K3 supply voltages
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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 |
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Richard Smith <ku4nz01@...>
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.
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RAS
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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.
-- Scott K9MA k9ma@... |
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David G3YYD
Yes. Many turn the PSU up to 14.4volts. 73 David G3YYD On 24 Apr 2020 17:38, KE1F Lou <lmecseri@...> wrote:
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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:
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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
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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:
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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.
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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. |
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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@... |
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Steve <99sunset@...>
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. |
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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
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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
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Alan Baker - G4GNX
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
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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.
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-73 de M0XDF On 27 Apr 2020, at 18:49, Alan Baker <g4gnx@...> wrote:
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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)_/¯ |
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Lyn Norstad - W0LEN
I have replaced several troublesome APP connectors with these, and have had zero failures:
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 |
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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:
73 Lyn, W0LEN
From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of 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 |
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Lyn Norstad - W0LEN
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
I have replaced several troublesome APP connectors with these, and have had zero failures:
73 Lyn, W0LEN
From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of 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 |
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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:
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 |
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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
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