Re: [Elecraft] Astron VS-35M Powwer Supply V-

John, I can't speak for all of them, but the Astron RS-35A linear that I am using to power my K3 includes a "crowbar" over voltage protection circuit across the output. 73, Bill - NA5DX On 4/17/2018 10:37 AM, j...@kk9a.com wrote: Do Astron linear power supplies have protection against

[Elecraft] Astron VS-35M Powwer Supply V-

Do Astron linear power supplies have protection against excessive voltage should the regulator fail? John KK9A __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm

Re: [Elecraft] Astron VS-35M Powwer Supply V-

I believe his point was that a fat and skinny cable in series provides the same net resistance regardless of the ordering of the pieces. Not that a real world cable would be 100 ohms. 73 Josh W6XU On 4/12/2018 9:55 AM, Joe Subich, W4TV wrote: > Running a heavy power supply line with a

Re: [Elecraft] Astron VS-35M Powwer Supply V-

elecraft-boun...@mailman.qth.net> On Behalf Of James Wilson Sent: Thursday, April 12, 2018 11:19 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Astron VS-35M Powwer Supply V- Buck, Running a heavy power supply line with a lighter gauge wire at the radio end OR a lighter wire at the

Re: [Elecraft] Astron VS-35M Powwer Supply V-

I run all my 12v equipment (almost anyway) on a 50A Astron PS. Since the PS is rack-mounted in a half-height cabinet the dc cable is about 12-foot long, so I used #4 welding cable that terminates on a 30A Fuse holder. That feeds two HD barrier strip terminal blocks (for pos and neg rails).

Re: [Elecraft] Astron VS-35M Powwer Supply V-

On 4/12/2018 10:07 AM, Walter Underwood wrote: Cat 5 cable has a different twist on each set of pairs. Those range from 52 to 72 turns per meter or 1.94 to 1.38 cm per turn. That works out to 15 to 22 turns per foot. Yes. This is done to minimize inductively coupled crosstalk between pairs,

[Elecraft] Astron VS-35M Powwer Supply V-

That is some lossy wire in your example:) The reason for the lighter gauge splice suggestion was to provide a way to connect heavy wire to the Elecraft K3 and K3S. I can directly connect 1 awg wire to my Astron power supply but technically only 10 awg to the small PowerPole connector on the

Re: [Elecraft] Astron VS-35M Powwer Supply V-

Cat 5 cable has a different twist on each set of pairs. Those range from 52 to 72 turns per meter or 1.94 to 1.38 cm per turn. That works out to 15 to 22 turns per foot. https://en.wikipedia.org/wiki/Category_5_cable#Individual_twist_lengths wunder K6WRU Walter Underwood CM87wj

Re: [Elecraft] Astron VS-35M Powwer Supply V-

> Running a heavy power supply line with a lighter gauge wire at > the radio end OR a lighter wire at the power supply end, the > overall net supply resistance (and voltage drop) will be the same. > For example, 100 Ohms in series with 1 Ohm equals 101 Ohms net total > resistance. Use

Re: [Elecraft] Astron VS-35M Powwer Supply V-

On 4/12/2018 4:04 AM, j...@kk9a.com wrote: How much power cable twist is needed to be effective for reducing RFI/EMI? More is better. :)  I put black and white #10 in a vise on one end and a drill motor on the other and twist it a lot, then let it sit overnight so that it will at least

Re: [Elecraft] Astron VS-35M Powwer Supply V-

Buck, Running a heavy power supply line with a lighter gauge wire at the radio end OR a lighter wire at the power supply end, the overall net supply resistance (and voltage drop) will be the same. For example, 100 Ohms in series with 1 Ohm equals 101 Ohms net total resistance. Likewise 1 Ohm in

[Elecraft] Astron VS-35M Powwer Supply V-

How much power cable twist is needed to be effective for reducing RFI/EMI? John KK9A Jim Brown K9YC wrote: I find #10 to be the largest cable that I can reasonably fit into the 45A insert, so I run twisted pairs of that. 73, Jim K9YC

Re: [Elecraft] Astron VS-35M Powwer Supply V-

On 4/11/2018 9:14 AM, Don Wilhelm wrote: You can splice a short (3 to 4 inches) length of #12 wire to the #8 or #10 wire and it will not have negligible voltage drop due to the short length. Make certain you have a good tight connection at the splice point. Yes, lots of ways to skin this

Re: [Elecraft] Astron VS-35M Powwer Supply V-

This is a one foot cable that goes from the 75 A series to the 45 A series. https://powerwerx.com/powerpole-pp75-to-pp45-adapter wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Apr 11, 2018, at 1:57 PM, j...@kk9a.com wrote: > > I have never seen the

