[Lowfer] Frequency usage question

[N8OOU]

Warren, You cleared up an additional section in the Wm Beacon exciter 
for me. I had not yet figured out the purpose of a couple transistors 
and their output on the control line to the Power amp at the antenna.

Now knowing that Bill used two loops I can confirm the circuitry exists 
in the controller to do just that.  That little box is quite an 
engineering marvel.

Thanks

73   de   N8OOU - Mike Meek

On 11/12/2014 08:28 AM, Warren K2ORS wrote:
> On the subject of multiple loops, I recall that at one time Bill Ashlock
> had two lopps, a N-S and an E-W. He would transmit a "W" on one loop and
> an "M" on the other.
>
> Loop directivity is not a deal killer though, my Part 5 137kHz signal
> has been copied in South America even though the loop is oriented to
> have its maximum in the E-W plane.
>
> Warren
>
>
>
> On 11/12/2014 9:02 AM, JD wrote:
>>>>> And for Part 15, the vertical is more defensible for regulatory
>>>>> purposes than a 50x50 foot loop.
>>
>> Not a trivial concern, IMHO.  Equating a 200 foot run of radiating
>> conductor to the total length of 15m specified in the Rules is quite a
>> mental challenge.  (Conversely, for Part 5 Experimental Service
>> licensees or hams in countries with LF allocations, it's no issue at
>> all.  Licensed operation might be a better alternative than Part 15 for
>> anyone stuck needing to use a loop because of local arboreal
>> circumstances, anyway.)
>>
>> Along with that concern, plus the lower radiated field strength for a
>> given physical size as John A mentioned, the third disadvantage of a
>> transmit loop is that it is directional.  The very property that
>> generally gives loops a big advantage for receiving can be a detriment
>> when transmitting.  Prime example:  On 2200m, I can generally see MP day
>> and night because my QTH lies roughly in the same alignment as Mitch's
>> loop; whereas MP is a nighttime-only catch for other folks who are at
>> comparable distances or even nearer, but who are located off to the
>> sides of the main lobes.
>>
>> There are ways to fill the nulls of a loop, of course, but either at the
>> cost of efficiency (ie, intentional or accidental coupling to other
>> conductors--or even semiconductive natural objects--in the vicinity) or
>> else by implementing a second entire loop and feeding it in
>> phase-quadrature, which is even less realistic for Part 15.
>>
>> John D
>
>
> ---
> This email is free from viruses and malware because avast! Antivirus
> protection is active.
> http://www.avast.com
>
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
> Post must be less than 50KB total for message plus attachment!
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>