From: n4pz(a)live.com
To: captcurt(a)flash.net
Subject: THE FINAL ANSWER ON HV SWITCHING.
Date: Wed, 1 Jun 2011 13:34:50 -0500
I am running two amplifiers from the same HV supply.
Both are grounded grid home brew amps with the grid grounded to the chassis and the cathode floating.
I must switch the B+ because even though the heater is off on one amp, the existing bias circuitry in the OFF amp interferes with the ON amp.
I use a small vacume relay to do the HV switching.
If all amplifiers have chassis ground for the cathode you should be able to leave all HV cables connected and just turn off the heaters.
If you have a mix of the two then GOOD LUCK.
73
Steve N4PZ
> Date: Wed, 1 Jun 2011 10:41:58 -0400
> From: cptcurt(a)flash.net
> To: moon-net(a)mailman.pe1itr.com
> Subject: [Moon-net] Amp HV Switch or Transfer?
>
> GM All:
>
> Still in process of setting up equipment here and am wondering about
> "sharing" a HV Plate supply with two or three amps.
>
> Is there a reasonable design for a DIY HV transfer switch around? I
> don't really like the idea of manually removing an HV connector and
> moving it. I would prefer that it happen remotely as a relay or
> solenoid operation so it can be properly interlocked.
>
> Or am I just being too cheap. ie bite the bullet and build another HV
> supply?
>
> Thanks for any ideas.
>
> Curt
> KU8L
> _______________________________________________
> Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html
>
Date: Wed, 01 Jun 2011 10:41:58 -0400
From: Curt Nixon <cptcurt(a)flash.net>
Subject: [Moon-net] Amp HV Switch or Transfer?
To: moon-net(a)mailman.pe1itr.com
Message-ID: <4DE64FB6.5060103(a)flash.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
GM All:
Still in process of setting up equipment here and am wondering about
"sharing" a HV Plate supply with two or three amps.
Is there a reasonable design for a DIY HV transfer switch around? I
don't really like the idea of manually removing an HV connector and
moving it. I would prefer that it happen remotely as a relay or
solenoid operation so it can be properly interlocked.
Or am I just being too cheap. ie bite the bullet and build another HV
supply?
Thanks for any ideas.
Curt
KU8L
>>>>
K4VX uses a single plate supply to feed 3 HF RF amplifiers decks with no
issues at all. The HV supplied all 3 at the same time, no switching
involved. The biggest reason he did this was to get 3 amps in one cabinet.
Danny NG9R
One more little thing to consider.....safety.....
When multiple amplifier RF decks are connected to a common HV supply you must be extremely careful when it comes to service or repair of the RF decks as you need to remember they are all hot at the same time.
It's tricky to safely interlock things like this.
73
Fred
N1DPM
Jun 1, 2011 01:40:33 PM, kj9i(a)centurytel.net wrote:
While the appeal of a single power supply seems quite enticing,
consider this. With multiple redundant power supplies, if/when one
fails, you can resolve the root cause/problem in the amp (RF deck) and
keep operating using one of the redundant supplies. That, to me (no
down-time) is worth a lot, especially when there are finite-term
DXpeditions operating from a new country I need.
73,
Dave KJ9I
Quoting "Edward R. Cole" :
> At 06:41 AM 6/1/2011, Curt Nixon wrote:
> >GM All:
> >
> >Still in process of setting up equipment here and am wondering about
> >"sharing" a HV Plate supply with two or three amps.
> >
> >Is there a reasonable design for a DIY HV transfer switch around? I
> >don't really like the idea of manually removing an HV connector and
> >moving it. I would prefer that it happen remotely as a relay or
> >solenoid operation so it can be properly interlocked.
> >
> >Or am I just being too cheap. ie bite the bullet and build another HV
> >supply?
> >
> >Thanks for any ideas.
> >
> >Curt
> >KU8L
> >_______________________________________________
> >Moon-Net posting and subscription instructions are at
> >http://www.nlsa.com/nets/moon-net-help.html
>
_______________________________________________
Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html
While the appeal of a single power supply seems quite enticing,
consider this. With multiple redundant power supplies, if/when one
fails, you can resolve the root cause/problem in the amp (RF deck) and
keep operating using one of the redundant supplies. That, to me (no
down-time) is worth a lot, especially when there are finite-term
DXpeditions operating from a new country I need.
73,
Dave KJ9I
Quoting "Edward R. Cole" <kl7uw(a)acsalaska.net>:
> At 06:41 AM 6/1/2011, Curt Nixon wrote:
> >GM All:
> >
> >Still in process of setting up equipment here and am wondering about
> >"sharing" a HV Plate supply with two or three amps.
> >
> >Is there a reasonable design for a DIY HV transfer switch around? I
> >don't really like the idea of manually removing an HV connector and
> >moving it. I would prefer that it happen remotely as a relay or
> >solenoid operation so it can be properly interlocked.
> >
> >Or am I just being too cheap. ie bite the bullet and build another HV
> >supply?
> >
> >Thanks for any ideas.
> >
> >Curt
> >KU8L
> >_______________________________________________
> >Moon-Net posting and subscription instructions are at
> >http://www.nlsa.com/nets/moon-net-help.html
>
I actually does this with two GS35b's in GG configuration.
One for 50 MHz and the other for 432 MHz. Regarding DC the two PA's are
in parallel i.e both grids are bolted to ground, the plates are connected
to the same HV through their anode circuits, and both catodes are
connected together through their catode chokes. Both have their own HF in
and output connectors.
I select the one to run by switching the heater on. ***** ONLY ONE HEATER
ON AT A TIME*****
Have been running this PA for more than 5 years now with sufficient
output - no degradation ever recognized yet.
Great way to use one HV-PS for more PA's.
73 de OZ5TG, Vern
----- Original Message -----
From: "Bill Dzurilla" <billdz.geo(a)yahoo.com>
To: <moon-net(a)mailman.pe1itr.com>; <captcurt(a)flash.net>
Sent: Wednesday, June 01, 2011 6:36 PM
Subject: Re: [Moon-net] Amp HV Switch or Transfer?
Have not tried it, but I knew a guy who had 2 GS-35b amps hooked to a
single
p/s. He simply put 2 HV connectors on the back of his p/s. One cable runs
from one of the HV connectors to one amp, and another cable runs from the
second HV connector to the second amp. One of the 2 amps is always turned
off. The presence of HV does not appear to bother the "off" amp.
73, Bill NZ5N
--- On Wed, 6/1/11, Curt Nixon <cptcurt(a)flash.net> wrote:
> From: Curt Nixon <cptcurt(a)flash.net>
> Subject: [Moon-net] Amp HV Switch or Transfer?
> To: moon-net(a)mailman.pe1itr.com
> Date: Wednesday, June 1, 2011, 10:41 AM
> GM All:
>
> Still in process of setting up equipment here and am
> wondering about
> "sharing" a HV Plate supply with two or three amps.
>
> Is there a reasonable design for a DIY HV transfer switch
> around? I
> don't really like the idea of manually removing an HV
> connector and
> moving it. I would prefer that it happen remotely as
> a relay or
> solenoid operation so it can be properly interlocked.
>
> Or am I just being too cheap. ie bite the bullet and build
> another HV
> supply?
>
> Thanks for any ideas.
>
> Curt
> KU8L
> _______________________________________________
> Moon-Net posting and subscription instructions are at
> http://www.nlsa.com/nets/moon-net-help.html
>
>
_______________________________________________
Moon-Net posting and subscription instructions are at
http://www.nlsa.com/nets/moon-net-help.html
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