Search found 3129 matches

by Deep Thought
Thu Jun 22, 2017 10:05 am
Forum: AM Radio
Topic: Daytime Impedance high?
Replies: 21
Views: 913

Re: Daytime Impedance high?

Deep: Thanks for the update re coil parts from Gates Air. Good thing I got some spares on hand for those coils, and two spare coils. Now you got me wondering about the motorized contactor parts. Only got a couple fingers left for them. :( Fossil I had the same experience. The "incident" in Palm Spr...
by Deep Thought
Wed Jun 21, 2017 3:29 pm
Forum: AM Radio
Topic: Daytime Impedance high?
Replies: 21
Views: 913

Re: Daytime Impedance high?

Fossil,

When we contacted GatesAir about a replacement coil following the flame-out this spring they referred us to Kintronic Labs. They no longer have any parts or complete units.
by Deep Thought
Tue Jun 20, 2017 2:08 pm
Forum: AM Radio
Topic: Daytime Impedance high?
Replies: 21
Views: 913

Re: Daytime Impedance high?

If it is one of those Harris coils with the wiper riding the side of the ribbon coil, welcome to the club. I've had clients in two different states with Harris phasors of similar vintage have those go up in flames for no reason other than bad design. Phasetek also makes variable coils, but their pri...
by Deep Thought
Mon Jun 19, 2017 6:34 pm
Forum: Ask the Engineers
Topic: Offical AMC 8 Transition Thread (was Sat. AMC-8)
Replies: 135
Views: 6128

Re: Offical AMC 8 Transition Thread (was Sat. AMC-8)

Jim Sofonia wrote:
Mon Jun 19, 2017 5:22 pm
Ummnn.. Would the crow have anything to do with your loss? :)
Looks like it is pointed right at the bird to me. 8)
by Deep Thought
Sat Jun 17, 2017 10:43 pm
Forum: Ask the Engineers
Topic: Gates harris 55 cart automation and more
Replies: 1
Views: 76

Re: Gates harris 55 cart automation and more

Those multi-cart machines aren't worth much except to maybe a museum. If you have a list of what you have and photos if possible we can probably help you at least get an idea of what you are sitting on.
by Deep Thought
Sat Jun 17, 2017 10:33 am
Forum: AM Radio
Topic: RFI-Resistant USB Audio Interface
Replies: 6
Views: 279

Re: RFI-Resistant USB Audio Interface

Have you tried a 600:600 ohm isolation transformer? If placed at the computer that should take care of the problem (unless the RFI is in the computer itself). It'll also help protect the computer from the inevitable lightning surge which the stick-on will not.
by Deep Thought
Thu Jun 15, 2017 9:10 pm
Forum: AM Radio
Topic: Daytime Impedance high?
Replies: 21
Views: 913

Re: Daytime Impedance high?

I am wondering about the bonding of the sample loop cable to the tower. What bonds I see do not look like they are to actual metal more to paint. Thinking about adding a sample loop bond right at the output of the ATU. Since it changes with rain this is definitely where I'd look. Bonding the line t...
by Deep Thought
Tue Jun 13, 2017 11:18 pm
Forum: AM Radio
Topic: Chain link fence
Replies: 5
Views: 299

Re: Chain link fence

Also, if you run a continuous wire through steel mesh you're looking for trouble with dis-similar metals in contact and the effects of oxidation on the two materials. That's why you use the same galvanized wire the fence companies use to secure the top and bottom parts of the chain link. It may be ...
by Deep Thought
Tue Jun 13, 2017 11:46 am
Forum: Internet Streaming
Topic: Streamer PC hit by ransomware
Replies: 7
Views: 283

Re: Streamer PC hit by ransomware

If it is (was?) connected directly to DSL and the ISP does not filter things like NetBIOS ports it was probably a sitting duck since all of the LAN protocols would be exposed to the public. This is definitely a no-no.
by Deep Thought
Tue Jun 13, 2017 11:42 am
Forum: AM Radio
Topic: Chain link fence
Replies: 5
Views: 299

Re: Chain link fence

Depending on the frequency involved, the tower height and how close the fence is to the tower you may need to ground it more often, but the corners and midway between them is a good start. Definitely make sure that there is a horizontal wire run through the entire fence and that it is grounded to th...
by Deep Thought
Mon Jun 12, 2017 5:07 pm
Forum: Internet Streaming
Topic: Streamer PC hit by ransomware
Replies: 7
Views: 283

Re: Streamer PC hit by ransomware

Is the public-facing port behind a firewall or just connected to DSL? It's damn near impossible to inject something into a computer you can't get at.
by Deep Thought
Fri Jun 09, 2017 9:45 am
Forum: FM Radio
Topic: FM transmitter causing significant hum in surround components
Replies: 9
Views: 489

Re: FM transmitter causing significant hum in surround components

I would suggest you buy a 50 ohm dummy load and operate this transmitter into that instead of an antenna. Enough signal will still "leak out" for you to receive it in your home, and you can experiment with whatever you are doing without causing interference for a mile radius. This isn't the 1970s wh...
by Deep Thought
Thu Jun 08, 2017 2:29 pm
Forum: FCC Discussion
Topic: translator window
Replies: 2
Views: 143

Re: translator window

This is a true auction window (#99), and all applications filed during those seven days will be considered filed simultaneously. As mentioned, only minor changes will be acceptable for MX resolution. The translator is permanently married to the AM. Only the AM licensee/permittee can file (no side ag...
by Deep Thought
Thu Jun 08, 2017 2:25 pm
Forum: FM Radio
Topic: FM transmitter causing significant hum in surround components
Replies: 9
Views: 489

Re: FM transmitter causing significant hum in surround components

That antenna has no ground plane, so anything around it turns into one and "collects" the RF. If your audio wiring is in the vicinity (1-2 feet) it becomes the ground plane and RF is flowing through it causing the hum. There is no way to fix this other than proper construction techniques.