[ARC5] Oddball ARC-5 T-16 Transmitter

[Michael Hanz]

The reason they grouped the MF units separately was not because of any 
desire to accommodate a single transmitter, but because their lower 
frequency range sometimes required additional conditioning of the 
antenna - accomplished through the TN-6/ARC-5.  The only difference 
between the MF transmitters and the "normal" compliment is that the 
select relay ground and +28v goes out to the TN-6 as well (when 
needed).  The RF relay in the TN-6 had to be coordinated with the 
associated transmitter selected for transmitting, so that it could 
switch in the additional loading coil at the same time.  If it wasn't 
needed, it simply wasn't plugged into any of the three transmitters.  
See the second and third photos on the page at 
http://aafradio.org/flightdeck/arc5-2.htm and Figure 8-18 in the manual.

     -Mike  KC4TOS

On 5/22/2017 9:48 AM, J Mcvey via ARC5 wrote:
> This is probably not news to you but I was surprised to learn that on 
> ARC-5 manula page 135/136 they group transmitter over-all control 
> wiring for Types 18 to 22.
> types T-15 through T-17 are described separately . T-16 is on page 
> 139/140  ( pdf page 153).
> The common characteristic is that the antenna relay control of t-15 to 
> t-17 is not wired with the select switch, but is controlled by it's 
> own dedicated plug input.
>
> Since these must have had a different antenna system than the t-18 to 
> 22 group, I suppose it is conceivable that no antenna relay was used 
> if it was a "solo" MF transmitter installation.
> From prior discussions, I don't think we are sure what these "special 
> purpose" transmitters were used for originally, so anything is possible.
>
> Does it look like a "factory " interface from the inductor to the 
> antenna? Got Pix? Are there relay mount holes?  Inquiring minds want 
> to know as I have never personally seen one of these transmitters!
>
>
> On Monday, May 22, 2017 1:31 AM, David Stinson <arc5 at ix.netcom.com> wrote:
>
>
> Oddball T-16 Transmitter.
> I'm working to revive an AN/ARC-5 T-16 transmitter
> for a friend.  It has a few issues I'm addressing.
> No drill holes, good paint and looks very recoverable
> with a little work.
>
> The transmitter's Antenna Switching relay is absent.
> Not unusual in itself; there are other signs of a visit
> by the "Ham-burgler" in the rig.  Was going to replace
> it when I noticed something strange. Normally, there
> is a small notch through the chassis, behind the front
> panel on the radio's Port side.  This gives passage
> to the two wires that connect the Antenna relay.
> But in this transmitter, there is no notch.  No wires
> going forward.  No little "keeper" that usually holds
> them down to the underside of the chassic next to
> the side wall.  And no evidence of wires having
> been removed from where these two usually connect.
>
> It appears this radio was produced with no antenna
> relay installed.  I find that difficult to accept, but
> the fact of the missing chassis notch, etc. is clear.
> There simply isn't a way to pass the two wires
> to the chassis underside.
>
> I've never seen this.  Any ideas?
>
> TNX OM ES 73 DE Dave AB5S
>
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