[CRTech] Christian Radio Tech [MSG 83955]
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Re: RE: AM Power level question to the Oracle....
To: CRTech <crtech@crtech.org>
Subject: Re: RE: AM Power level question to the Oracle....
From: KBGN AM <kbgn@kbgnradio.com>
Date: Sun, 30 Sep 2018 18:58:02 -0600
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In-reply-to: <45bc01d45915$1653e850$42fbb8f0$@aol.com> <77e55edd-8a24-f7d6-2637-a92a0d494c5e@munn-reese.com>
References: <000001d4584f$5b4b28e0$11e17aa0$@aol.com> <9b1bb1b75cfb8b1066534923c36d03a0@knlr.com> <CAHL64sGreyN0+ozmcbSHawKPU7-jhr+zQ2yMYKeFmJ-r2YTWLw@mail.gmail.com> <77e55edd-8a24-f7d6-2637-a92a0d494c5e@munn-reese.com>
Here at KBGN, to complement our 10kW daytime power, we are allowed 250W PSA and a monthly varying power for the first hour after sunset; then 58W for the second and final hour after sunset, making for a total of about 13 different power levels throughout the year. We could use fewer power levels by sacrificing maximum allowable le els for some months, but we squeeze out every puny watt. Unfortunately, the Commission hasn't seen the need to modify the antiquated and no longer necessary clear channel rules to allow daytime stations like ours to push harder against the 50kW priority signals at night.

I use a Sine Systems transmitter controller communicating with a homebrew software program via dedicated phone line to automatically control the power levels. The software, which reprograms certain memory locations daily, must have data files updated one or more times a year to stay current. There are no 'fancy dancy' interface displays, but it has automatically set, monitored and adjusted power levels for two transmitters since 2004, making unattended operation possible.

Incidentally, I have had numerous DX reports from Scandinavia while operating at those 'flea powers'.

Nels Wilson

On Sep 30, 2018 at 5:26 PM, <Bill> wrote:

This station is a Class D




From: Ed Trombley [mailto:ETrombley@munn-reese.com]
Sent: Sunday, September 30, 2018 2:58 PM
To: crtech@crtech.org
Subject: Re: [CRTech] AM Power level question to the Oracle....


Hello This is Thumbs Feebleman:

I am not an Oracle.  I am an FCC Theologian.  If you do not get my sporadically published newsletter, it is time to start, Thumbs@Munn-Reese.com

First item you need in an old gray haired consulting engineer who understands AM radio.  A consulting engineer is someone who has trained him or herself to do quickly and accurately things that a broadcast station my request only once or twice in a lifetime.  Been there and done that.

On the topic of Pre Sun Rise Authority (PSRA) and Post Sun Set Authority (PSSA), as far as I know it can still be done if the station meets certain requirements.

The big advantages are for class D, daytime stations with peanut power at night.  It also depends on what channel your operating on.  Class B stations have options too.

The rules state that the station just has to request PSA or PSSA operation from the AM branch at the FCC.  The last I remember and it has been several years.  The AM guys at the FCC came back and said, “Go hire a consulting engineer and have him do the calculations”.  We did and helped the local class B station get PSA at 500 watts non-directional at 6:00 AM.  The 500 watts during January covers much more of the county than the 1000 watts does into the three tower nighttime array.

I could blab all day and you would learn little.  

So!  Here comes your homework.

Find www.FCC.gov

Find 47 CFR.

Find parts 70 to 79.

Find and study 73.99 of the rules. You could just find an old consultant.

Thank you! 




On 9/30/2018 3:31 PM, Kevin Kidd wrote:

The flea power levels are still valid as long as you have the original document sent by the FCC.  I have been told that the FCC no longer has the software to generate those documents and do not have most of them on file for stations...


Terry, back in the 80's, the FCC automatically granted very low night powers to many daytimers.  The power was calculated to cover the CoL at some percentage of interference via skywave.  I don't recall the exact methodology as I was just a wet behind the ears wire fixer at the time...


Most of the powers were down in the sub-100w but I have a few clients that have several incremental powers that change with time after sunset.




Kevin C. Kidd, CSRE/AMD
Lawrenceburg, TN
AM Ground Systems Company  -  WD4RAT
kkidd@kkbc.com  --  866-22-RADIO -- 866-227-2346



On Sun, Sep 30, 2018 at 2:52 AM <tcowan@knlr.com> wrote:

I was not aware of the multi level post sunset. There were pre-sunrise and critical hours as I recall. But more importantly, you should follow whatever the license says
Terry Cowan

September 29, 2018 4:52 PM, "Bill" <mrradiodad@aol.com> wrote:

Back in the 80’s, the FCC granted flea power at night to a lot of daytime AM’s. At that time they issued licenses with multiple steps of power starting at local sunset, eventually getting down to the authorized flea power overnight. I note that more recent issuing’s of the licenses only show the final low power, not the interim steps.

So, the great question is, are those intermediate power levels Post Sunset and Pre Sunrise still valid?

Bill Glenn

American Christian Network



Follow-Ups: Re: RE: AM Power level question to the Oracle....
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Re: RE: AM Power level question to the Oracle....
(Mike Shane <somethingorother@cox.net>, 3 Oct 2018 04:22:03 -0000)
References: AM Power level question to the Oracle....
("Bill" <mrradiodad@aol.com>, 29 Sep 2018 23:51:46 -0000)
Re: AM Power level question to the Oracle....
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Re: AM Power level question to the Oracle....
(Kevin Kidd <kkbroadcastengineering@gmail.com>, 30 Sep 2018 19:31:32 -0000)
Re: AM Power level question to the Oracle....
(Ed Trombley <ETrombley@munn-reese.com>, 30 Sep 2018 21:58:36 -0000)
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