[SBE-89-Alaska] [EXTERNAL] Re: HARRP

Mon Aug 5 16:09:14 PDT 2024

So for instance in a rototiller antenna with a hard wave guide with a TE11 mode, how is the wave making it out of the rototiller, the thing looks completely sealed off and that it would just create a bunch of internal reflection.  OR are those nub ends non metallic caps from with which the RF goes from contained RF to free space RF?

[cid:image001.png at 01DAE749.6DE39070]

Thank you 😊
Ron

From: SBE-89-alaska <sbe-89-alaska-bounces at sea.sbe16.org> On Behalf Of Pearson, Ron via SBE-89-alaska
Sent: Tuesday, July 30, 2024 2:47 PM
To: Stephen Lockwood <lockwood at hatdaw.com>; Charles Sather <CSather at knba.org>; SBE-89-Alaska <sbe-89-alaska at sea.sbe16.org>
Subject: Re: [SBE-89-Alaska] [EXTERNAL] Re: HARRP

I have heard of these things talked about after my transition to EE but never could find a great reference on how exactly they worked.

I get installing single stub series and parallel with either capacitive resistive or inductive loads (or simply calculating the coax length) in order to eliminate reactive power (which is your imaginary reflected power).  I thought inductors had to be connected into the coax and not just slid over the outside in order to actually destructively interfere with reflected power.

Additionally, if an RF wave is generated inside of a transmitter via electron change of motion and that wave is then guided in a wave guide how is that wave dispersed and manipulated in say a rototiller antenna.  The root of the radiation is the electron manipulation in the transmitter itself.

From: Stephen Lockwood <lockwood at hatdaw.com<mailto:lockwood at hatdaw.com>>
Sent: Tuesday, July 30, 2024 12:38 PM
To: Pearson, Ron <RonPearson at iheartmedia.com<mailto:RonPearson at iheartmedia.com>>; Charles Sather <CSather at knba.org<mailto:CSather at knba.org>>; SBE-89-Alaska <sbe-89-alaska at sea.sbe16.org<mailto:sbe-89-alaska at sea.sbe16.org>>
Subject: Re: [SBE-89-Alaska] [EXTERNAL] Re: HARRP

Nautel insist on toroidal ferrites on the coax headed to the antenna.  As this keeps Thor from killing the MOSFETS.  As the HAARP Transmitters are tubes they are not quite a sensitive.  They are designed to operate anywhere on the smith chart for load impedance...  In fact off the smith chart as they can work with a negative impedance (power being fed back).

Stephen S. Lockwood, P.E., PMP, President

Hatfield & Dawson Consulting Engineers

9500 Greenwood Ave N, Seattle, WA 98103

Phone 206 783 9151 ext 562 - Mobile 206 399 9440 - www.hatdaw.com<http://www.hatdaw.com/>
On 7/30/2024 1:14 PM, Pearson, Ron wrote:
What are you referring to with ferrites?

From: Stephen Lockwood <lockwood at hatdaw.com><mailto:lockwood at hatdaw.com>
Sent: Tuesday, July 30, 2024 12:07 PM
To: Charles Sather <CSather at knba.org><mailto:CSather at knba.org>; Pearson, Ron <RonPearson at iheartmedia.com><mailto:RonPearson at iheartmedia.com>; SBE-89-Alaska <sbe-89-alaska at sea.sbe16.org><mailto:sbe-89-alaska at sea.sbe16.org>
Subject: Re: [SBE-89-Alaska] [EXTERNAL] Re: HARRP

There are none!

Stephen S. Lockwood, P.E., PMP, President

Hatfield & Dawson Consulting Engineers

9500 Greenwood Ave N, Seattle, WA 98103

Phone 206 783 9151 ext 562 - Mobile 206 399 9440 - www.hatdaw.com<http://www.hatdaw.com/>
On 7/30/2024 1:04 PM, Charles Sather wrote:
Did you get a count of ferrites for Jeff?

