Search found 3139 matches

by Deep Thought
Mon Jul 24, 2017 9:18 am
Forum: Everything else
Topic: You need this
Replies: 22
Views: 707

Re: You need this

Shane wrote:
Mon Jul 24, 2017 12:03 am
IIRC, the freq response improved!
You probably RC. One of those on each end converting from 600 ohms to 150 and back was an "old" trick to get better freq. response out of a dry pair. 8)
by Deep Thought
Tue Jul 18, 2017 9:44 pm
Forum: Everything else
Topic: You need this
Replies: 22
Views: 707

Re: You need this

Bill DeFelice wrote:
Tue Jul 18, 2017 7:08 pm
Just like the guys who use the monster thick speaker cable who forget just how small the pc traces are between the amplifier's output and the speaker terminals.
There is some legitimate physics behind the large gauge speaker cable...if you have 500 foot runs. :lol:
by Deep Thought
Wed Jul 12, 2017 11:56 am
Forum: FM Radio
Topic: Any opinion on MACHLETT transmitter tubes.
Replies: 6
Views: 293

Re: Any opinion on MACHLETT transmitter tubes.

Pretty sure Varian bought them around 1990.
by Deep Thought
Mon Jul 10, 2017 10:58 pm
Forum: Everything else
Topic: Harris MSP 100
Replies: 2
Views: 152

Re: Harris MSP 100

It was Harris' attempt at the then-state of the audio multiband processing art and they charged accordingly, around $5,600 back when you could still buy a new car for that. I know of a couple AM stations that ran them and they sounded OK, but never were able to compete with Optimods. It is a bit of ...
by Deep Thought
Mon Jul 10, 2017 10:23 pm
Forum: AM Radio
Topic: Daytime Impedance high?
Replies: 26
Views: 1466

Re: Daytime Impedance high?

That is a very non-critical part of the circuit, forming a power divider based on roller position on the coil and the ratio between the "top" and "bottom" parts. You may notice a small difference in phase (<5°) due to the slightly different coil value and it'll probably shift the common point tuning...
by Deep Thought
Thu Jul 06, 2017 1:57 pm
Forum: FM Radio
Topic: Static Dissipators?
Replies: 13
Views: 673

Re: Static Dissipators?

In my Southern Illinois youth we observed a lightning bolt ignoring at least a half dozen 30-foot TV antenna towers, three different power lines, a couple dozen tall-ish (30-40 foot) trees within about 250 feet of the gas line under a ditch full of water it had some sort of vendetta against. Up from...
by Deep Thought
Tue Jul 04, 2017 1:40 pm
Forum: FM Radio
Topic: Static Dissipators?
Replies: 13
Views: 673

Re: Static Dissipators?

First off, I wouldn't trust anything from someone running a "lightning protection company". The NFPA usually involves itself with writing standards for fire prevention, and one of the big deals in industrial circles is prevention and dissipation of static charges on equipment and nearby surfaces to ...
by Deep Thought
Mon Jul 03, 2017 9:34 pm
Forum: AM Radio
Topic: Look what took my 50kw off the air
Replies: 4
Views: 364

Re: Look what took my 50kw off the air

I once spent the better part of four hours troubleshooting an intermittent VSWR fault Nautel XR-12 only to find a toasted spider in the arc gap. I feel your pain. 8)
by Deep Thought
Thu Jun 29, 2017 12:22 pm
Forum: Ask the Engineers
Topic: How to find tower rental tenants?
Replies: 2
Views: 177

Re: How to find tower rental tenants?

If it isn't in the FCC ASRN database, register it even if it doesn't appear to need registration. That's where most of the tower databases draw from. Rates and "extras" like floor space and electric service can be negotiated. It'll depend on what the tower can support as well. A Rohn 45 isn't going ...
by Deep Thought
Thu Jun 22, 2017 10:05 am
Forum: AM Radio
Topic: Daytime Impedance high?
Replies: 26
Views: 1466

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: 26
Views: 1466

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: 26
Views: 1466

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: 148
Views: 7263

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)