[BC] LPAM (was Smallest AM Radiator/TIS)

Fri Jul 14 10:35:06 CDT 2006

Hi Scott,

I know Keith fairly well and like his transmitters, I use 6 of them
here.  HE isn't modifying anything, but there are some issues with the
definition of 'ground' and 'ground lead' that are being stretched by
some users...  It's the 'installed properly' part that is the issue. 
The transmitters are (a) certified, (b) recently retested by the FCC,
and most importantly were (c) certified with a synch port on them. 
They're probably the best thing on the market.  My point is that you can
easily make a transmitter non-compliant, whether it's forgetting to drop
to Post-Sunset power levels on your commercial operation, or building a
huge ground plane for your Part 15 operation.  I'm suggesting that the
USER is the problem in this case, not the manufacturer.  15.219 allows a
3m ground lead and antenna TOTAL length.  If someone uses the standard
102" Radio Shack whip, they are not going to be allowed to build a set
of 100ft radials into a ground plane as well ;)  5 miles doesn't happen
under Part 15.

John

>>> "Bailey, Scott" <SBailey at nespower.com> 07/14/06 11:17 AM >>>
John,
   I'm just going by what Keith Hamilton told me on the phone.  I
don't
think he or his users modified anything to achieve getting the
coverage
his customers gets. He claims his transmitter, if installed properly
meets part 15 rules, so this would be a debate between you and Keith.
I've never have really done much experimentation with this, so it's
out
of my league.

Scott

-----Original Message-----
From: broadcast-bounces at radiolists.net 
[mailto:broadcast-bounces at radiolists.net] On Behalf Of WLOYPROD
WLOYPROD
Sent: Friday, July 14, 2006 10:06 AM
To: Broadcasters' Mailing List
Subject: RE: [BC] LPAM (was Smallest AM Radiator/TIS)

Scott,

You can't legally (a) change the antenna or (b) use a ground system
with the 100mW units... both violate the Part 15.219 regs and the
certification on the unit.  What you can do, and many folks are doing,
is use more than one transmitter and synchronize them using the
built-in
synch ports and a GPS system.  You can't really get 5 miles from one
transmitter LEGALLY, in any configuration, from any company, under
Part
15.  Tubes or not.

John

>>> "Bailey, Scott" <SBailey at nespower.com> 07/12/06 8:08 AM >>>
Paul,
  I talked to Keith Hamilton on the phone, and he has some clients
that
are getting up to 5 miles with his box.  You have to know what you're
doing to make it work. I know of one guy getting good coverage using
an
Omnia 3 processing, with a simple unipole type antenna and ground
system.
  I wished you could have met the late James Cunningham out Ada, Ok. I
didn't agree with using tubes, but James used a scheme that made part
15
get out 5-6 miles just using whip antennas.

Scott

-----Original Message-----
From: broadcast-bounces at radiolists.net 
[mailto:broadcast-bounces at radiolists.net] On Behalf Of Paul B. Walker,
Jr.
Sent: Tuesday, July 11, 2006 9:59 PM
To: Broadcasters' Mailing List
Subject: Re: [BC] LPAM (was Smallest AM Radiator/TIS)

Scott:

The AM1000 Rangemaster does nowhere near what a TIS does.

If the AM1000 is tuned properly and has some processing behind it, 
it'll get out about 1 mile soild in fair ground conductivity.

If a TIS was tuned properly, had an efficent antenna and the audio 
was better, it'd get out 5+ miles solid in decent groundcondiuctivity
areas.

Paul

On 7/11/06, Bailey, Scott 
<<mailto:SBailey at nespower.com>SBailey at nespower.com> wrote:
Come to think of it, with this crazy petition that is out about LPAM,
why not give these people stations with 5-10 watts, or the field
strength limit of 2 mv/m @ 1.5 km, with an antenna no more than
10-15'.
In rural areas, or small towns with no local AM station, that's plenty
to cover a small town, and even cover a high school football game.
IMHO...despite what some say, it's not going to cause nighttime
interference. I know Powell Way on this list will debate me tooth and
nail on this, but if that is the case, then Keith Hamilton's
Rangmaster
1000, Part 15 box should be outlawed as well. It does almost as much
as
the TIS station's transmitter and antenna system. Now this idea would
serve a small community!

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