[ARC5] The value of MO and PA tank components.

[J Mcvey]

The easiest approach is putting the raw component on a LCR meter. If you only have a cap meter, no worries, take the half mesh value and plug it into this equation:
L =  1/((2*pi*f)^2 *C )  where L is henrys C is Farads (100 pf = 100* 10^-12 Farads) and f is the dial center freq. ( if there are two caps in parallel in the circuit, use that parallel value for C. This will get you in the ballpark.
However as stated, raw compont tests on a LCR meter is your best bet.
 

    On Wednesday, March 23, 2016 2:57 AM, Leslie Smith <vk2bcu at operamail.com> wrote:
 

 
To all:

I wish to learn the values of the oscillator and PA tank components in
the ATA, SCR and ARC-5 transmitters.

These are, for the oscillator:  T53, C60, C63 (M.O. turning) and C68.

For the PA Tank circuit: T54A & B, C65 (PA tuning), C66 and C67.

The manual gives the following information for T54:

    Frequency          Dwg #  (from WECO)
    3 to 4 MHz        7347
    4 to 5.3            7248
    5.3 to 7            7249
    7.0 to 9            7250

Information is given in Table #20, page 126 in hard copy. (or page #141
in PFD numbers) about these items, but not the value (uH, pF).  I
presume this is because different values are used for the different
frequency range in each type of transmitter.

I searched the tech manuals to my best ability.  My point here is that
I'm writing AFTER making a diligent search, rather than trying to avoid
this work.

If anyone on the list can advise where I might find component values for
the tank components I'll be grateful.

Thank you,

Les

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