Search found 89 matches

by W9PXZ
Thu Apr 02, 2020 10:20 pm
Forum: FM Radio
Topic: OMB Exciter EM 50
Replies: 7
Views: 241

Re: OMB Exciter EM 50

I bought one of these. Nicely made unit.

https://www.ebay.com/itm/New-Compact-25 ... 4591798501
by W9PXZ
Thu Apr 02, 2020 9:44 am
Forum: FM Radio
Topic: Harris HT5 IPA replacement
Replies: 11
Views: 277

Re: Harris HT5 IPA replacement

I ran a HT5 at my former job that way for many years. Needed 3,800 watts TPO and 125-150 watts drive from a Nautel VS series did just the trick. The drive required varies with the tube a bit. Use the exciter mute control line to enable the output with the plate supply. Ran it that way until it was r...
by W9PXZ
Fri Mar 20, 2020 6:46 pm
Forum: AM Radio
Topic: Burk ARC-16 ESI Card
Replies: 14
Views: 1944

Re: Burk ARC-16 ESI Card

Alan, I emailed you a set.

If anyone else needs them, drop me a note.
by W9PXZ
Tue Mar 10, 2020 5:21 pm
Forum: AM Radio
Topic: Advice on refurbing an Optimod 9100
Replies: 1
Views: 175

Advice on refurbing an Optimod 9100

I have an Optimod 9100 still doing main duty here that has developed the dirty pot syndrome. Just putting your finger on a control makes a nice scratchy sound on the air and levels jump all over by themselves. I figure if I am going to pull it and fix it, I might as well plan on replacing the 30 yea...
by W9PXZ
Thu Feb 27, 2020 6:52 pm
Forum: Production Studios
Topic: Small and robust sound card. Recommendation?
Replies: 2
Views: 455

Re: Small and robust sound card. Recommendation?

In PCI/PCIe interfaces and not spending the big bucks for a pro card like an ASI, look at the Asus Xonar series. I have good luck with them. The are unbalanced I/O though. Available in sizes to fit a small form factor case. I have been using the Focusrite Scarlett USB devices of late. Put one in our...
by W9PXZ
Thu Oct 17, 2019 6:29 am
Forum: FM Radio
Topic: ARC-16 problem
Replies: 3
Views: 571

Re: ARC-16 problem

By chance would you still be using the original ribbon cables between the interface panels and the main unit? I have had a few where the crimp on connectors got just enough corrosion after 25+ years on the IDC "forks" that erratic operation was the norm. Replaced them with some generic DB37 cables a...
by W9PXZ
Mon Sep 09, 2019 9:50 pm
Forum: FM Radio
Topic: FM Antenna Tuning
Replies: 11
Views: 734

Re: FM Antenna Tuning

Just to update the thread, this Saturday we'll pull the top bay to the ground to make repairs of a lightning hit that ripped a hole in the bay. I'll shut down the other class C that has the antenna located directly underneath this one and take some measurements with my SA/VSWR bridge combo both befo...
by W9PXZ
Mon Aug 26, 2019 7:04 pm
Forum: AM Radio
Topic: Replacing sample lines
Replies: 9
Views: 553

Re: Replacing sample lines

Thanks, folks. You gave me just what I needed. Sounds like LDF4 is the way to go if they need to be replaced. The TDR shows the bad spot in the cable is right about where it crosses the swamp, so I am betting on it being an actual bad cable, but it wouldn't hurt to swap the Delta TCT's and the short...
by W9PXZ
Mon Aug 26, 2019 6:36 pm
Forum: FM Radio
Topic: FM Antenna Tuning
Replies: 11
Views: 734

Re: FM Antenna Tuning

You may be on to something there, Kevin. The other station has a big gray ERI barrel sized filter in its line to pass its frequency and reject the other. This station has one of the filters, but it is not inline. Why it is not, I have no idea and no one is left that could answer that question. Both ...
by W9PXZ
Mon Aug 26, 2019 1:03 pm
Forum: AM Radio
Topic: Replacing sample lines
Replies: 9
Views: 553

Re: Replacing sample lines

The station is WAAV licensed to Leland, NC. It is 5 kW Non-D day and 3 towers night at the full 5 kW. The night pattern is a parabola pointing straight at Wilmington and out to the ocean. I am aware that all the sample lines must be the same electrical length, hence a buried vault at the rear of the...
by W9PXZ
Mon Aug 26, 2019 11:08 am
Forum: AM Radio
Topic: Replacing sample lines
Replies: 9
Views: 553

Replacing sample lines

I have a bad sample line to the reference tower on my 3 tower 5 kW DA. The existing line is Cablewave FCC38, no longer made and unobtanium. So what style of line would be best to replace it with considering cost, long term availability, and appropriateness to the use? I haven't been involved in a jo...
by W9PXZ
Mon Aug 26, 2019 10:53 am
Forum: FM Radio
Topic: FM Antenna Tuning
Replies: 11
Views: 734

FM Antenna Tuning

In the process of prepping the site to install a new GatesAir FAX40 I worked all day Saturday to remove an old patch bay, install a coax switch, install a BDI power monitor and switch controller, and re-plumb the retiring Continental back in. Ran on the aux site for the interim. After getting the Co...
by W9PXZ
Sat Aug 03, 2019 6:50 am
Forum: FM Radio
Topic: Omni FM with Parasitics?
Replies: 8
Views: 435

Re: Omni FM with Parasitics?

That would be some lucky shot! This bay is 990' up. Definitely lightning. This antenna is an ERI 8 bay for a class C1 about 20 miles out from the city of license and mounted on the tower face looking in that direction. It is an older install from about 1985. There is a breaker on the panel labeled f...
by W9PXZ
Tue Jul 30, 2019 7:45 pm
Forum: FM Radio
Topic: Omni FM with Parasitics?
Replies: 8
Views: 435

Omni FM with Parasitics?

I had a crew on the tower today finding an air leak. Turned out to be a lightning hole in the top antenna bay. But they were mentioning that this antenna which is licensed as an omni had 2 horizontal parasitics on each bay. The only reason I can think of that one might do that is to null out any eff...
by W9PXZ
Sun Jul 21, 2019 9:56 am
Forum: FM Radio
Topic: National brand tubes
Replies: 13
Views: 691

Re: National brand tubes

My colleague in the market for our competitor swears by the Nationals. He gets about the same life out of them as an average Econco rebuild for the same or less money. I tried a National 4CX15000A in a Continental 816R6C with "meh" results. Admittedly, the 4CX15000 is a marginal tube when you need t...