[TransAtlantic] N7BHC Presentations

Wed Nov 11 22:36:01 EST 2009

Dave
Thank you!
very good info. we have a lot in common...I am the CEO of the Society of Cable Telecommunications Engineers in Exton, Pa.  13,000 members world wide...We have a lot of radio folks, so if you do not object, I will share some of the thinking with those interested....

Projects in the works at K4MHZ:
1. a 100w, (continuous) 432 MHz beacon is started for FM25. All the parts in hand.
2. Joe/CT1HZE asked if my 6m beacon on 50.0625 MHz can go to 100 watts. it appears to be the most frequently heard from the southern U.S. A 150W amp is in hand that we will run at 100w with dual blowers.

I agree on your thinking about the path from NC to Africa. I have been in Hatteras since 1986. lived there full time for a number of years with amazing openings that do not appear to be heard inland. BTW:  I monitored the sea water temp on the path to the Azores from FM25. It seemed to be cooler then last year. 

My earlier beacon was hit by lightning. The beacon was a modified commercial FM 50W radio keyed with a programable CW ID in loop mode.  It ran 30w into a M2 omni at 50'. lots of reports from VE's to the north and Florida to the south. When I heard San Juan Coast Guard on 156.800 & 157.100 MHz could not raise anyone on 144.200 or .300 10 years ago.  

hope to have my Commander II power supply rebuilt for 600W on 144.300 manned at peake window next year.  
lets talk more...
73
Mark
K4MHZ
-----Original Message-----
From: N7BHC <n7bhc at drasticom.net>
To: k4mhz at aol.com
Sent: Wed, Nov 11, 2009 8:32 pm
Subject: N7BHC Presentations

Mark, 

My SVHFS society presentations are available at http://sites.google.com/site/n7bhcvhf/files. Expanded versions of the two papers can be found in CQ VHF magazine. The article on subsidence ducting was in the previous issue, and the article on simple beacon/station construction is in the next upcoming issue. 

73, Dave - N7BHC 
=========================================== 
Email: n7bhc at drasticom.net 

N7BHC/B beacon 
FM15PA 
144.291 MHz CW 
50 W - 16 element horizontal pol. 
reports by email or phone +1 (704) 225-3928 
=========================================== 

On Nov 11, 2009, at 5:08 PM, k4mhz at aol.com wrote: 

> 
> 
> 
> 
> 
> Mark 
> it would be great to see a copy of N7BHC's presentation. 
> 
> to start a discussion, I am not sure Horizontal polarization is > optimal for a crossing. If water evaporization is a component of the > path, vertical may be more optimal. I am looking at the impact of > the pseudo brewster function over salt water to maintain a signal > that may stay within 10 meters of the surface for long distances. A > potential path woud be composed of evaporation and traditional > ducting. My marine vhf radio propogation work at 156 MHz was all > vertical with 25 watt radios, 3-6 dbd antennas less then 30' Many > Bermuda, Bahamas,Puerto Rico, etc receptions from Hatteras over the > years... 
> Thoughts? 
> Mark 
> K4MHZ 
> 
> 
> -----Original Message----- 
> From: Mark Casey <map at mapinternet.com> 
> To: WRemailer-TransAtlantic <transatlantic at mailman.qth.net> 
> Sent: Wed, Nov 11, 2009 3:24 pm 
> Subject: [TransAtlantic] Welcome Message to Trans-Atlantic Remailer 
> 
> 
> 
> Hello Friends, 
> Thanks for subscribing. Please let anyone know about this remailer > that you feel 
> ould be interested or have something to contribute. They need not be > hams. I'm 
> ure we'd love to have a transatlantic airline pilot with an interest > in VHF 
> istening subscribed, or maybe some DXer's that monitor the TV and FM > bands for 
> ransatlantic signals. This remailer was an idea before a reality for > a while. I 
> ope it helps get a signal recieved across the Atlantic. 
> Most of all we need subscribers from both sides of the Atlantic, and > South 
> merica and Africa, and from all the islands in between. 
> We are up to 15 subscribers in 1 day. Bob, K4ESA is the first > subscriber to test 
> he remailer a few minutes ago. And, congrats to Dave, N7BHC, for > being the 
> irst subscriber only 14 minutes after the annoucement was sent out > yesterday! 
> ex, W4DEX was a close second, only 1 minute after Dave. At last > April's South 
> ast VHF Society Conference, in Charlotte, NC, Dave made 2 different 
> resentations, both on subjects relating to transatlantic VHF > communication. His 
> alks were voted as the best of the conference. So, as shown by > Dave's talks, 
> hen it is presented to the VHF/UHF ham community, the subject of a > possible 
> ransatlantic qso is interesting to quite a few weak signal > enthusiasts. 
> Scientific theoretical, predicted, and actual propagation disussions > and 
> bservations will be welcomed on this remailer. For example, a > subject like, 
> How different propagation modes might work together to complete a > path from 
> orth America to Europe", would be a very good one. 
> This remailer will probably not be very busy, unless some > propagation starts to 
> appen. Interestingly enough, if you take a look at William Hepburn's > North 
> tlantic map for yesterday, Tuesday, Nov., 10th, the first day of the > remailer's 
> xistence, with the exception of a very narrow distured area mid-way, > there was 
> redicted an area reaching across of mild enhancement from the > Southeast US 
> oast to Spain and Portugal. 
> Initially the list is set at a maximum message size of 20kb. That > will let you 
> nclude most original messages in a reply, if desired. But, you might > want to 
> ut off some of the longer original messages in a lengthy reply. 
> Please listen for the transatlantic beacons: 
> A1ZMS, FM07fm, Virginia, west of Lynchburg, 144.285 
> 7BHC, FM15pa, Oriental, Pamlico County, NC, (about 60-70 miles south > west of 
> ape Hatteras), 144.291 
> 4MHZ, FM25df, Hatteras (town),near Cape Hatteras, NC, 144.300 
> 73 
> ark Casey, K1MAP 
> _____________________________________________________________ 
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