That must have been a healthy size wench(-;
Before I recently obtained Gates BC-1T parts I was using a modulation
transformer from a 4CX5000A 10KW transmitter. About 375# and required its
own floor space but it was free, used my cherry picker to get it out of the
pickup and also to lower it thru the basement bulkhead. With that much iron
I didnt need to be concerned about a perfect impedance match either using a
loafing pair of 304TL's modulating a pair of 250TH's. The Gates is a very
close match plus I also got the modulation reactor and coupling cap plus all
the PS iron.
Carl
KM1H
----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: <amps@contesting.com>
Sent: Tuesday, June 14, 2011 1:46 AM
Subject: Re: [Amps] Voltage Doubler Regulation
> I still have the chokes and transformer from a 5kW FM transmitter that
> used a pair of 4-1000As.
> Talk about heavy. We used a large pipe and cable with two of us on one
> end and the old guy's son ( a weight lifter) on the
> other end of the pipe to set the power transformer into the trunk of the
> car. Used a wench to get it out.
> Never got around to useing it.
> another good source of parts is plasma generators. Have a few of those
> and sometimes you can get one that runs off
> 240 single phase.
> Got a 5kW one that uses a 3CX3000A7 which is identical to the 3kW one
> except the 5kW has two power transformers in
> parallel and the 3kW has only one. Take one out and I have a spare. Most
> of these came from university surplus auctions.
> I think i paid around $10 for the 5kW Henry Radio one.
> 73
> Bill wa4lav
>
> ________________________________________
> From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf
> Of Fuqua, Bill L [wlfuqu00@uky.edu]
> Sent: Tuesday, June 14, 2011 1:35 AM
> To: Carl; amps@contesting.com
> Subject: Re: [Amps] Voltage Doubler Regulation
>
> You know, I have done that. Got an 1kW AM transmitter and a freind that
> maintains AM stations in Nashville told me that he could not a off the
> shelf modulation transformer and choke for a Collins, if I recall
> correctly, he was working on and mine was a near perfect match. Since
> both were a pair of 4-400A s modulated by another pair.
> Got my money back and still had a nice cabinet, large coils, tuning
> capacitors and power supply and a few good 4-400A tubes.
> 73
> Bill wa4lav
>
> ________________________________________
> From: Carl [km1h@jeremy.mv.com]
> Sent: Monday, June 13, 2011 12:18 PM
> To: Fuqua, Bill L; amps@contesting.com
> Subject: Re: [Amps] Voltage Doubler Regulation
>
> You can buy a complete 1000-2500W AM/FM BC transmitter for less than a new
> Dahl transformer to run a 1500W PD tube.
>
> Then salvage the PS and all you need is space to mount it in which could
> be
> an average 3' high rack cabinet. Sell the remainder and recoup your cost.
>
> Carl
> KM1H
>
> ----- Original Message -----
> From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
> To: <garyschafer@comcast.net>; "'Mike'" <hinrgdj@centurylink.net>;
> "'Richard
> Solomon'" <dickw1ksz@gmail.com>; <amps@contesting.com>
> Sent: Monday, June 13, 2011 12:36 AM
> Subject: Re: [Amps] Voltage Doubler Regulation
>
>
>> It is like this. You do the best you can with the parts you can afford or
>> find.
>> There is no perfect solution or answer. Some power supplies sag more that
>> others
>> due to the transformer and many times due to the house wireing.
>> If you must have a power supply that does not sag so much and not have
>> some sort
>> of complex active regulation, you need to go to choke input filter and
>> full wave rectifier.
>> Start with an old powersuppy from an AM transmitter. It will be large,
>> bulky, heavy and
>> costly.
>> 73
>> Bill wa4lav
>>
>> ________________________________________
>> From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf
>> Of Gary Schafer [garyschafer@comcast.net]
>> Sent: Sunday, June 12, 2011 11:41 PM
>> To: 'Mike'; 'Richard Solomon'; amps@contesting.com
>> Subject: Re: [Amps] Voltage Doubler Regulation
>>
>> This circuit was referred to on here a few years ago. It will buy you
>> nothing as far as regulation. It will have poorer regulation than a
>> standard
>> full wave doubler. Of course you can increase the value of the output
>> capacitor and improve it but you can also do that with a standard full
>> wave
>> doubler.
>>
>> Look at the circuit closely. It is two half wave doublers feeding an
>> output
>> capacitor.
>>
>> 73
>> Gary K4FMX
>>
>>> -----Original Message-----
>>> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
>>> On Behalf Of Mike
>>> Sent: Sunday, June 12, 2011 5:26 PM
>>> To: 'Richard Solomon'; amps@contesting.com
>>> Subject: Re: [Amps] Voltage Doubler Regulation
>>>
>>> Richard, take a look at this web page figure 2. It takes more diode
>>> strings
>>> but gives very good
>>> performance over what the standard handbook FWD circuits we've been
>>> accustomed too! Use 6a10 diodes
>>> from mouser...cheap... http://208.190.133.201/lit/4x8/index.html
>>>
>>> Take note C4 is critical for best regulation and it only takes ~10-
>>> 20ufd. An
>>> oil filled cap
>>> or one of the russian poly hv caps listed on ebay works fb.
>>>
>>> The lower the sec R of the high V transformer the better, very
>>> important! A
>>> boat anchor tranny with 50 ohm
>>> Secondary will not work well ;-))
>>>
>>> Hope this helps!
>>>
>>> Mike, K4EAR
>>>
>>> -----Original Message-----
>>> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
>>> On
>>> Behalf Of Richard Solomon
>>> Sent: Sunday, June 12, 2011 2:12 PM
>>> To: amps@contesting.com
>>> Subject: [Amps] Voltage Doubler Regulation
>>>
>>> I would like to look at ways to improve the Voltage Regulation in a
>>> Voltage
>>> Doubler Circuit.
>>> I tried Google, but didn't get much on the actual calculations involved.
>>>
>>> Since we have certain givens; such as The AC Line is what it is, the
>>> Plate
>>> Xfmr is what it is, the only variable in the equation would be the
>>> Capacitor
>>> value. Am I correct in that assumption ?
>>>
>>> Can anyone point me to a reference that I can use ?
>>>
>>> Thanks, Dick, W1KSZ
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
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