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

[Bill Breeden]

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 excessive voltage
should the regulator fail?

John KK9A



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

[j...@kk9a.com]

Do Astron linear power supplies have protection against excessive voltage
should the regulator fail?

John KK9A



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

[Josh Fiden]

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 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 *realistic* resistance values.  For example, a 10 foot piece of
of #8 wire (0.63 milli-Ohms per foot) with a six inch "pigtail" of
#12 wire (1.5 milli-Ohms per foot) is equivalent to 11' 3" of #8
wire or less than one foot of #12 wire.



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

[Charlie T]

You need to deploy the Ohm Eater to get rid of those pesky, excess Ohms

BUT, be carefultheir "droppings" can be toxic to the ruby throated
Ampere.
The hairy clawed Volt is however,  immune.

Charlie k3ICH




-Original Message-
From: elecraft-boun...@mailman.qth.net <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 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 series with 100 Ohms is still 101 Ohms.

It doesn't matter if you take the voltage drop at the input or at the output
end of the power run if the total load is at the end of the run.

I checked with Dr. Ohm to verify this.  :-)

Jim - W4RKS


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

[Edward R Cole]

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).  The terminals accommodate No. 10 awg cables to 
the heaviest current loads.  A secondary strip handles small stuff 
(under 5A total).


The PS runs 13.71v and drops to 13.5v at the fuse holder.  K3 sees 
about 13.35v (radio is 10w version).  I have only two PowerPole 
equipped pieces; the rest use terminals or other connectors like 
Molex, etc. (even one Cinch-Jones).  I count 14 loads connected to 
the 13v power distribution (not all are used simultaneously).


In the case of running to a regular-sized PP connector I just add a 
few inches of no.14 awg (splice is two wires soldered and covered 
with heat shrink)


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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

[Jim Brown]

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, which is critical to Ethernet transmission. A pair from CAT5/6 
cable used to carry audio or RF provides very good rejection of 
differential mode coupling to/from the cable. It's a great choice for 
telephone wiring if RFI to the phone line (including DSL) is a problem. 
A CAT5/6 pair is also a great choice for adding a ferrite common mode 
choke to a low band receive antenna. I've completed a set of 
measurements on this and will publish an applications note in the near 
future.


73, Jim K9YC

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

[j...@kk9a.com]

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
transceiver.

John KK9A


James Wilson w4rks73 wrote:


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 series with 100 Ohms is still 101 Ohms.

It doesn't matter if you take the voltage drop at the input or
at the output end of the power run if the total load is at the
end of the run.

I checked with Dr. Ohm to verify this.  :-)

Jim - W4RKS

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

[Walter Underwood]

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
http://observer.wunderwood.org/ (my blog)

> On Apr 12, 2018, at 9:48 AM, Jim Brown  wrote:
> 
> 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 partially learn its new position. :)  I'd have to look, 
> but I'd guess I'm getting 3-5 turns per foot, and it will vary from one end 
> to the other.
> 
> Note that twisting power conductors only helps prevent coupling to and from 
> those conductors.
> 
> 73, Jim K9YC
> 
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Re: [Elecraft] Astron VS-35M Powwer Supply V-

[Joe Subich, W4TV]

> 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 *realistic* resistance values.  For example, a 10 foot piece of
of #8 wire (0.63 milli-Ohms per foot) with a six inch "pigtail" of
#12 wire (1.5 milli-Ohms per foot) is equivalent to 11' 3" of #8
wire or less than one foot of #12 wire.

The *contact resistance* in a 15A Power Pole (0.88 milli-Ohms) is,
*by itself,* is equivalent to more than six inches of #12 wire.

Ohm's Law is *exactly* why we would all be better off if the power
jack on the K3/K3S was doubled up and the power cable replaced with
#6 or #8 wire even if it were necessary to splice in some 4" pieces
of #10 or #12 wire to mate with the 15A Power Pole connectors.

#10 or 1/4" bolts for the power terminal with #8 wire and ring
terminals on both ends would reduce the voltage drop in the power
cable by 75%, if the bolted connections were torqued properly,
compared to #12 wire and 15A Power Pole connectors.

73,

   ... Joe, W4TV


On 2018-04-12 11:19 AM, James Wilson wrote:

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 series with 100 Ohms is still 101 Ohms.

It doesn't matter if you take the voltage drop at the input or
at the output end of the power run if the total load is at the
end of the run.

I checked with Dr. Ohm to verify this.  :-)

Jim - W4RKS
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Re: [Elecraft] Astron VS-35M Powwer Supply V-

[Jim Brown]

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 partially learn its new position. :)  I'd have 
to look, but I'd guess I'm getting 3-5 turns per foot, and it will vary 
from one end to the other.


Note that twisting power conductors only helps prevent coupling to and 
from those conductors.


73, Jim K9YC

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

[James Wilson]

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 series with 100 Ohms is still 101 Ohms.

It doesn't matter if you take the voltage drop at the input or
at the output end of the power run if the total load is at the
end of the run.

