Topics

K3 supply voltages

KE1F Lou
 


I accidentally discovered the supply voltage display on my K3.

The K3 is run from a DM330MV regulated power supply.

10 watts tune mode
Rx voltage 13.7V
Tx voltage 13.3V
Voltage drop 0.4V

100 watts tune mode
Rx voltage 13.7 V
Tx voltage 12.3 V
Voltage drop 1.4V

Is such voltage drop normal?
What is normal?

73 Lou KE1F 


Sent from my Galaxy Tab® A

Richard Smith
 

There was a long discussion on voltage drop month or so ago.  Short answer 1.4 bad.  Per discussion, I adjusted my PS to 14.4 volts, shorted and direct connected power cord to power supply, getting rid of DC Anderson distribution hub.  Now K3S read 14.4, drops to 14.1.    Someone may be able to point you to the thread.

RAS

On Apr 24, 2020, at 11:38 AM, KE1F Lou <lmecseri@...> wrote:


I accidentally discovered the supply voltage display on my K3.

The K3 is run from a DM330MV regulated power supply.

10 watts tune mode
Rx voltage 13.7V
Tx voltage 13.3V
Voltage drop 0.4V

100 watts tune mode
Rx voltage 13.7 V
Tx voltage 12.3 V
Voltage drop 1.4V

Is such voltage drop normal?
What is normal?

73 Lou KE1F 


Sent from my Galaxy Tab® A

K9MA
 

12.3 at 100W is definitely too low.

73,
Scott K9MA


On 4/24/2020 11:48, Richard Smith wrote:
There was a long discussion on voltage drop month or so ago.  Short answer 1.4 bad.  Per discussion, I adjusted my PS to 14.4 volts, shorted and direct connected power cord to power supply, getting rid of DC Anderson distribution hub.  Now K3S read 14.4, drops to 14.1.    Someone may be able to point you to the thread.

RAS

On Apr 24, 2020, at 11:38 AM, KE1F Lou <lmecseri@...> wrote:


I accidentally discovered the supply voltage display on my K3.

The K3 is run from a DM330MV regulated power supply.

10 watts tune mode
Rx voltage 13.7V
Tx voltage 13.3V
Voltage drop 0.4V

100 watts tune mode
Rx voltage 13.7 V
Tx voltage 12.3 V
Voltage drop 1.4V

Is such voltage drop normal?
What is normal?

73 Lou KE1F 


Sent from my Galaxy Tab® A


-- 
Scott  K9MA

k9ma@...

David G3YYD
 

Yes. Many turn the PSU up to 14.4volts.

73 David G3YYD 

On 24 Apr 2020 17:38, KE1F Lou <lmecseri@...> wrote:

I accidentally discovered the supply voltage display on my K3.

The K3 is run from a DM330MV regulated power supply.

10 watts tune mode
Rx voltage 13.7V
Tx voltage 13.3V
Voltage drop 0.4V

100 watts tune mode
Rx voltage 13.7 V
Tx voltage 12.3 V
Voltage drop 1.4V

Is such voltage drop normal?
What is normal?

73 Lou KE1F 


Sent from my Galaxy Tab® A

Ray Maxfield
 

Check the Wiring to the power Supply,

Use as large a Wire you can find in your Junk box.

#12, or #10….. if it is over 3 ft long.

Make sure your Power Supply is Rated to 20 Amps

For Voice Peaks / Power.    WA6VAB  K3 #3824

 

 

From: David G3YYD via groups.io
Sent: Friday, April 24, 2020 10:46 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

Yes. Many turn the PSU up to 14.4volts.

 

73 David G3YYD 

 

On 24 Apr 2020 17:38, KE1F Lou <lmecseri@...> wrote:

 

I accidentally discovered the supply voltage display on my K3.

 

The K3 is run from a DM330MV regulated power supply.

 

10 watts tune mode

Rx voltage 13.7V

Tx voltage 13.3V

Voltage drop 0.4V

 

100 watts tune mode

Rx voltage 13.7 V

Tx voltage 12.3 V

Voltage drop 1.4V

 

Is such voltage drop normal?

What is normal?

 

73 Lou KE1F 

 

 

Sent from my Galaxy Tab® A

 

 

Ray Maxfield
 

After looking at the manual for Your Power Supply…..

Do Not Use the Banana Plugs for Your Connectors.

They are NOT Rated for that much Current.

MAYBE 5 Amps if you get the Best ones.

Strip and Wrap the Wire All the way Around the Terminals,

Red and Black.    WA6VAB K3 # 3824

 

 

From: Richard Smith
Sent: Friday, April 24, 2020 9:48 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

There was a long discussion on voltage drop month or so ago.  Short answer 1.4 bad.  Per discussion, I adjusted my PS to 14.4 volts, shorted and direct connected power cord to power supply, getting rid of DC Anderson distribution hub.  Now K3S read 14.4, drops to 14.1.    Someone may be able to point you to the thread.

