[Milsurplus] solid state dynamotor
wf2u at ws19ops.com
wf2u at ws19ops.com
Wed Dec 17 16:27:52 EST 2008
That's fine if one wants to run equipment off 110 VAC.
Luckily, I have the original AC supplies for the TCS and the GRC-9, so
I don't have to use the dynamotor supplies.
The Canadian set I mentioned, has built in dynamotors in the receiver
and in the transmitter. My transmitter was missing the dynamotor when
I got it.
The 12 VDC to 115 VDAC converter will fit with room to spare in the
transmitter, and I can squeeze a HV transformer, rectifiers and filter
caps in it as well, keepeng the original cables, appearence and
functionality. They'll be run on 12 VDC as they were designed.
It sounds like the power supplies you mentioned may be useful for
homebrewing projects, saving the effort of building a power supply
from scratch for a 6146 class transmitter...
73, Meir WF2U
Quoting Spike Dennis <spike.dennis at yahoo.com>:
> As has already been noted, the power supplies used on the old GE
> Progress line transceivers work great. I used one to power my TCS
> for years. I also used the supply from a Motorola Motrac to run my
> GRC-9. RCA business band equipment of the same era will work equally
> as well, one of these currently runs my TCS from 110vac. Try to
> find the higher powered versions(2ea 6146 out put tubes). All these
> radios also had table-top base variants that are a good source for
> AC power supplies. Take care, some of these old radios also had
> dyno's in them, or vibrator supplies. Don't bother with those.
>
> The next time you got a a hamfest & see a stack of old GE Progress
> Line transceivers or the like, pay closer attention!
>
> KB0SFP
>
>
>
> ----- Original Message ----
> From: "wf2u at ws19ops.com" <wf2u at ws19ops.com>
> To: milsurplus at mailman.qth.net
> Sent: Wednesday, December 17, 2008 1:45:10 PM
> Subject: Re: [Milsurplus] solid state dynamotor
>
> I'm dealing with a somewhat similar situation where I need a
> substitute for the dynamotor (12 VDC in, 500 VDC @ 200 mA out) which
> I don't have and may never find, for an AT-1, a WW2 vintage
> Canadian Marconi built aircraft transmitter.
> I bought a 150 W, 12 VDC to 115 VAC car inverter for $24, which is
> fairly small.
> I'll get a 115 to HV transformer - probably out of my junkbox,
> rectify the output and it'll work fine.
> If one side of the inverter's 115 VAC output can be grounded (the
> -12 VDC is ground), I could just quadruple the 115VAC and get close
> to 500VDC out, without using a transformer.
> Since the transmit/receive relay in conjunction with the system
> receiver (AR-2, which has a good working dynamotor) turns on the
> transmitter dynamotor only on transmit, I'm not even concerned with
> RFI from the inverter, as it won't be on during receive periods.
>
> In receiver only service, any such inverter should be evaluated for RFI.
>
> 73, Meir WF2U
> Landrum, SC
> Quoting Ray Fantini <rafantini at salisbury.edu>:
>
>> Anyone have a DC to DC inverter or solid state dynamotor
>> replacement? Was thinking of building up a replacement power
>> supply deck for my ARR-41 I am going to remove the original
>> dynamotor deck and set it aside in case I want to use it but want
>> to build a solid state replacement deck that will fit into the
>> original radio and allow it to operate without the noise of the
>> dynamotor deck. Do not want to change any of the DC distribution
>> wiring so would prefer to use something like the solid state
>> replacement dynamotors that were used on some of the last produced
>> ARC equipment, also if anyone has a hacked ARR-41 power supply
>> deck less dynamotor that will save a lot of fabrication.
>> Ray Fantini KA3EKH
>>
>>
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