Search found 114 matches

by Lee_Wheeler
Sat Nov 05, 2016 6:39 pm
Forum: FM Radio
Topic: Theory Discussion: Circular Polarization Vs. Vertical Polarization
Replies: 46
Views: 4302

Re: Theory Discussion: Circular Polarization Vs. Vertical Polarization

LPFMs, like all stations save some really old grandfathered old 10 watt Class D NCEs, are licensed by ERP, not TPO. Other than some NCE's that had channel 6 television interference problems all FM stations are licensed in the horizontal plane with the choice to have power in the vertical plane such ...
by Lee_Wheeler
Thu Nov 03, 2016 6:39 pm
Forum: AM Radio
Topic: Combining two AMs at one site
Replies: 24
Views: 3075

Re: Combining two AMs at one site

1550 was the array to the South-East of town and it was in horrible shape. They blew a capacitor in one of the ATUs and it took me all day with a chain saw to get to the door on the tuning unit to get in and fix it. As soon as I opened the door it fell off of the hinges. 1550 took a hit in coverage ...
by Lee_Wheeler
Wed Nov 02, 2016 10:47 pm
Forum: AM Radio
Topic: Combining two AMs at one site
Replies: 24
Views: 3075

Re: Combining two AMs at one site

Did you make sure the guy mowing the grass can't take out the new towers like he did on the end tower of the 680 array? :mrgreen: This time we built fences off of the ends of the anchor points. As far as I know they still bale the hay though - a few hundred dollars a year to the beer fund. :D It wa...
by Lee_Wheeler
Tue Nov 01, 2016 8:48 pm
Forum: AM Radio
Topic: Combining two AMs at one site
Replies: 24
Views: 3075

Re: Combining two AMs at one site

I did an interesting one a few years ago where we moved a DA on 1550 into the space between the towers on a DA that was on 680. It wasn't really diplexed but it might as well have been. We stuck a 4 tower 1550 parallelogram in the 1/2 wave space between the towers on the 680 array. The MoM proof was...
by Lee_Wheeler
Sat Oct 22, 2016 5:43 pm
Forum: FM Radio
Topic: Scala FM Antennas
Replies: 8
Views: 1271

Re: Scala FM Antennas

The thing I hate about them is that the Commission licenses them as though they were in a vacuum and they only reference the spec. sheet pattern, no matter how it is oriented with respect to the tower. I have used that to my advantage for clients but I have also had clients get creamed by interferen...
by Lee_Wheeler
Thu Oct 20, 2016 3:51 pm
Forum: Ask the Engineers
Topic: FM radio with excellent selectivity needed
Replies: 13
Views: 1862

Re: FM radio with excellent selectivity needed

Back in the RPU days (Marti remotes were a big reason why I quit being a chief engineer years ago) I had a Crown FM2 in the remote motorhome and it was bulletproof. Now that all of the remotes are done with Comrex units it was safe for me to go back to being a chief engineer again but many of the tu...
by Lee_Wheeler
Thu Oct 06, 2016 4:51 pm
Forum: Radio Studio Engineering
Topic: Spacing XDS units in a rack?
Replies: 4
Views: 747

Re: Spacing XDS units in a rack?

I leave 1 RU between units but I don't know that it is necessary. If you do stack them they should be able to get plenty of air from the sides and an unobstructed air flow out the back of the rack. I have them in a set of racks without open air between the rack units rather than sides and I took the...
by Lee_Wheeler
Tue Oct 04, 2016 1:11 pm
Forum: FM Radio
Topic: Gates Air Flex20 vs. Nautel NV20lt
Replies: 16
Views: 2330

Re: Gates Air Flex20 vs. Nautel NV20lt

Update:

Nautel shipped my client a new VS2.5 and it was installed last night by the local staff with no drama at all. Up and running great and we will see if it stays that way - my bet is that it will be trouble free for years to come.

...Lee
by Lee_Wheeler
Thu Sep 29, 2016 4:42 pm
Forum: FM Radio
Topic: Gates Air Flex20 vs. Nautel NV20lt
Replies: 16
Views: 2330

Re: Gates Air Flex20 vs. Nautel NV20lt

The station in question is about 250 miles away from me and I have not been directly involved in the conversations and I have not actually had the opportunity to replace any of them myself. Based on the verbal description I am going to say that they just short out without visible damage but I can't ...
by Lee_Wheeler
Wed Sep 28, 2016 5:08 pm
Forum: FCC Discussion
Topic: Any word on the length of the pending NPT?
Replies: 25
Views: 2511

Re: Any word on the length of the pending NPT?

The Form Two went easy for me as well. My fear was the Commission servers not being up to the task. I logged in right at 4:00 PM Central and there were no delays at all except for failing to check the certification box on my part on the first station. I think staggering the reporting by time zone li...
by Lee_Wheeler
Wed Sep 28, 2016 4:54 pm
Forum: FM Radio
Topic: Receive antenna height for translator
Replies: 29
Views: 3301

Re: Receive antenna height for translator

Without specifics it is difficult to give a good answer. The variables are distance, terrain, and interference from other stations. In general, you want to go at the lowest height that will reliably get the job done. More height, beyond what gets (more or less) line of sight, just results in more li...
by Lee_Wheeler
Wed Sep 28, 2016 1:23 pm
Forum: FCC Discussion
Topic: Any word on the length of the pending NPT?
Replies: 25
Views: 2511

Re: Any word on the length of the pending NPT?

So all information on the length of the test was wrong. Ours clocked in at 28 seconds for the message and was not bilingual as had been advertised. No drama whatsoever and it was nice that we knew it was coming so that we could shift the :20 break and not blow up a spot set. Now the next phase of fu...
by Lee_Wheeler
Wed Sep 28, 2016 1:00 pm
Forum: Production Studios
Topic: My old R16 Audioarts console has lost a Mic module!
Replies: 2
Views: 802

Re: My old R16 Audioarts console has lost a Mic module!

Short of the module catching on fire it should be repairable. I typically have problems with the Program and Audition on the Wheatstone / Audioarts consoles of that vintage and, as far as I know, you can still buy any part from Wheatstone other than the complete modules or the motherboard. Have you ...
by Lee_Wheeler
Wed Sep 28, 2016 12:36 pm
Forum: FM Radio
Topic: Gates Air Flex20 vs. Nautel NV20lt
Replies: 16
Views: 2330

Re: Gates Air Flex20 vs. Nautel NV20lt

Curious about your transmitter story, Lee. Nautel has specific grounding designed for their transmitters...at least the GV40. It is a single point on the back of the cabinet that is isolated from the cabinet. They tell you ground at this point only. (Obviously, the transmission line is also grounde...
by Lee_Wheeler
Tue Sep 27, 2016 8:39 pm
Forum: FM Radio
Topic: Gates Air Flex20 vs. Nautel NV20lt
Replies: 16
Views: 2330

Re: Gates Air Flex20 vs. Nautel NV20lt

I am similarly situated and at some point I am going to have to replace my circa '81 to '87 fleet of Continental and Harris transmitters. I do a fair amount of contract installation work and my installations tend to track what my local RF Specialties shop is offering. For 20 years or so it was almos...