 

RAS



On Apr 24, 2020, at 11:38 AM, KE1F Lou <lmecseri@...> wrote:

 

 

I accidentally discovered the supply voltage display on my K3.

 

The K3 is run from a DM330MV regulated power supply.

 

10 watts tune mode

Rx voltage 13.7V

Tx voltage 13.3V

Voltage drop 0.4V

 

100 watts tune mode

Rx voltage 13.7 V

Tx voltage 12.3 V

Voltage drop 1.4V

 

Is such voltage drop normal?

What is normal?

 

73 Lou KE1F 

 

 

Sent from my Galaxy Tab® A

 

 

Clay Autery
 

Personally, I would consider that an entirely unacceptable voltage drop.  Though it is within the operational capability of the radio, it will affect efficiency of transmit.

It could be any number of issues....  bad regulation in the PSU.  DC wire between radio and PSU too long and/or too small of a gauge...  Too much total load on the PSU, etc, etc....

Lots of discussions on this topic in the Elecraft Reflector archives.... don't know about here.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 04/24/20 11:38, KE1F Lou wrote:


I accidentally discovered the supply voltage display on my K3.

The K3 is run from a DM330MV regulated power supply.

10 watts tune mode
Rx voltage 13.7V
Tx voltage 13.3V
Voltage drop 0.4V

100 watts tune mode
Rx voltage 13.7 V
Tx voltage 12.3 V
Voltage drop 1.4V

Is such voltage drop normal?
What is normal?

73 Lou KE1F
_._,_._,_

Adrian Fewster <vk4tux@...>
 

I have always run (many years) my Elecrafts at 15.6v .Volt drop while TX at ~15.1v or better, without issue.

Make's for a much cleaner TX signal specially with amp use. Just keep it under 16v.

If your cable supply is good enough you shouldn't see more than 0.5v volt drop


Adrian Fewster


vk4tux

On 25/4/20 3:46 am, David G3YYD via groups.io wrote:
Yes. Many turn the PSU up to 14.4volts.

K9MA
 

On 4/24/2020 15:41, Adrian Fewster wrote:
I have always run (many years) my Elecrafts at 15.6v .

There are a couple 15 V zener diodes across the supply line to provide protection (BZW50-15). They are specified to conduct less than 1 mA at 16.6 V, so 15.6 should be safe. However, Elecraft specifies 15.0 max.

73,

Scott K9MA

-- 
Scott  K9MA

k9ma@...

Steve
 

My bet is loss is due to excessive length of your power supply cable.  I found the supplied Elecraft cable had too much loss.  After cutting the length in half and securely connecting directly to the P/S large rear terminals the voltage loss was cut in half.

Bruce Prior
 

My problem is the finicky Anderson Powerpole connectors, which are far too loose. I commented about the problem in my QST review of the K3 in the April 2008 issue. See page 45 of my otherwise stellar review.
73,
Bruce Prior N7RR

Ray Maxfield
 

Remove ALL other Connectors and Wire Direct to the K3.

Get another power supply for the other stuff,

then you can the  Anderson Poles.   KISS.   

-  WA6VAB   

 

Sent from Mail for Windows 10

 

From: Bruce Prior
Sent: Monday, April 27, 2020 9:46 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

My problem is the finicky Anderson Powerpole connectors, which are far too loose. I commented about the problem in my QST review of the K3 in the April 2008 issue. See page 45 of my otherwise stellar review.

73,

Bruce Prior N7RR

 

Alan Baker
 

If you're having problems with Anderson Powerpoles, then they've been incorrectly fitted, or are fakes.

They do NOT need soldering, unless it's to a PCB. Crimping is actually more reliable than soldering, provided that the approved crimp tool is used.

Elecraft use the correct tools to fit Powerpoles to cables that they supply. Others may not.

All of the issues I've ever seen with Powerpoles is either badly fitted crimps (usually a cheap crimp tool used), the wrong tab for the cable and shell, or counterfeit powerpoles.

73,

Alan. G4GNX


------ Original Message ------
From: "Bruce Prior" <n7rr@...>
Sent: 27/04/2020 17:46:20
Subject: Re: [Elecraft-K3] K3 supply voltages

My problem is the finicky Anderson Powerpole connectors, which are far too loose. I commented about the problem in my QST review of the K3 in the April 2008 issue. See page 45 of my otherwise stellar review.
73,
Bruce Prior N7RR
_.

David Ferrington, M0XDF
 

I second that, everything 12v in my shack etc is APP. only if it has an adapter that goes in a ‘cigar’ socket does in not. 

-73 de M0XDF

On 27 Apr 2020, at 18:49, Alan Baker <g4gnx@...> wrote:


If you're having problems with Anderson Powerpoles, then they've been incorrectly fitted, or are fakes.

They do NOT need soldering, unless it's to a PCB. Crimping is actually more reliable than soldering, provided that the approved crimp tool is used.

