted thru the green power cord wire,
the ground buss bar, and other ground co
Thanks for even more clarity, Chuck.
Ed McCann
AG6CX
Sent from my iPhone
> On Apr 15, 2018, at 7:38 PM, hawley, charles j jr
> wrote:
>
> This thread prompted me to check out my Astron vs35m. It had a small black
> wire from -V connected to the bottom of the chassis. Perhaps it could be
> ca
This thread prompted me to check out my Astron vs35m. It had a small black wire
from -V connected to the bottom of the chassis. Perhaps it could be called a
case or cabinet...more importantly, it’s what the green wire from the line cord
is connected to. I disconnected the black wire. When it was
Yes.
And I read he made no distinction between “case” and “chassis”, like the other
respondents.
Or did you catch something I missed?
Much obliged for your prompt response.
73,
AG6CX
Sent from my iPhone
> On Apr 15, 2018, at 6:27 PM, wrote:
>
> Did you read W4TV's post on this subject?
>
Did you read W4TV's post on this subject?
http://mailman.qth.net/pipermail/elecraft/2018-April/255072.html
Edward McCann ag6cx1 wrote:
"But there is also a small black wire that bonds the V- terminal to the
case. Should the paint around that screw also be removed???Does that
negative rail need
32 matches
Mail list logo