[Elecraft] Astron VS-35M Powwer Supply V-

I have never seen the Powerpole adapter but that seems like and elegant solution. You could even use 6awg wire with that connector if you had a longer power supply/battery cable. John KK9A Phil Kane k2asp wrote: On 4/11/2018 9:14 AM, Don Wilhelm wrote: > John and all, > > You can splice a

Re: [Elecraft] Astron VS-35M Powwer Supply V-

The Kenwood TS590 runs about a foot of 12 ga connected to the power supply and then the rest of the power line is double 12 ga wires to the radio. Could you reverse that and run double wire until right before the power pole and then a short single wire into the radio? That would reduce the

Re: [Elecraft] Astron VS-35M Powwer Supply V-

I just reduced the current demand by driving a KPA500 at all times :-) Wes  N7WS On 4/11/2018 10:45 AM, Phil Kane wrote: On 4/11/2018 9:14 AM, Don Wilhelm wrote: John and all, You can splice a short (3 to 4 inches) length of #12 wire to the #8 or #10 wire and it will not have negligible

Re: [Elecraft] Astron VS-35M Powwer Supply V-

On 4/11/2018 9:14 AM, Don Wilhelm wrote: > John and all, > > You can splice a short (3 to 4 inches) length of #12 wire to the #8 or > #10 wire and it will not have negligible voltage drop due to the short > length. Or use an APP 75A fitting with 8 AWG wire and the APP 75A-30A reducing adapter

Re: [Elecraft] Astron VS-35M Powwer Supply V-

John and all, You can splice a short (3 to 4 inches) length of #12 wire to the #8 or #10 wire and it will not have negligible voltage drop due to the short length. Make certain you have a good tight connection at the splice point. 73, Don W3FPR On 4/11/2018 12:02 PM, j...@kk9a.com wrote:

Re: [Elecraft] Astron VS-35M Powwer Supply V-

This is an option, I just prefer not to splice cables more than necessary. John KK9A Sent via the Samsung Galaxy 7 edge, an AT 4G LTE smartphone. On Wed, Apr 11, 2018 at 12:14 PM, Don Wilhelm wrote: > John and all, > > You can splice a short (3 to 4 inches) length of

[Elecraft] Astron VS-35M Powwer Supply V-

My 70amp Astron has 1/4" lugs and they seem to make a secure connection. Do to my longer lead length (power supply on floor) I used 8ga wire. This was difficult to stuff into the K3S sized PowerPole. Even with the shorter leads that I use on contest expeditions along with a switching power supply

Re: [Elecraft] Astron VS-35M Powwer Supply V-

How can you "Keep all of the transmitter power supply return current confined to the power cable between the rig and the power supply" when there is a path from the PS to the V- input of an accessory, through the case of the accessory, back to the ground bus, to the case of the radio, and from

Re: [Elecraft] Astron VS-35M Powwer Supply V-

But since there may be multiple devices connected to the power supply, and most of them have the V- connected to the case, then in effect there is a path to the radio through all of these connections. How can you "Keep all of the transmitter power supply return current confined to the power

Re: [Elecraft] Astron VS-35M Powwer Supply V-

Hi Joe, You made a comment about "bolted" connections. I hope I understood you correctly, as I now don't feel so bad about using old fashioned screw terminal blocks for all DC power. I feel they provide solid, unmoving, and permanent connections. I do not like the push on Power Poles, as I

Re: [Elecraft] Astron VS-35M Powwer Supply V-

On 4/10/2018 3:21 PM, Jim Brown wrote: > I'm probably the source of this, although W8JI and W4TV have also raised this issue. See comments below. >> Does that negative rail need to be bonded to the chassis? > > No, and in general, it should NOT be bonded. You *DO NOT WANT* the station

Re: [Elecraft] Astron VS-35M Powwer Supply V-

Hi Paul, I'm probably the source of this, although W8JI and W4TV have also raised this issue. See comments below. On 4/10/2018 11:48 AM, paul ecker via Elecraft wrote: I have been working on bonding my station equipment and have come the issue of bonding/RFI fixes to the VS-35M. I have read

[Elecraft] Astron VS-35M Powwer Supply V-

I have been working on bonding my station equipment and have come the issue of bonding/RFI fixes to the VS-35M. I have read that it is suggested to scrape the paint around the green wire from the ac round plug attachment point to the case. But there is also a small black wire that bonds the V-