Elecraft use the correct tools to fit Powerpoles to cables that they supply. Others may not.

All of the issues I've ever seen with Powerpoles is either badly fitted crimps (usually a cheap crimp tool used), the wrong tab for the cable and shell, or counterfeit powerpoles.

73,

Alan. G4GNX


------ Original Message ------
From: "Bruce Prior" <n7rr@...>
Sent: 27/04/2020 17:46:20
Subject: Re: [Elecraft-K3] K3 supply voltages

My problem is the finicky Anderson Powerpole connectors, which are far too loose. I commented about the problem in my QST review of the K3 in the April 2008 issue. See page 45 of my otherwise stellar review.
73,
Bruce Prior N7RR
_.

Petr Ourednik
 

Bruce,

is it possible to download this article somewhere for non-subscribers please?

--
73 - Petr, OK1RP
--
B: http://goo.gl/Fd2JhJ
MeWe: https://bit.ly/2HGPoDx
MeWe: https://bit.ly/2FmwvDt
--
What could be easier..? ¯‍∖‍_‍(‍ツ‍)‍_‍/‍¯

Lyn Norstad
 

I have replaced several troublesome APP connectors with these, and have had zero failures:

<https://www.amazon.com/MCIGICM-Upgrade-Female-Bullet-Connectors/dp/B07Q2SJSZ1?ref_=ast_sto_dp>

 

73

Lyn, W0LEN

 

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Bruce Prior
Sent: Monday, April 27, 2020 11:46 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

My problem is the finicky Anderson Powerpole connectors, which are far too loose. I commented about the problem in my QST review of the K3 in the April 2008 issue. See page 45 of my otherwise stellar review.

73,

Bruce Prior N7RR

Charlie T, k3ICH
 

Very nice, re-usable and relatively cheap connector, Lyn.

Sure wish they were the standard instead of those one shot, (deleted expletive)  A-P’s !

 

73, Charlie k3ICH

 

 

 

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Lyn Norstad
Sent: Tuesday, April 28, 2020 9:39 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

I have replaced several troublesome APP connectors with these, and have had zero failures:

<https://www.amazon.com/MCIGICM-Upgrade-Female-Bullet-Connectors/dp/B07Q2SJSZ1?ref_=ast_sto_dp>

 

73

Lyn, W0LEN

 

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Bruce Prior
Sent: Monday, April 27, 2020 11:46 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

My problem is the finicky Anderson Powerpole connectors, which are far too loose. I commented about the problem in my QST review of the K3 in the April 2008 issue. See page 45 of my otherwise stellar review.

73,

Bruce Prior N7RR

Lyn Norstad
 

Charlie –

 

I made the (not so hard) decision that the only ‘standard’ I need is MY standard.

 

73

Lyn, W0LEN

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Charlie T, k3ICH
Sent: Tuesday, April 28, 2020 9:43 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

Very nice, re-usable and relatively cheap connector, Lyn.

Sure wish they were the standard instead of those one shot, (deleted expletive)  A-P’s !

 

73, Charlie k3ICH

 

 

 

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Lyn Norstad
Sent: Tuesday, April 28, 2020 9:39 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

I have replaced several troublesome APP connectors with these, and have had zero failures:

<https://www.amazon.com/MCIGICM-Upgrade-Female-Bullet-Connectors/dp/B07Q2SJSZ1?ref_=ast_sto_dp>

 

73

Lyn, W0LEN

 

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Bruce Prior
Sent: Monday, April 27, 2020 11:46 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

My problem is the finicky Anderson Powerpole connectors, which are far too loose. I commented about the problem in my QST review of the K3 in the April 2008 issue. See page 45 of my otherwise stellar review.

73,

Bruce Prior N7RR

QUENTIN COLLIER
 

I've also used these connectors (but not on my K3) and find them robust, reliable and good value for money.


73, Quin G3WRR


On Tuesday, 28 April 2020, 14:39:28 BST, Lyn Norstad <lyn@...> wrote:


I have replaced several troublesome APP connectors with these, and have had zero failures:

<https://www.amazon.com/MCIGICM-Upgrade-Female-Bullet-Connectors/dp/B07Q2SJSZ1?ref_=ast_sto_dp>

 

73

Lyn, W0LEN

 

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Bruce Prior
Sent: Monday, April 27, 2020 11:46 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3 supply voltages

 

My problem is the finicky Anderson Powerpole connectors, which are far too loose. I commented about the problem in my QST review of the K3 in the April 2008 issue. See page 45 of my otherwise stellar review.

73,

Bruce Prior N7RR

Bruce Prior
 

My K3 is S/N 00158, as stated in my QST review. The power cable came with the radio. Is it possible that very early on, Elecraft did not crimp its Anderson Powerpole connectors? The problem is that there is very little friction to hold the connectors reliably attached to the K3. They slip out far too easily.
73,
Bruce Prior N7RR