[time-nuts] Fluke 203A Distribution Amp available

[Dave M]

> On 4/12/2011 4:27 PM, Dave M wrote:
>>> From: Dan Rae <danrae at verizon.net>
>>>
>>> I have a nice Fluke 203A , modified from one 5 MHz in and 12 out to
>>> one 10 MHz in and 12 outputs for sale.
>>>
>>> This is a 2U rack unit similar in function to the -hp- 5087A with
>>> metering etc., with a printed copy of the pdf manual.
>>>
>>> Please contact me direct if interested with any offers before this
>>> goes to ebay.
>>>
>>> Dan
>>
>>> ------------------------------
>>
>> Dan,
>> I have a good Fluke 203A and manual also, but it's a standard unit,
>> only having standard 1MHz and 5MHz input and output modules.  Are the
>> 10MHz modules from Fluke or did you make the mods?  If the 10MHz mods
>> have been documented, amd it's possible for you, could you  scan and
>> post the applicable pages for those modules?
>
>
> Dave,
>
> I don't think Fluke ever made any 10 MHz modules, from the manual
> anyway.  I kept all the inductors as is; in the pre-amp, changed the
> tuning Cs C1 and C2 from 1000 pF to 220 pF.
> In the output amp change:
> C1 and C2 to 220 pF
> C3 to 68 pF
> C5 and C8 to 22pF
>
> I also put a 2k2 resistor across T2 in the output amps.
>
> The modified modules peak up nicely like that with the cores not far
> off
> where they were before.  Ive had it going for about five years and
> just
> rechecked it, it seems pretty reliable :^)
>
> Dan
>
> ------------------------------

Many thanks for the data, Dan.  I am assuming that the mods were done on the 
5MHz boards?  Would seem logical...

Thanks again for the info!!

David
dgminala at mediacombb dot net