I checked with Dr. Ohm to verify this.  :-)

Jim - W4RKS
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[Elecraft] Astron VS-35M Powwer Supply V-

[j...@kk9a.com]

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


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

[Jim Brown]

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 cat, depending on your needs and 
resources. Several vendors sell adapters with a "big" grey Power Pole 
wired with #12 pairs to four red/black connectors, and it's easy to 
build your own. I find #10 to be the largest cable that I can reasonably 
fit into the 45A insert, so I run twisted pairs of that.


I've seen statements that some of the Power Pole connector boxes have 
undersized circuit traces on the PCB that connects them. I use them only 
for accessories that draw relatively low current.


73, Jim K9YC

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

[Walter Underwood]

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 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 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 (with or without the above-recommended pigtail) to the 30A-size
> fitting on the transceiver (I do that for my K2/100).  The battery and
> power-supply leads to my distribution system, however, are 4 AWG with
> crimped lugs and stud mounts.
> 
> 73 de K2ASP - Phil Kane
> Elecraft K2/100   s/n 5402
> 
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[Elecraft] Astron VS-35M Powwer Supply V-

[j...@kk9a.com]

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 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 (with or without the above-recommended pigtail) to the 30A-size
fitting on the transceiver (I do that for my K2/100).  The battery and
power-supply leads to my distribution system, however, are 4 AWG with
crimped lugs and stud mounts.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

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

[Buck]

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 over-all resistance in the power line and still use the 
single power pole jack on the radio.


My power supply is a 35A Astron and I use the stock Elecraft-supplied 
power line.  My voltage drops at least a half volt on key down.


Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 4/11/2018 12:02 PM, j...@kk9a.com wrote:

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 I found that I need 10ga wire to keep the voltage above 13.5 on TX.
I think that larger PowerPoles or studs would have been nicer for those
interested in keeping the K3S voltage in the desirable range. Double as
Joe suggested would also work if you wanted to run two sets of wires.

John KK9A



Joe Subich, W4TV wrote:


Ohms Law!  If the transceiver power supply cable is short and heavy
guage with multiple contact pins (or #10 - 1/4" bolted terminals)
and #10 or 14" bolted terminals on the power supply, the impedance
of the desired path in the power supply cable will be much, much
less than the path through control cables (#16-#22 wires with
single small pins) and any accessories.

Elecraft/Astron come close with their power supply connection.  I
would appreciate it if the transceiver had bolted connections or
at least double up the power poles and move from #12 to #10 cable.
Doubling up on the power poles would allow using two (#12) cables
further reducing the impedance (and voltage drop) of the desired
path.

73,

 ... Joe, W4TV

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

[Wes Stewart]

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 voltage drop due to the short
length.

Or use an APP 75A fitting with 8 AWG wire and the APP 75A-30A reducing
adapter (with or without the above-recommended pigtail) to the 30A-size
fitting on the transceiver (I do that for my K2/100).  The battery and
power-supply leads to my distribution system, however, are 4 AWG with
crimped lugs and stud mounts.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402



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

[Phil Kane]

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 (with or without the above-recommended pigtail) to the 30A-size
fitting on the transceiver (I do that for my K2/100).  The battery and
power-supply leads to my distribution system, however, are 4 AWG with
crimped lugs and stud mounts.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

>From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon
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Re: [Elecraft] Astron VS-35M Powwer Supply V-

[Don Wilhelm]

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:

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 I found that I need 10ga wire to keep the voltage above 13.5 on TX.
I think that larger PowerPoles or studs would have been nicer for those
interested in keeping the K3S voltage in the desirable range. Double as
Joe suggested would also work if you wanted to run two sets of wires.

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

[j...@kk9a.com]

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 #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:
>
>> 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 I found that I need 10ga wire to keep the voltage above 13.5 on TX.
>> I think that larger PowerPoles or studs would have been nicer for those
>> interested in keeping the K3S voltage in the desirable range. Double as
>> Joe suggested would also work if you wanted to run two sets of wires.
>>
>
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[Elecraft] Astron VS-35M Powwer Supply V-

[j...@kk9a.com]

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 I found that I need 10ga wire to keep the voltage above 13.5 on TX.
I think that larger PowerPoles or studs would have been nicer for those
interested in keeping the K3S voltage in the desirable range. Double as
Joe suggested would also work if you wanted to run two sets of wires.

John KK9A



Joe Subich, W4TV wrote:


Ohms Law!  If the transceiver power supply cable is short and heavy
guage with multiple contact pins (or #10 - 1/4" bolted terminals)
and #10 or 14" bolted terminals on the power supply, the impedance
of the desired path in the power supply cable will be much, much
less than the path through control cables (#16-#22 wires with
single small pins) and any accessories.

Elecraft/Astron come close with their power supply connection.  I
would appreciate it if the transceiver had bolted connections or
at least double up the power poles and move from #12 to #10 cable.
Doubling up on the power poles would allow using two (#12) cables
further reducing the impedance (and voltage drop) of the desired
path.

