[Milsurplus] PP-4763 wows

Tue Feb 16 12:44:24 EST 2021

Ray,

I used the T-195 with both the LV and HV dynamotors with the PP-1104 with no problems. The meter pegs at the start-up but the dynos spin up normally, and settles at around 35 amps. Some time ago the PP-1104 died in the middle of a local AM net using it with an ART-13/BC-348 (it had no problem with the DY-17 starting current either for years), and I found a couple of  pass transistors bad - all original). I bought the higher current version of the original to replace all of them, but haven't done it yet. In the meantime I bought (eBay) a couple of the more modern PP-8474/G switching power supplies - in comparison they weigh 35 lbs; they're adjustable 22 to 30 volts DC @ 60 amps. These supplies are completely RFI free.
They do fine with the T-195 dynamotors, the ammeter pegs for a fraction of a second and settles at 35 amps, that includes the R-392 current. I haven't tried the ART-13/DY-17 yet with these. My PP-4763 is powering the GRC-106 in my GRC-122 shelter. I haven't tried to use it with anything else. On the other hand, I used a PP-8474 to power the GRC-106 while the 4763 was down several months ago when the 3 original electrolytic caps on the control board failed at the same time, and I had to order replacements as I didn't have those values in my stock of parts.
I also have a T-195B with the two inverter supplies, I run that and the R-392 with a 35 amp surplus Lambda RFI proof switching supply.

73, Meir WF2U
Landrum, SC

⁣Get BlueMail for Android 

On Feb 16, 2021, 11:27 AM, at 11:27 AM, Ray Fantini <rafantini at salisbury.edu> wrote:
>Cool, been operating from 120 but have a 220 volt outlet in the shop
>and will look at converting over. Figure that at full power the GRC-106
>is sucking down a little over 1 kW  so with the efficiency of the power
>supply and the like probably pulling around 10 amps at 120 volts and
>changing to 220 would cut that by half. Fortunately have a sub panel
>out in the shack that provides a couple dedicated circuits along with a
>220 volt outlet that I was using with my old RCA Broadcast transmitter
>that I had on 160, the only disadvantage would be that when I roll the
>1104 out to the garage to start things like the M151 its convenient to
>plug it into an regular outlet but this may be an excuse to go ahead
>and install 220 volt outlets in the garage being that way maybe the big
>air compressor would be happier?
>Cannot imagine what people with things like the old dynamotor first
>generation T-195 have to do to get them started? Although think they
>only require around 40 amps for operation think the manual says that
>you needed around 250 Amps surge to kick the dynamotors into operation.
>Perhaps the T-195 may be the king of current draw for power output in
>military radios? Wonder what the kick over requirements were for the
>huge dynamotor for things like the ART-13 or BC-191 transmitters?
>
>Ray F/KA3EKH
>
>
>From: Tom <noflood1 at sonic.net>
>Sent: Monday, February 15, 2021 4:07 PM
>To: Ray Fantini <RAFANTINI at salisbury.edu>
>Cc: milsurplus at mailman.qth.net
>Subject: Re: [Milsurplus] PP-4763 wows
>
>
>
>
>My PP-1104 does a good job spinning up the DY-17 Dynamotor for my
>ART-13 but it work much better if wired for 220 than 110.
>
>
>
>                                                                  W6TOM
>Before you do anything to your PP-4763 I have a PP-1104 that’s the
>standard military 12/24 volt power supply that has no issue providing
>high current. Think its rated at 100 amps at 12 volt and 50 amps at 24
>volts. It’s not intelligent, uses a magnetic amplifier that somehow
>controls regulation of the output to within a volt or two between heavy
>and no load and has no issues doing things like starting cars or huge
>dynamotors. The only issue is it weighs 152 Lbs. so it lives on a
>furniture dolly.
>I use it to work on GRC-106 sets and runs them at full power with no
>issue but would be better if I had the proper PP-4763 so would be more
>than willing to do a trade.
>
>
>Ray F/KA3EKH
>
>
>
>
>
>------------------------------------------------------------------------
>
>______________________________________________________________
>Milsurplus mailing list
>Home: http://mailman.qth.net/mailman/listinfo/milsurplus
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Milsurplus at mailman.qth.net
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20210216/beca2e62/attachment.html>