>
>Hi Glenn and AMPS folks,
>
>The Yaesu power supply that you are referring to has got to be the
>FL2000/2100 voltage doubler supply, with which I'm intimately familiar.
>I have an old FL2000B, which is now an FL2000/QB (if you want to know what
>that is, read on....).
>
>Secondary resistance is 19.5 Ohms! apparentlly with no ill effects. The
>transformer is rated at 850Watts. Later models (FL2100xx) use the same core
>for HV as well as filament/utility, "stealing" some 60W from B+! FL2000B has
>a separate filament/utility voltage transformer, leaving the entire core
>capacity for B+)
>
>When I performed the change from the /B to the /QB suffix (Out went the
>572Bs and in a single QB4/1100 - yes it is possible!), I also wired the
>primary so as to get the highest possible secondary voltage, the two 100V
>primary in series fed from our 230V net. yielding approx. 950V secondary (No
>load). resulting B+ is 2830V (no load); 2750V idling; and 2450-2500V at
>700W+ out (400mA)
>
>Of cause the nearly 30 years old caps didn't last long at this, and I had to
>find replacement that would fit into the rather cramped space! I went for 8
>x 220uF/400VWV, that would fit into the same space as three of the old caps,
>in the process I gained an increase in capacity from 12.5uF to 27.5uF, which
>in my opinion has made the B+ regulation a lot better and the power supply
>much stiffer. Alas, should the big bang happen then......... Buyer beware!
> i have put in a current limiting resistor in B+)
>
>Vy 73 de OZ1PIF, Peter
>
? it sounds good, Peter.
>Sound clips from OX2K operation "off the air":
>http://hjem.get2net.dk/oz1pif/OX2K-sound.htm
>
>********** OZ1PIF **************
>email: oz1pif(no-spam-filler)@get2net.dk
>http://hjem.get2net.dk/oz1pif
>Shack Ph. +45 4619 3208
>Snailmail:
>Peter Frenning
>Ternevej 23
>DK-4130 Viby Sj.
>Denmark
>***********************************
>----- Original Message -----
>From: "Glenn McNeil" <vk4tzl@bigpond.com>
>To: <amps@contesting.com>
>Sent: Thursday, May 17, 2001 4:45 AM
>Subject: [AMPS] Voltage Doublers...thanks for the info.
>
>
>>
>> To Rich, Dick, Steve and Ian...and any others I may have missed...
>>
>> Thanks for all your input. Certainly there is more to FWD than I thought
>about.
>>
>> Further delving into the transformers background at this end has come up
>with the following :
>>
>> Primary Resistance is 1.4 ohms
>> Secondary Resistance is 12 ohms
>> I intend to use 5 x 190uf 400v caps in each leg with 1N5408 diodes.
>> I'm only trying to run a single 4CX250R
>> After sifting through lots of paper, I have discovered that the no load
>secondary voltage is 830 vac, up from my
>> approximate guess of 750 vac.
>> The transformer will only be supplying EHT...no other voltages.
>>
>> I think Steve suggested a lash up first....my metalwork at this stage will
>allow this.
>>
>> I have a copy of a Yaesu power supply in one of their linears...not sure
>which one, as I only have the relevant bit
>> after the transformer, which is very similar to what I have...850v with
>100uf 500v caps....albeit I dont know what the
>> transformer specs are.
>>
>> Anyway, now how to figure out how to load the lash up to see what I
>achieve.
>>
>> 73
>>
>> Glenn
>> VK4TZL
>>
>>
>>
>>
>> --
>> FAQ on WWW: http://www.contesting.com/FAQ/amps
>> Submissions: amps@contesting.com
>> Administrative requests: amps-REQUEST@contesting.com
>> Problems: owner-amps@contesting.com
>>
>
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- R. L. Measures, 805.386.3734, www.vcnet.com/measures.
end
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