73,

... Joe, W4TV

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

[Joe Subich, W4TV]

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 there to the V- input of the radio?

Ohms Law!  If the transceiver power supply cable is short and heavy
guage with multiple contact pins (or #10 - 1/4" bolted terminals)
and #10 or 14" bolted terminals on the power supply, the impedance
of the desired path in the power supply cable will be much, much
less than the path through control cables (#16-#22 wires with
single small pins) and any accessories.

Elecraft/Astron come close with their power supply connection.  I
would appreciate it if the transceiver had bolted connections or
at least double up the power poles and move from #12 to #10 cable.
Doubling up on the power poles would allow using two (#12) cables
further reducing the impedance (and voltage drop) of the desired
path.

73,

   ... Joe, W4TV


On 2018-04-11 2:27 AM, Victor Rosenthal 4X6GP wrote:
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 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 there to the V- input of the radio?


Wouldn't it REDUCE the change in the ground reference to bond the V- to 
the bus?


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 11 Apr 2018 00:04, Joe Subich, W4TV wrote:


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 bonding ("ground") and the V- rail to
be interconnected.  If you allow that to happen, particularly at
the transceiver and power supply, the station ground becomes an
alternate return for the high current pulses during transmit.

When the station bonding is allowed to "float" with the high current
pulses any other accessory connected to the bonding (particularly
"linear" bonding) sees a varying ground reference level which
contributes to "RF feedback" as that varying reference "pumps"
(excites) any pin 1 problem in the device.

Keep all of the transmitter power supply return current confined to
the power cable between the rig and the power supply. Make sure all
power supply connections are tight and all power cords as short as
possible.  Always use the largest practical wire for all power cords.
If possible, use twisted pair cables, *bolted* connections (like
on the Astron RS/VS series power supplies) and multiple, parallel
pin connections in any power connectors.

73,

    ... Joe, W4TV


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

[Victor Rosenthal 4X6GP]

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 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 there to the V- input of the radio?


Wouldn't it REDUCE the change in the ground reference to bond the V- to 
the bus?


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 11 Apr 2018 00:04, Joe Subich, W4TV wrote:


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 bonding ("ground") and the V- rail to
be interconnected.  If you allow that to happen, particularly at
the transceiver and power supply, the station ground becomes an
alternate return for the high current pulses during transmit.

When the station bonding is allowed to "float" with the high current
pulses any other accessory connected to the bonding (particularly
"linear" bonding) sees a varying ground reference level which
contributes to "RF feedback" as that varying reference "pumps"
(excites) any pin 1 problem in the device.

Keep all of the transmitter power supply return current confined to
the power cable between the rig and the power supply. Make sure all
power supply connections are tight and all power cords as short as
possible.  Always use the largest practical wire for all power cords.
If possible, use twisted pair cables, *bolted* connections (like
on the Astron RS/VS series power supplies) and multiple, parallel
pin connections in any power connectors.

73,

    ... Joe, W4TV


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

[Bill]

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 
flat do not trust them - too many failures. Many such from merely moving 
a piece of equipment and slightly disturbing the wires. And, yes - I do 
know how to put Power Pole connectors together properly.


Hence, with the exception of the required plugin on the K3 - I do not 
use them any longer. That plugin has a fixed strain relief installed on 
it - in case I move the rig a tenth of an inch.


Bonus: No expensive plugs or tools required!

Bill W2BLC K-Line


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

[Joe Subich, W4TV]

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 bonding ("ground") and the V- rail to
be interconnected.  If you allow that to happen, particularly at
the transceiver and power supply, the station ground becomes an
alternate return for the high current pulses during transmit.

When the station bonding is allowed to "float" with the high current
pulses any other accessory connected to the bonding (particularly
"linear" bonding) sees a varying ground reference level which
contributes to "RF feedback" as that varying reference "pumps"
(excites) any pin 1 problem in the device.

Keep all of the transmitter power supply return current confined to
the power cable between the rig and the power supply. Make sure all
power supply connections are tight and all power cords as short as
possible.  Always use the largest practical wire for all power cords.
If possible, use twisted pair cables, *bolted* connections (like
on the Astron RS/VS series power supplies) and multiple, parallel
pin connections in any power connectors.

73,

   ... Joe, W4TV


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

[Jim Brown]

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 that it is suggested to scrape the 
paint around the green wire from the ac round plug attachment point to the case.


Yes, VERY important.


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?


Yes, IF you want to bond V-.


  Does that negative rail need to be bonded to the chassis?


No, and in general, it should NOT be bonded.

AND proper station bonding is quite important.

Study http://k9yc.com/GroundingAndAudio.pdf  and/or N0AX's new ARRL book 
on the subject, which parallels my work. (My slide show pdf is free.) :)


73, Jim K9YC

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

[paul ecker via Elecraft]

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- terminal to the 
case. Should the paint around that screw also be removed?  Does that negative 
rail need to be bonded to the chassis? 
73Paulkc2nyu
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