Search found 65 matches

by ncradioeng
Wed Sep 25, 2019 2:45 pm
Forum: TV Engineering
Topic: TV OTA antennas
Replies: 9
Views: 586

Re: TV OTA antennas

Just saw off the last three or four directors.
by ncradioeng
Tue Jul 30, 2019 3:18 pm
Forum: FM Radio
Topic: Continental 816-R2 air chimney screws
Replies: 5
Views: 174

Re: Continental 816-R2 air chimney screws

I'm using the nylon thumbscrews (I think I got them from Lowes in the specialty hardware section). So far they seem to be working. Beats fiddling with a screwdriver since you have to install the rear ones by feel.
by ncradioeng
Thu Jul 18, 2019 11:33 am
Forum: Ask the Engineers
Topic: Cutting Hard Line
Replies: 12
Views: 366

Re: Cutting Hard Line

I've used a hose clamp as a cutting guide and a fine-tooth hacksaw. Takes a little time, but if you're only doing a couple of cuts, it works OK.
by ncradioeng
Mon Jul 08, 2019 3:02 pm
Forum: AM Radio
Topic: BE AM-6A RF Out Problem
Replies: 19
Views: 769

Re: BE AM-6A RF Out Problem

If the top PA power supply isn't working, the transmitter will not come on. BTDT. I can't remember if one of the fuses was blown associated with that power supply or what, but there were no faults showing and I was going in circles until B-E made the comment concerning the situation with that supply.
by ncradioeng
Mon Jul 08, 2019 8:05 am
Forum: AM Radio
Topic: BE AM-6A RF Out Problem
Replies: 19
Views: 769

Re: BE AM-6A RF Out Problem

If the PA power supply at the top of the rear cabinet has an issue, that can cause strange things to happen. You might try swapping it with one of the other supplies and see what happens.
by ncradioeng
Tue Apr 09, 2019 9:37 am
Forum: FM Radio
Topic: Gotta love Westwood One
Replies: 16
Views: 1307

Re: Gotta love Westwood One

Ah yes, the infamous "Wone Cue". I also have an official CBS Radio NetAlert test record for troubleshooting their decoders. Back in the "bee-doop" cue tone days of Westwood One, they used to sell an all-in-one tone decoder. It would handle bee-doops, DTMF, subaudible tones, NBC cue tones, dog whistl...
by ncradioeng
Wed Mar 06, 2019 11:27 am
Forum: Everything else
Topic: Making a case for factoring malicious use of potent energy
Replies: 11
Views: 732

Re: Making a case for factoring malicious use of potent energy

Leon Theremin, inventor of the musical instrument, also invented "The Thing" - A passive Soviet listening device placed in the ambassador's office during the Cold War:

https://en.wikipedia.org/wiki/L%C3%A9on_Theremin

Scroll down to "Espionage".
by ncradioeng
Thu Jan 10, 2019 11:34 am
Forum: Ask the Engineers
Topic: AMP connector info needed AudioArts console
Replies: 9
Views: 391

Re: AMP connector info needed AudioArts console

I believe the Arrakis uses Molex connectors.
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by ncradioeng
Thu Jan 03, 2019 2:22 pm
Forum: Radio Studio Engineering
Topic: Unit or circuit to properly convert stereo to mono for AM Tx is ?
Replies: 8
Views: 345

Re: Unit or circuit to properly convert stereo to mono for AM Tx is ?

RDL makes these - STA-1 stereo amp https://www.rdlnet.com/product.php?page=54 STA-1M mono amp https://www.rdlnet.com/product.php?page=55 I would think there would be enough reserve input gain on your audio processor to make up for the combiner circuit loss. It may have an input pad that can be set f...
by ncradioeng
Wed Dec 12, 2018 8:06 am
Forum: FM Radio
Topic: High Reflected Power Puzzle
Replies: 33
Views: 1617

Re: High Reflected Power Puzzle

How far is the transmitter from the antenna? If there is poor shielding in the TX, you might have an RF feedback situation causing some issue.
by ncradioeng
Mon Nov 05, 2018 3:42 pm
Forum: AM Radio
Topic: RF Ammeter resistance
Replies: 15
Views: 869

Re: RF Ammeter resistance

Maybe it got a lightning hit.
by ncradioeng
Fri Nov 02, 2018 2:08 pm
Forum: AM Radio
Topic: RF Ammeter resistance
Replies: 15
Views: 869

Re: RF Ammeter resistance

It doesn't take more than a second or two for the thermocouple to cool down to ambient after the current is removed. A thermocouple works by using dissimilar metals in contact at different temperatures so no current is generated when all the parts are at the same temperature.
by ncradioeng
Fri Nov 02, 2018 8:02 am
Forum: AM Radio
Topic: RF Ammeter resistance
Replies: 15
Views: 869

Re: RF Ammeter resistance

I would try different straps - if the connections between the straps and the meter studs are not making a solid connection, then that is where the heat is coming from. That could also explain the drifting.