Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

[Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

net> To: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 bon

[Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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 |

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

can be taken both ways. 73, Charlie k3ICH -Original Message- From: elecraft-boun...@mailman.qth.net <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

Re: [Elecraft] Issue 12 re Astron Power Supply

t: 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. 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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

al Message- From: elecraft-boun...@mailman.qth.net <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:

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. 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

Re: [Elecraft] Issue 12 re Astron Power Supply

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.

Re: [Elecraft] Issue 12 re Astron Power Supply

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

Re: [Elecraft] Issue 12 re Astron Power Supply

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

[Elecraft] Issue 12 re Astron Power Supply

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