[Milsurplus] what is it?

[Francesco Ledda]

In aircrafts such as B-707, KC-135 and B-58, the antenna tuners are located
inside the tip of the vertical stabilizer. It requires a big scaffolding to
access them; it seems plausible that they left there, to avoid the trouble
of setting up the scaffolding.

In the DC9, the HF antenna is installed on the tail cone. I don't remember
where it is on the DC-8.

Francesco

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Bruce Gentry
Sent: Sunday, December 04, 2011 11:54 AM
To: Milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] what is it?

What kind of HF antenna did the B-58 have?  Because it was supersonic, 
could a wire antenna be used, or did it use a portion of the skin as an 
antenna?  The antenna on a Boeing 707 or C-135 is very obvious, but how 
about the B-47 or a DC-8 airliner ? 

It's somewhat strange that with all the radios and control boxes  
available,  you don't see very many antenna tuners.  Did they all get 
trashed with the airplane when it was scrapped?

     Bruce Gentry, KA2IVY


Francesco Ledda wrote:
> It comes from an Univac antenna tuner from a B-58 Hustler.
>
> Sent from my iPad
>
> On Dec 4, 2011, at 6:50 AM, Mike Hanz <aaf-radio-1 at aafradio.org> wrote:
>
>   
>> Not sure of the specific equipment, but this looks like an aircraft 
>> antenna tuner, missing the variable vacuum capacitor.  They're used with 
>> transmitters remotely mounted from the antenna using a long 50 ohm 
>> transmission line, and condition the antenna impedance to 50 ohms at any 
>> of the operating frequencies so that there are minimum losses in the 
>> coax.  The transmitter is pre-aligned to feed a 50 ohm resistive load, 
>> so tuning at that end is eliminated.  The concept works well with a ham 
>> antenna on the ground as well!
>>
>> On 12/3/2011 10:19 PM, Paul Kraemer wrote:
>>     
>>> From a pal of mine
>>> Very interesting rotary inductor driven by a servo
>>> Paul K0UYA
>>>
>>>
https://picasaweb.google.com/davidjmessing/ServoRollerInductor?authuser=0&au
thkey=Gv1sRgCOSizuKckKuhSQ&feat=directlink
>>>       
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