[ARC5] ARC5/SCR-274N question - L-52 - Correction

[john rose]

Mike, the T-16, 17, and 18 all use the same roller, #7992.

I too have read, re-read and re-re-read the sections on the TN-6 until I am 'read' in the face. My interpretation is there are inconsistencies and contradictions aplenty. I have never seen a TN-6 in the aluminum. I have never seen as much as a picture of the interior one. It's all a mystery.  

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> Date: Thu, 14 Mar 2013 00:28:14 -0400
> From: kk5f at earthlink.net
> To: milsurplus at mailman.qth.net; arc5 at mailman.qth.net
> Subject: Re: [ARC5] ARC5/SCR-274N question - L-52 - Correction
>
> Mike wrote of the T-15 L-52:
>
> > Actually, it is an outer ceramic coil and an inner phenolic
> > coil...similar to the TN-6 antenna tuner coil approach.
>
> Mike, that description must apply **only** to L-52 (ARC-9271) for the
> T-15/ARC-5. Even the T-16 L-52 is conventionally wound on ceramic.
> I don't have a T-15 to look at. Is the inner coil in series with
> the roller coil inductance, such that the inner inductance is always
> in the antenna circuit even when the roller is at zero?
>
> It makes a little sense, I guess, but it's still surprising.
>
> The AN/ARC-5 maintenance manual says that only a fraction of one watt
> will reach the antenna when using the TN-6 and a short fixed antenna,
> but it also says that the TN-6 allows use of short antennas from 1.0
> to 2.1 MHz. So even a TN-6 won't help a T-15 and a short antenna.
>
> One wonders why the T-15 to T-17 exist. If they were to support actual
> aircraft command communications, they were most likely on small aircraft
> without trailing wire antennas, and radiating that fraction of a watt.
> Larger aircraft could fire up the AN/ART-13 with O-16, and use the
> trailing wire. The documented intended use of these three "special purpose"
> transmitters remain one of the more interesting mysteries.
>
> 73,
> Mike / KK5F
>
>
>
>
>
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