Search found 84 matches

by W9PXZ
Thu Oct 17, 2019 6:29 am
Forum: FM Radio
Topic: ARC-16 problem
Replies: 3
Views: 554

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: 701

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: 530

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: 701

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: 530

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: 530

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: 701

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: 424

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: 424

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: 672

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...
by W9PXZ
Wed Jul 17, 2019 8:08 pm
Forum: Ask the Engineers
Topic: Cutting Hard Line
Replies: 12
Views: 456

Re: Cutting Hard Line

Thanks, guys. I didn't mind the tubing cutters on 1 5/8". Just keep a light touch so as not to flare the cut inward as stated. I was not aware they made them big enough to do 3", so I have some shopping to do. If I can find one that is reasonably priced, that would change my mind on the band saw. I'...
by W9PXZ
Tue Jul 16, 2019 8:01 pm
Forum: Ask the Engineers
Topic: Cutting Hard Line
Replies: 12
Views: 456

Cutting Hard Line

I've been away from the board for a long time, but I'm back with a new job and a new location. I have a project next month installing a new GatesAir FAX40 transmitter. I have spent the last 14 years taking care of nothing but small class A's and this is my first big boy TX that I have had the opport...
by W9PXZ
Wed Dec 02, 2009 7:52 pm
Forum: Ask the Engineers
Topic: Sparta AS-30B audio console
Replies: 4
Views: 1719

Re: Sparta AS-30B audio console

I might be able to help you with that. I have an old Sparta sitting in the basement. Not sure the model, but i will check the next time i am there. If that does not work out, I may have a supply that will work. What voltages and current do you need? I found a few old supplies in cleaning out a forme...
by W9PXZ
Mon Nov 23, 2009 10:09 pm
Forum: Ham Radio
Topic: W9C operating at former WKKD this Friday
Replies: 3
Views: 1675

W9C operating at former WKKD this Friday

Short commercial: :) Chicago Suburban Radio Assoc. will be out at the former WKKD site in Aurora, IL this Friday the 27th making use of the 160' towers and operating as W9C to commemorate the 85th anniversary of the club's 1st meeting. CSRA is the oldest ham radio club in IL. All are welcome to stop...
by W9PXZ
Thu Nov 19, 2009 11:20 pm
Forum: General Computers
Topic: Web Server
Replies: 9
Views: 1597

Re: Web Server

Thanks for all of your suggestions and offers of assistance. I might just take you up on that. This will be a winter project for me. I have a number of irons in the fire right now and as soon as I get those projects wrapped up, this will be a fun project to do when it is too cold to go outside. Adam...