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Author Topic: 2kV Volt at 500 mA (peak) about 200mA continuous, in the PU truck?  (Read 4410 times)
AH7I
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« on: May 13, 2016, 07:44:03 AM »

Now that I've got the HW32 ALMOST installed, thoughts of additional power are intruding.
Why not a tube amp to go with it?
I'm thinking a single GI7. Available heater power is about right.
But, where to get the HV?
I know the Heathkit HP-14 will do.
But,  I'm looking for something cheap...to match up with the rest of the system!

suggestions?



« Last Edit: May 13, 2016, 09:16:16 PM by AH7I » Logged
N3QE
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« Reply #1 on: May 13, 2016, 07:49:39 AM »

BD-77 Dynamotor, as used with the BC-191, took in 12V and put out 1000VDC at 350mA. Two in series?

Back in the 70's, war surplus BD-77's were just $5.95. See ad at bottom of page 274: https://books.google.com/books?id=aCQDAAAAMBAJ&lpg=PA274&ots=SdFhkPM5xI&dq=bd-77%20bc-191&pg=PA275#v=onepage&q=bd-77%20bc-191&f=false
« Last Edit: May 13, 2016, 07:51:49 AM by N3QE » Logged
AH7I
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« Reply #2 on: May 13, 2016, 08:05:28 AM »

Alas, time travel is not an option. I will keep an eye out at the next ham fest.
Holdup on the HW32 install is HOT filter caps in the HP13. Ordered some replacements today.
I suppose I should use some this Friday off for yard/antenna work.
73, -Bob
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AD4U
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« Reply #3 on: May 14, 2016, 04:55:57 AM »

When I make the 7 hour trip to visit my daughter in Va Beach, I put a Heath SB-220 in the passenger seat (secured by a seat belt in case of a quick stop). I put my Honda 3000i generator in the pickup truck bed and run the SB-220 from the generator. The amp makes a big difference and the Honda 3000i is VERY QUIET.

Dick AD4U
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KH6AQ
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« Reply #4 on: May 14, 2016, 05:18:46 AM »

A simple way is to build a standard 60 Hz power supply and supply it from a 2 kW DC-AC inverter. I suspect a sinewave inverter may have less output RFI but the input might still be a good source of noise. It will probably need its input and output to be filtered and might need to be placed in a shielded box. That's how I quieted down a 100 watt inverter.
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AH7I
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« Reply #5 on: May 14, 2016, 06:46:24 AM »

Dick!
That's one way to do it!

W7XG!
That's a lot of stuff. But, I like the inverter idea. An old HP14 would be perfect.

It looks like the newer control IC's will let me use a simpler transformer that the one in the HP14. Maybe wind my own?

-Bob
 
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KH6AQ
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« Reply #6 on: May 14, 2016, 07:03:31 AM »

What is an HP 14?

It sounds like you'd like to build a switching power. I design switching power supplies (one of my jobs at work) and would not think of doing a one-off for ham use, especially at that power level and voltage. Off-the-shelf AC-DC inverter prices are probably lower than buying parts to make your own.
« Last Edit: May 14, 2016, 07:05:44 AM by WX7G » Logged
G3RZP
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« Reply #7 on: May 14, 2016, 07:08:20 AM »

IIRC, the Heathkit HP14 was the mobile PSU for the Heathkit HA14 (?) kilowatt mobile amplifier running a pair of 572Bs.
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K6AER
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« Reply #8 on: May 14, 2016, 03:08:46 PM »

Dick,

Do you have an air conditioner sticking out of the side window. Those tubes can get hot.
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AD4U
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« Reply #9 on: May 14, 2016, 06:09:58 PM »

Dick,

Do you have an air conditioner sticking out of the side window. Those tubes can get hot.

Nope but good AC in truck. I mostly operate the amp on 40 and 20 in the mobile and only on LONG trips. Normally I just run the 100W Yaesu FT100D. The amp makes a big difference. I used to run the BIG Bug Catcher, but now I use the next higher band Hustler KW resonator with a much longer whip to resonate it on frequency. IMO in a mobile every inch of antenna (and less coil) makes a difference. The Honda 3000i is so quiet that I cannot even tell it is running. A full tank of gas will run the generator for the entire 7 hour trip.

Dick AD4U
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KM1H
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« Reply #10 on: May 18, 2016, 06:43:46 AM »

For $2100 it better be quiet!
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AH7I
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« Reply #11 on: May 19, 2016, 02:20:19 PM »

What is an HP 14?

It sounds like you'd like to build a switching power. I design switching power supplies (one of my jobs at work) and would not think of doing a one-off for ham use, especially at that power level and voltage. Off-the-shelf AC-DC inverter prices are probably lower than buying parts to make your own.

Thanks. I'll see what I can find/learn.
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