[Milsurplus] PP-4763 wows (correction)

Tue Feb 16 18:11:43 EST 2021

Oops! Regarding my previous message below...
I meant the diodes have to be replaced, not transistors in my PP-1104... I'm so used to pass transistors in linear power supplies, that I typed it automatically... it has 10 stud mount rectifier diodes.

Sorry!

73, Meir WF2U
Landrum, SC

----------

On Feb 16, 2021, 12:45 PM, at 12:45 PM, Meir Ben-Dror WF2U <wf2u at ws19ops.com> wrote:
>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
>>
>>
>>
>>
>>
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