That's because the NG doesn't know how to use them. With frequency agile ALE
they are very important.
Perry K4PWO
Sent from my Sprint Samsung Galaxy S7 edge.
-------- Original message --------From: Herbert Schoenbohm
<herbert.schoenbohm@gmail.com> Date: 1/25/17 12:22 PM (GMT-06:00) To: Doug
Smith <doug@w7kf.com> Cc: towertalk@contesting.com Subject: Re: [TowerTalk]
Strange Balun...please help
Thanks Doug.....It appears to be military surplus for a T2FD which are
common at military and diplomatic installations as well as sent to
National Guard com units that have no real use for them.
Herb, KV4FZ
On 1/25/2017 1:02 PM, Doug Smith wrote:
> I’d expect those to be flux coupled RF transformers designed for use with
> terminated antennas. Think rhombic or vee beams or terminated dipoles. Any
> chance they’re actually 800 ohms on the load side? A four to one turns
> ratio. I’ve seen such things in military and commercial settings.
>
> Doug, W7KF
>
>
>
>> On Jan 25, 2017, at 8:25 AM, Herbert Schoenbohm
>> <herbert.schoenbohm@gmail.com> wrote:
>>
>> I came into the possession of two unusual high power baluns, one with 125'
>> of RG-213 attached and the other with a two foot lead of coax attached.
>> They are seal and inside PVC with the coax going inside the bottom and large
>> eyelets for the wire and support in the center. They appear to be
>> commercially made. I soon found tat they are not current baluns judging
>> from the discovery that there is no DC continuity to either wire connection
>> from the coax. With a bridge and a 50 ohm non-inductive resistor the VSWR
>> is very high. However when I put a 1000 ohm resistor on the antenna
>> connections the balun is flat from 1.8 to past 60 Mhz. This would make the
>> device a 20:1 balun which is something I have never heard of. What kind of
>> antenna requires such a high impedance feed? If anyone has any knowledge of
>> the use for these devices please let me know. Thanks
>>
>>
>> Herb, KV4FZ
>>
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