Search found 79 matches

by mbrockm
Mon Nov 27, 2017 10:00 am
Forum: Ask the Engineers
Topic: AM site and Solar arrays
Replies: 7
Views: 325

Re: AM site and Solar arrays

Center tower is 480 and outer towers are 240. Lots of land outside the radius of the towers. Several acres North and East of the array.
by mbrockm
Sun Nov 26, 2017 7:41 pm
Forum: Ask the Engineers
Topic: AM site and Solar arrays
Replies: 7
Views: 325

AM site and Solar arrays

Tossing an idea out there. Our AM 3 tower uses about 17 acres. I have wondering if some of the land could be used for a solar panel farm. There is a lot of southern exposure and a couple of miles from a midamerican energy substation. Several arces are outside the guy radius. The solar panel farms I ...
by mbrockm
Sun Nov 26, 2017 7:14 pm
Forum: Everything else
Topic: KYFR radio
Replies: 5
Views: 266

Re: KYFR radio

Got them up and running again. Full power day and night. A bit hit and miss with the RF switch control wiring with out a schematic. The replacement RF switches had different control wiring than the orginals.
by mbrockm
Mon Nov 20, 2017 5:25 pm
Forum: Everything else
Topic: KYFR radio
Replies: 5
Views: 266

Re: KYFR radio

Good to know there may be someone with documentation and at least some part of the company may still exist.
by mbrockm
Mon Nov 20, 2017 3:42 pm
Forum: Everything else
Topic: KYFR radio
Replies: 5
Views: 266

KYFR radio

Wondering if anyone knows anything about KYFR site, south of coin, Iowa. Its a four tower AM. Doing some work for them on the side to resolve problems with both RF and directional control wiring. I bit like exploratory surgery right now, blind folded. Need to find diagrams on the directional system ...
by mbrockm
Tue Sep 26, 2017 7:03 am
Forum: On-Air Studios
Topic: Phone Audio dropping
Replies: 2
Views: 197

Re: Phone Audio dropping

We have had other calls at the same time with no problem. The two factors seems to be weather eye and the time. We are going to try to use a flipping extensions to see if it is extension. We have tried changing who originates the call with no difference. I wish I could just them to change the times ...
by mbrockm
Mon Sep 25, 2017 10:08 am
Forum: On-Air Studios
Topic: Phone Audio dropping
Replies: 2
Views: 197

Phone Audio dropping

Not sure this the right forum. However I will post what is happening and see if anyone has an idea what is happening. At 6:45am and 7:45am exactly we are getting an audio drop on our calls with Weather eye. It only lasts at most 3 seconds and sounds like call waiting. We don't lose the call just the...
by mbrockm
Thu Sep 21, 2017 8:48 am
Forum: STL Engineering
Topic: Backup STL link
Replies: 8
Views: 1061

Re: Backup STL link

For that distance, I would think a 900 mhz data link on a couple of yagis would do the trick, even through some trees. Ubiquiti, or Mikrotik, and the like. I'm using Mikrotik radios diplexed into one of my STL paths, and it works great across the Sacramento metro out to south of rancho cordova. dav...
by mbrockm
Fri Aug 04, 2017 8:33 am
Forum: STL Engineering
Topic: Backup STL link
Replies: 8
Views: 1061

Re: Backup STL link

If you're just looking for a backup positive way to shut off the transmitter, why not use the squelch contacts on the STL receiver and connect it to one of the transmitter external interlock connections? Shut down the STL transmitter and off goes your broadcast transmitter. A good idea for a failsa...
by mbrockm
Fri Aug 04, 2017 8:30 am
Forum: STL Engineering
Topic: Backup STL link
Replies: 8
Views: 1061

Re: Backup STL link

jammerdave wrote:
Thu Aug 03, 2017 8:44 am
I'm using Mikrotik radios diplexed into one of my STL paths, and it works great across the Sacramento metro out to south of rancho cordova.
What model of MIkrotik are using? What did they cost?
by mbrockm
Thu Aug 03, 2017 8:07 am
Forum: STL Engineering
Topic: Backup STL link
Replies: 8
Views: 1061

Backup STL link

Looking for idea on a "cheap" backup link between our Studios and AM site for site control. Using Burk Arc SL plus. I am using a pair of 950 Marti STL 10 for audio. Transmitter control is thru DSL. We have had several DSL outages in recent months. The distance is about a mile and a half. Line of sit...
by mbrockm
Mon Jul 10, 2017 5:29 pm
Forum: AM Radio
Topic: Daytime Impedance high?
Replies: 26
Views: 2255

Re: Daytime Impedance high?

I got my replacement coil from Kintronics today. The old coil was a 6" outside diameter coil with 23 turns. The replacement from Kintronics is only a 5" outside diameter coil with 22 turns. The windings on both are 1" wide flat copper. Circuit wise the coil is across the common point and ground. The...
by mbrockm
Mon Jul 03, 2017 12:15 pm
Forum: AM Radio
Topic: Collins 310W-1 Exciter Divider
Replies: 20
Views: 1828

Re: Collins 310W-1 Exciter Divider

No luck finding any spares here for sn1147. Also looked thru my old digital logic books for the SN1147.Struck out. I am attaching a copy of the 310W instructions manual which has circuit descriptions if it helps. I think you are right that it some kind of jk flip flop. Problem is the 28 volt supply....
by mbrockm
Fri Jun 30, 2017 12:35 pm
Forum: AM Radio
Topic: Collins 310W-1 Exciter Divider
Replies: 20
Views: 1828

Re: Collins 310W-1 Exciter Divider

We have an 310w-1 exciter. My manual also indicates a SN1147 for z1 and z2. I will look and see if by chance we have any on the shelf. Also will check my old cross reference guides. You might try seeing if you can find a cross reference to for SN1147.
by mbrockm
Wed Jun 28, 2017 9:23 pm
Forum: AM Radio
Topic: Daytime Impedance high?
Replies: 26
Views: 2255

Re: Daytime Impedance high?

We will see what daylight shows tomorrow at KMA sites