[Milsurplus] Coding

[J. Forster]

Recap:  I have an ART-4 'target sleeve' transmitter. It was for AA gun
practice, I believe, and scored the closeness og the shell approach to the
aircraft-towed target.

There is just about nothing on the web. I have traced out 1/2 of the unit.
It's a simple, transformer coupled, RF oscillator plus a PA, using both
halves of a 3A5. The PA section is tunes to roughly 75 - 125 MHz.

However, the oscillator section, if I'm reading the C values correctly, is
tuned about 100x LOWER.

There is obviously an issue with the cap coding. It has to do with where
the arrows are on a postage stamp mica. Really archane stuff.

I got some more info yesterday, and that may resolve it.

More later.

-John

==================



> de WB2CPN
> My apology, but could you rerun the question again.
> You could send that info to me at whitaker at ieee.org if
> you'd like to.
> I am intrigued by your statement that it couldn't possibly work.
> That's why I'd like to go over it again.
> Tnx  73  Clete
> +++++++++++++++++++++++++++++++++
>
> On 8/10/2013 6:17 PM, J. Forster wrote:
>> Good guess, but that's not the issue.
>>
>> I'm trying to reverse engineer the ART-4 unit. I've traced the thing and
>> know how it actually works, BUT according to the capacitor marked values
>> it cannot possibly work. Things are wrong by 100x, at least.
>>
>> Hence my various questions.
>>
>> -John
>>
>> ===================
>>
>>
>>
>>> Hi
>>>
>>> Value substitution is always going to be a question on stuff made
>>> before
>>> the magic numbers we now (mostly) use came into being. A practiced eye
>>> and
>>> a good schematic should give you a pretty fair idea what to do. Not
>>> every
>>> value is critical +/- 1%.
>>>
>>> Bob
>>>
>>> On Aug 10, 2013, at 5:35 PM, J. Forster <jfor at quikus.com> wrote:
>>>
>>>> All and good, but my question has nothing to do with knowing the color
>>>> code.
>>>>
>>>> It has to do with actual component values, like is 500pF an actual
>>>> value,
>>>> when the preferred values are 470 or 510 pF.
>>>>
>>>> -John
>>>>
>>>> ==============
>>>>
>>>>
>>>>> And then there's always:
>>>>>
>>>>> "George Elliott's old grandfather rode a pig home yesterday"
>>>>>
>>>>> Geography, don't ya know?
>>>>>
>>>>> Clare
>>>>>
>>>>>
>>>>> On Sat, Aug 10, 2013 at 3:29 PM, Laura and Jim
>>>>> <mcenfalz at humboldt1.com>wrote:
>>>>>
>>>>>> I learnt this in the early 1970's:
>>>>>> Bad Boys Rape Our Young Girls Behind Victory Garden Walls, But
>>>>>> Violet
>>>>>> Gives Willingly
>>>>>>
>>>>>> Learnt another one for the Geologic Time Scale in college, but it's
>>>>>> pornographic. Mongo likes it though, and hasn't forgotten it yet,
>>>>>> hihi!
>>>>>>
>>>>>> 73 DE JIM K6FWT
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