[Milsurplus] [ARC5] I Must Have Lost My Mind...

[Richard]

The various engine-generator and motor-generators for the TBW are rated 
1 kw output.  I use an aircraft 800-1 "Screaming Mimi" inverter for my 
TBW, which works fine.  The problem is the 800 cycle generators are very 
noisy - I measured 90 or 95 dB at three feet, the same as a subway train 
running through the shack.  It's mostly magneto-striction, and there is 
nothing which can be done with it.  My solution is a noise-reducing box, 
which reduces it to 50 dB, conversation level.  Depending where you 
stand you hear nothing, or  a distant whine, which adds ambiance to the 
shack and impresses visitors.

Richard, AA1P

On 8/12/19 2:31 PM, revcom at wbsnet.org wrote:
> When I worked for an area Generation/Transmission power company we used
> a -Behlman-Ivar- variable power supply.  It delivered 50-150VAC at
> 20-1000Hz, 1000Watt from 120VAC/60Hz.  We used it for testing harmonic
> sensitivity of protective relaying systems and when measuring ground
> resistance on our 345KV transmission substations.  Sure was a nice box.
> I tried to buy it when it got 'retired' (was old fashioned, used tubes!)
> after I left, but alas, was told it got "recycled".  Be an ideal supply
> for your application.
>
> Rod
> K0EQH
>
>
>
>   I'm with Mike.  I'd like to run it "as designed."  However, the power
>> supply has been modified,  but I haven't had the time to take it out of
>> the truck and examine the mods.  No idea if it can be recovered to 800
>> cycles.  We'll see.
>>
>> 73 Dave S.
>>
>>
>> On 8/12/2019 10:53 AM, Michael Hanz wrote:
>>> Because of the way the keying is designed in the GO-* and GP-* sets.Â
>>> With a relatively high frequency power source, the designers keyed the
>>> primary (115vac) side of the high voltage supply, with only a 1Hy and
>>> 2ufd filter capacitor needed.  You would have to come up with another
>>> way of keying the transmitter if you didn't want to use 800Hz (or
>>> higher...) primary power. People did, and if it's yours you can do
>>> with it what you wish, but others consider it a challenge to get it to
>>> work as intended. I fall into the latter group.
>>>
>>>  - Mike  KC4TOS
>>>
>> ---
>
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