Charles Sather
Chief Operating Officer, Koahnic Broadcast Corporation
P. 907-793-3535 | koahnicbroadcast.org
Support KBC and its programs through Pick.Click.Give

From: SBE-89-alaska <sbe-89-alaska-bounces at sea.sbe16.org><mailto:sbe-89-alaska-bounces at sea.sbe16.org> On Behalf Of Pearson, Ron via SBE-89-alaska
Sent: Tuesday, July 30, 2024 10:30 AM
To: Stephen Lockwood <lockwood at hatdaw.com><mailto:lockwood at hatdaw.com>; SBE-89-Alaska <sbe-89-alaska at sea.sbe16.org><mailto:sbe-89-alaska at sea.sbe16.org>
Subject: Re: [SBE-89-Alaska] [EXTERNAL] Re: HARRP

Very cool thank you for the cliffs notes

From: Stephen Lockwood <lockwood at hatdaw.com<mailto:lockwood at hatdaw.com>>
Sent: Tuesday, July 30, 2024 10:20 AM
To: Pearson, Ron <RonPearson at iheartmedia.com<mailto:RonPearson at iheartmedia.com>>; SBE-89-Alaska <sbe-89-alaska at sea.sbe16.org<mailto:sbe-89-alaska at sea.sbe16.org>>
Subject: Re: [EXTERNAL] Re: [SBE-89-Alaska] HARRP

They did.   They use NEC4 (if I remember correctly).  It is just classic array physics - just big at these frequencies.  The physics is the same for the nifty flat panel radar arrays or curtain dipole arrays like we use in HF broadcasting.  They just have some very cool software to change the transmitter exciters to provide beam steering, circular polarization, and lots of other cool stuff.  Each dipole has its own transmitter.  180 cross dipoles with 360 10 kW transmitters.

Stephen S. Lockwood, P.E., PMP, President

Hatfield & Dawson Consulting Engineers

9500 Greenwood Ave N, Seattle, WA 98103

Phone 206 783 9151 ext 562 - Mobile 206 399 9440 - www.hatdaw.com<https://urldefense.com/v3/__http:/www.hatdaw.com/__;!!Fhnm7mQ!YevFlM_ZEfDefuiwzTJkzkf3AD_m2gz3bNuRV1vBloyNl5i_dk3lqxRT4g9XVBQQvAF9JlCoiH0A9Sxn42qDMt_OlQ$>
On 7/30/2024 9:44 AM, Pearson, Ron wrote:
Hello Stephen,

Was it awesome, did they go over finite element (MOM) models and programming on how the array was built and modeled and the conceptual motivation for the design?

Thank you 😊
Ron

From: SBE-89-alaska <sbe-89-alaska-bounces at sea.sbe16.org><mailto:sbe-89-alaska-bounces at sea.sbe16.org> On Behalf Of Stephen Lockwood via SBE-89-alaska
Sent: Wednesday, July 24, 2024 7:11 AM
To: Pierre Lonewolf <lonewolf at otz.net><mailto:lonewolf at otz.net>; SBE Chapter 89 Alaska <sbe-89-alaska at sea.sbe16.org><mailto:sbe-89-alaska at sea.sbe16.org>
Subject: [EXTERNAL] Re: [SBE-89-Alaska] HARRP

Did you find a ride?
Stephen Lockwood
On Jul 21, 2024, at 19:41, Pierre Lonewolf via SBE-89-alaska <sbe-89-alaska at sea.sbe16.org<mailto:sbe-89-alaska at sea.sbe16.org>> wrote:

Is anyone from Anchorage driving to the HARRP tour? I finally looked at the map and why am I going to Fairbanks!?

Pierre Lonewolf

PO Box 983

393B Whittier Street

Kotzebue, Alaska 99753-0983

19074120859 cell

19074423603 fax

Lonewolf at otz.net<mailto:Lonewolf at otz.net>

Plonewolf55 at gmail.com<mailto:Plonewolf55 at gmail.com>

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