>Whats wrong with a Dynamotor?
Well lets see, hi, just for fun.
1. very inefficent with it producing lots of heat.
2. very very expensive to make, component and labor wise (the labor factor goes
away if made in China, but can't count on getting one that want kill you with
normal use).
3. very heavy (minor factor in aircraft that requires 11 lb of air plane to fly
1 lb of payload...on the Space Suttle cost $10,000/lb to fly).
4. very noisey, but so are the operators.
5. takes time to come up and deliever power.
6. not very well regulated, but for tubes not a problem.
7. takes up lots of space (in the progline took 1/3 of the radio.
What is good about a Dynamotor?
1. makes pretty good boat anchor, however, some of the materials are not
friendly to the enviorment.
2.. all I can think of
However, some of the high powered first transmitters were Dynamotors. Actually
took DC motors, geared them up to the RPM and added poles to a generator so one
got the kHz of frequency wanted. Guess modulated the stator to get coil
modulated AM. Now doing FM...minor problem. Did work better than the spark
gap, but much harder to make and use.
Last place where I had a real job we had to have 400 Hz power (was military
electronics). A dynamotor config was used...60 Hz syncronise? motor coupled to
shaft of 400 Hz generator. Worked great.
The Dynamotor was what was avialable for the time, did its job and gave many
like Vincent N6OA/2 and many others the pleasure of radio.
I love this stuff.
73, ron, n9ee/r
>From: Vincent McKever <[EMAIL PROTECTED]>
>Date: 2007/08/01 Wed AM 07:59:19 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Your old work bench - shop pictures are on
>ebay!
>
>Whats wrong with a Dynamotor? Ran my Moto 140-D just fine. My
>headlights got real dim when I would squeeze the PTT but was a great
>power supply. Then T power came along and caused all sort of new
>problems. Seems to me we got started with this FM thing back in the
>50's some time.
>
>Vincent N6OA/2
>
>Don KA9QJG wrote:
>>
>> The First time I got Shocked at about 16 yrs Old now 60, I had a
>> Regency Tunable scanner/Receiver had a Vibrator Sometimes it would not
>> work. But if you would bang on it would. So I got a Hacksaw and cut
>> the Cover off thinking I could fix it,
>>
>>
>>
>> I put power on it and Heck it was only 12 Volts, I could hold that in
>> my hand and never got shocked
>>
>> So the Old vibrator was not working I just put my Finger in it and
>> pushed a little well it started working and I got knocked on my Butt
>> Hurt like heck, I will never forget that and I learned at a young age
>> to respect Electricity.
>>
>>
>>
>> Yes we know we are getting old when we recall seeing Equipment like this
>>
>> I recall many Yrs ago giving a Guy who was a Ham a jump Start Because
>> he had a old Motorola in the Trunk on 6 Meters it had a Dynamotor
>> Power Supply.
>>
>>
>>
>> Happy Repeater Building
>>
>>
>>
>> Don KA9QJG
>>
>>
>>
>
Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.
