AM Broadcasting

[rcbenedict1545]

The Phasor used by directional stations is not a matching unit. It is a power divider phasing unit as each tower gets different current, phase to develop the pattern. Each individual tower has an ATU.  The phasor for a 12 tower station is fascinating as is the pattern.
Ray
W8LYJ

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[Bob McGraw - K4TAX]

WOW!  12 towers.   I've only worked with a 3 tower directional array
that was switched between 2 frequencies and 4 different patterns.   A
small 100 KW shortwave transmitter and it too switched between the 2
frequencies.    Flip the switch and hope that the TX quenched as it
should, all switched as they should and came back up at 100 KW.   A bit
u-nerving when all of this happened.   I do recall once there was a
flash over in a tower switching unit which set the sagebrush on fire.  
Made for an exciting afternoon.

73

Bob, K4TAX



On 12/21/2018 10:26 AM, Raymond wrote:

> The Phasor used by directional stations is not a matching unit. It is a power divider phasing unit as each tower gets different current, phase to develop the pattern. Each individual tower has an ATU.  The phasor for a 12 tower station is fascinating as is the pattern.
> Ray
> W8LYJ
>
> Sent from my iPhone
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[NK7Z]

I worked in TV where we had one tower, and one antenna, and just
downtilt to worry about...

73s and thanks,
Dave (NK7Z/NNR0DC)
https://www.nk7z.net
Award Manager, 30MDG Grid Contest
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 12/21/18 2:19 PM, Bob McGraw K4TAX wrote:

> WOW!  12 towers.   I've only worked with a 3 tower directional array
> that was switched between 2 frequencies and 4 different patterns.   A
> small 100 KW shortwave transmitter and it too switched between the 2
> frequencies.    Flip the switch and hope that the TX quenched as it
> should, all switched as they should and came back up at 100 KW.   A bit
> u-nerving when all of this happened.   I do recall once there was a
> flash over in a tower switching unit which set the sagebrush on fire.
> Made for an exciting afternoon.
>
> 73
>
> Bob, K4TAX
>
>
>
> On 12/21/2018 10:26 AM, Raymond wrote:
>> The Phasor used by directional stations is not a matching unit. It is
>> a power divider phasing unit as each tower gets different current,
>> phase to develop the pattern. Each individual tower has an ATU.  The
>> phasor for a 12 tower station is fascinating as is the pattern.
>> Ray
>> W8LYJ
>>
>> Sent from my iPhone
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
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[W2xj]

There aren’t many 12 tower arrays out there. Of the few, the pattern is almost always a tight cardioid. 9 tower arrays are more common. The largest I have built is 10 towers. If I had my way that would have been 12 towers. There are many subtle technical reasons for that. A lengthy discussion.

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> On Dec 21, 2018, at 08:26, Raymond <[hidden email]> wrote:
>
> The Phasor used by directional stations is not a matching unit. It is a power divider phasing unit as each tower gets different current, phase to develop the pattern. Each individual tower has an ATU.  The phasor for a 12 tower station is fascinating as is the pattern.
> Ray
> W8LYJ
>
> Sent from my iPhone
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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