[Elecraft] (OT redoux) MAG LOOP ANTENNAS

[Fred Jensen]

Many years ago, when computers filled buildings, consumed a megawatt or 
two, and the IBM CEO forecast a world-wide market for them of maybe six, 
ten tops ... automatic antenna matching, particularly in HF mobile 
environments, was sometimes achieved by sampling the voltage and current 
at the feed point and driving a motor on the matching unit's capacitor 
shaft to make the phase difference zero [i.e. resonance].  Should be 
able to do that with a mag loop today in a much smaller package.

I do wish Alex had put a 10:1 drive on the capacitor shaft however.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 1/23/2017 11:16 AM, kevino z wrote:
> I just wish Alex would release the motor to control the tuning...
> -Kevin (KK4YEL)
>
>
> -----
> The problem with the world is that the intelligent people are full of 
> doubts, while the stupid ones are full of confidence.
>
> On Jan 23, 2017, at 14:13, Fred Jensen <k6dgw at foothill.net 
> <mailto:k6dgw at foothill.net>> wrote:
>
>> Good to know.  I've never tried my Alexloop inside the house, but for 
>> an all-round portable antenna it meets the requirements of size, ease 
>> of set-up/take-down, and working well at QRP-ish power levels.  The 
>> tuning problem is mitigated by the fact that I usually sit directly 
>> under it when it's mounted on the tripod and I can just reach up and 
>> adjust it.
>>
>> 73,
>>
>> Fred ["Skip"] K6DGW
>> Sparks NV DM09dn
>> Washoe County
>>
>>
>> On 1/23/2017 5:21 AM, Doug Turnbull wrote:
>>> Fred,
>>>     Well put and useful.    I can though testify that the AlexLoop 
>>> can work
>>> amazingly well from inside a frame house and even a stone house as I 
>>> have
>>> tried this.
>>
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