[ARC5] Why an UNUN?

[Mike Hanz]

On 10/24/2012 6:28 PM, J. Forster wrote:
> The 13 seems a bit high. Is there a lower limit given also? I don't have
> that manual to hand.

As one might expect, there is no published lower limit that I can find.  
There is a note in para 1-24 that records. "The power output of each of 
the transmitters, under optimum antenna loading conditions, exceeds 40 
watts cw and 15 watts voice carrier. Considerably less power than this 
will be obtained when using short antennas whose capacitance may be as 
low as 50uuF, and whose total resistance may be one ohm or less."  That 
sorta sets the boundary conditions for the equation, but it simply says, 
"It all depends...":-)

  - Mike

> ==========
>> The manual gives a range of values, John.  The upper limit is around 13
>> ohms resistive, but it also expects a capacitive component.  See para
>> 1-28 in the ARC-5 manual, although the SCR-274-N and ATA manuals contain
>> the same data, IIRC.
>>
>> On 10/24/2012 6:06 PM, J. Forster wrote:
>>> Where did the 12 Ohms, resistive, come from? A manual? The value of a
>>> dummy load? Where?