Search found 936 matches

by Dale H. Cook
Fri Jan 22, 2021 9:04 am
Forum: AM Radio
Topic: Nautel AMFET ND5 blowing output network caps
Replies: 18
Views: 1500

Re: Nautel AMFET ND5 blowing output network caps

The second time this happen I checked the caps in the combiner. Values were within tolerance Did you check them at working voltage? At times a cap may measure well with, say, the 9VDC of an LCR meter, but tell a different story at working voltage. Did you a) pull them all out to look at their back ...
by Dale H. Cook
Sun Jan 10, 2021 10:11 am
Forum: AM Radio
Topic: Gates MO-3759 Diode Rectifier - "DCC. Wire"
Replies: 7
Views: 143

Re: Gates MO-3759 Diode Rectifier - "DCC. Wire"

RGORJANCE wrote: Sun Jan 10, 2021 8:48 amAnyone remember winding a coil on an Oatmeal carton to make a crystal radio?
Yup, did that as a kid.
RGORJANCE wrote: Sun Jan 10, 2021 8:48 amOr a Captain Midnight decoder ring?
Nope, I'm too young for that one - the radio serial went off the air two years before I was born.
by Dale H. Cook
Sat Jan 09, 2021 7:40 pm
Forum: AM Radio
Topic: Gates MO-3759 Diode Rectifier - "DCC. Wire"
Replies: 7
Views: 143

Re: Gates MO-3759 Diode Rectifier - "DCC. Wire"

Sounds like it could be "LITZ WIRE" Pete - Thanks for the response, but it is definitely not Litz wire. I have worked with Litz wire for decades, and still own a (seldom used) spool of 7/41 Litz wire (7 individually insulated strands of #41 wire braided together). Litz wire is multi-stran...
by Dale H. Cook
Sat Jan 09, 2021 5:55 pm
Forum: AM Radio
Topic: Gates MO-3759 Diode Rectifier - "DCC. Wire"
Replies: 7
Views: 143

Gates MO-3759 Diode Rectifier - "DCC. Wire"

I am working on a vintage (ca. 1951-1959) Gates MO-3759 Diode Rectifier, which provides a remote base current metering voltage. The secondary of the RF input transformer is described on the schematic as "300 TURNS #32 DCC. WIRE" (including the period after "DCC"). Does anyone kno...
by Dale H. Cook
Wed Dec 30, 2020 11:45 am
Forum: AM Radio
Topic: Nautel AMFET ND5 blowing output network caps
Replies: 18
Views: 1500

Re: Nautel AMFET ND5 blowing output network caps

I have been in contact with Nautel and checked everything they have indicated. But have you talked to Steve Braley during business hours? The younger techs at Nautel are working from printed or electronic troubleshooting information and not from personal experience. Steve has extensive hands-on exp...
by Dale H. Cook
Wed Dec 30, 2020 10:10 am
Forum: AM Radio
Topic: Nautel AMFET ND5 blowing output network caps
Replies: 18
Views: 1500

Re: Nautel AMFET ND5 blowing output network caps

Have you looked at the load with an OIB? As Deep suggested upstream there may be a problem with the PWM not muting with a bad load, so I would also look closely at the detection/muting circuit. You should talk to Steve Braley at Nautel. He is the only remaining tech with significant hands-on experie...
by Dale H. Cook
Wed Dec 30, 2020 9:59 am
Forum: AM Radio
Topic: Nautel AMFET ND5 blowing output network caps
Replies: 18
Views: 1500

Re: Nautel AMFET ND5 blowing output network caps

Not at all familiar with Nautel AM's, but is it normal for the coils in the output network to run hot enough to burn those coil forms? I was going to remark on that inductor but you beat me to it. I have been working with Nautel AM transmitters (including an ND5 and two ND1s) for nearly 20 years, a...
by Dale H. Cook
Fri Dec 18, 2020 6:15 am
Forum: AM Radio
Topic: Lost Tower Site: Long-wire antenna OK till new site found?
Replies: 3
Views: 240

Re: Lost Tower Site: Long-wire antenna OK till new site found?

1 - I've heard that AM stations who loose their tower site may temporarily operate on a long-wire antenna... true? True, but as with any other long-term operation at variance with the license you will need an STA. 2 - What length long-wire & what grounding would normally be used? Whatever lengt...
by Dale H. Cook
Thu Dec 17, 2020 4:13 pm
Forum: Everything else
Topic: Bought a New LCR Meter
Replies: 7
Views: 669

Re: Bought a New LCR Meter

Which kelvin clips did you purchase? a link would be great too. I don't see them on Amazon at the moment. They were similar to these but they were gray - I tagged them with red and black heat shrink on the handles. Any recomendations for a (affordable) semiconductor tester that could be used to mat...
by Dale H. Cook
Fri Dec 11, 2020 5:37 am
Forum: Production Studios
Topic: Small and robust sound card. Recommendation?
Replies: 8
Views: 2832

Re: Small and robust sound card. Recommendation?

DaveSt wrote: Thu Dec 10, 2020 3:12 pmYes, I have used the Z400's too.
And I have worked with about a dozen Digigram sound cards over the years, including a few flavors of the VX222. Digigram has long been my choice in professional sound cards (I even bought one for my work as a contract CE).
by Dale H. Cook
Thu Nov 05, 2020 8:40 am
Forum: Everything else
Topic: Bought a New LCR Meter
Replies: 7
Views: 669

Re: Bought a New LCR Meter

kcbooboo wrote: Thu Nov 05, 2020 7:09 am... they seem to think that just because there are four wires, that makes it a Kelvin test lead.
Yup, that is one reason why I rolled my own.
by Dale H. Cook
Thu Nov 05, 2020 8:38 am
Forum: Everything else
Topic: Bought a New LCR Meter
Replies: 7
Views: 669

Re: Bought a New LCR Meter

What does it take to get the longer test leads on it (and remain reasonably accurate)? I bought an extra TL-21 test lead set (the same set with short 4-wire leads and alligator clips that I got with the module). I also bought a pair of inexpensive Kelvin clips. I used four 2' lengths of RG-174 to c...
by Dale H. Cook
Wed Nov 04, 2020 11:40 am
Forum: Everything else
Topic: Bought a New LCR Meter
Replies: 7
Views: 669

Bought a New LCR Meter

For about 25 years I have used an inexpensive LCR meter for quick checks in the field. It was an Elenco LCR-1801 that had a guard terminal (used with shielded leads to reject noise and RF) but only measured to 200 uf. In recent years it has developed problems including a failure of one of the flat s...
by Dale H. Cook
Sun Aug 30, 2020 8:06 am
Forum: Radio Studio Engineering
Topic: Simple audio swithcer for two sources
Replies: 4
Views: 834

Re: Simple audio swithcer for two sources

I was about to make a suggestion but Kevin beat me to the gist of it. I have done this with a BT switcher and an old computer with a serial port or a serial to USB converter. That is likely your cheapest option as any hardware with a built-in GUI would probably not be inexpensive.
by Dale H. Cook
Tue Aug 25, 2020 4:09 am
Forum: On-Air Studios
Topic: Out of Control Audio
Replies: 9
Views: 519

Re: Out of Control Audio

My question to you guys is, would you simply suggest they begin normalizing all new songs and try to work their way back through the existing library? Yes, but you and the staff need to note which songs are way too hot and make those a priority for normalization. ... is there a better technique to ...