Search found 3538 matches

by Deep Thought
Sat Feb 20, 2021 11:11 pm
Forum: FCC Discussion
Topic: Geotargetting boosters "zonecasting" Geobroadcast solutions
Replies: 10
Views: 339

Re: Geotargetting boosters "zonecasting" Geobroadcast solutions

Nathaniel Steele wrote: Fri Feb 19, 2021 4:02 pm They've already approved the experimental license for some testing haven't they?
Sometimes they give the petitioner enough rope to hang themselves.
by Deep Thought
Sat Feb 20, 2021 11:02 pm
Forum: AM Radio
Topic: How deep can AM tower ground radials be buried?
Replies: 5
Views: 223

Re: How deep can AM tower ground radials be buried?

Try to avoid going down more than 12". A local station thought it would be a good idea to fill and level their four tower directional antenna site to make it easier to maintain. Some of the existing radials ended up being three feet down. It seriously hosed the efficiency of the antenna. Don't ...
by Deep Thought
Sat Feb 20, 2021 10:55 pm
Forum: AM Radio
Topic: Parking Vehicles, etc around AM tower?
Replies: 7
Views: 307

Re: Parking Vehicles, etc around AM tower?

Depends on the tower. If it is in the "danger zone" of 135°-170° it'll have a very high base impedance and will be very fussy about things near it so make sure you do it right. A 100x100 foot ground screen around the base will help stabilize it. Many towers have their ground radials embedd...
by Deep Thought
Fri Feb 12, 2021 11:05 pm
Forum: Ask the Engineers
Topic: Shortwave transmitter theory
Replies: 1
Views: 113

Re: Shortwave transmitter theory

DCC (also called modulation-dependent carrier level, MDCL) varies the (what would be the unmodulated) carrier level depending on the instantaneous modulation level in order to save energy. It happens slow enough for the receiver AGC to track. Most of them used here in the US on MW stations reduce th...
by Deep Thought
Fri Feb 12, 2021 11:00 pm
Forum: Radio Studio Engineering
Topic: metadata for automation or music software
Replies: 12
Views: 307

Re: metadata for automation or music software

Research "RDS" or "RDBS" for FM stations. The same systems which are employed for that should work for just about any other similar need. The automation system provides the data, which rides along with the digital audio link to the remote site on a low-bandwidth link.
by Deep Thought
Fri Feb 12, 2021 10:55 pm
Forum: FCC Discussion
Topic: Geotargetting boosters "zonecasting" Geobroadcast solutions
Replies: 10
Views: 339

Re: Geotargetting boosters "zonecasting" Geobroadcast solutions

This is a licensing (as in royalty) play by IP pirates who somehow managed to trademark the term "single frequency network" as it applies to broadcast and also filed for a patent on "geo targeting" as it applies to broadcast. Neither are enforceable and they're trying to milk the...
by Deep Thought
Sun Dec 20, 2020 12:44 pm
Forum: AM Radio
Topic: Lost Tower Site: Long-wire antenna OK till new site found?
Replies: 3
Views: 291

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

The FCC will not allow a permanently constructed new antenna to be used for an STA if a site change is involved. You say the station lost its site...which means this policy kicks in. What "permanently" means is open to interpretation. Depending on the frequency you might be able to get awa...
by Deep Thought
Wed Nov 25, 2020 10:10 pm
Forum: Ask the Engineers
Topic: Does licensed or limited access wifi exist?
Replies: 7
Views: 348

Re: Does licensed or limited access wifi exist?

Since you mentioned "guaranteed reliable wireless Internet" I am assuming that this is not a point-to-point path situation. One solution might be MaxxKonnect Wireless. I have not used them myself but this is run by a broadcast engineering company and is essentially prioritized LTE running ...
by Deep Thought
Fri Oct 09, 2020 12:54 pm
Forum: FM Radio
Topic: Installation tool for AVA-7 Heliax?
Replies: 10
Views: 528

Re: Installation tool for AVA-7 Heliax?

Think about getting the Andrews connectors... Andrew has been out of business for a few years, and I see no source of supply for the connectors. I have the current-production connectors, and just need to install them. Thanks! You won't find any NOS EIA 1-5/8" Andrew connectors either. I had a ...
by Deep Thought
Mon Oct 05, 2020 9:39 pm
Forum: Everything else
Topic: FIELD INTENSITY METER CALIBRATION
Replies: 10
Views: 694

Re: FIELD INTENSITY METER CALIBRATION

I built a calibration rig with induction loops to calibrate these and the FIM21/41 meters, calibrated with a FIM-41 PI had just charged me $1560 to "repair" so it had a paper trail to NIST. It worked very nicely and I was going to offer secondary calibration services (basically checking th...
by Deep Thought
Wed Sep 16, 2020 8:32 pm
Forum: FM Radio
Topic: Quality translator
Replies: 22
Views: 923

Re: Quality translator

The VS300 does seem to be overly sensitive (in my opinion) to the slightest reflected power. One station had a 3-cavity bandpass filter on its output and that forced the VS300 to cut back power drastically. That is the fault of the bandpass filter. I installed a four translator combined site in Feb...
by Deep Thought
Tue Sep 15, 2020 7:18 pm
Forum: FM Radio
Topic: Quality translator
Replies: 22
Views: 923

Re: Quality translator

Another vote for the VS300. Pretty much an all in one transmitter package (audio, remote control, email alarms, etc.) and they are tough little things. Not quite as tolerant of criminal neglect as the old Crowns, which have been documented still running as the building burned down around it or with ...
by Deep Thought
Wed Sep 02, 2020 3:42 pm
Forum: FM Radio
Topic: Harris THE-1 FM Exciter Transformer
Replies: 4
Views: 441

Re: Harris THE-1 FM Exciter Transformer

alleo wrote: Wed Sep 02, 2020 1:59 pmMark Person would have a repair manual for it.
FYI, Mark retired and shut down his business.
by Deep Thought
Tue Aug 25, 2020 10:45 am
Forum: AM Radio
Topic: Nautel AMFET ND5 blowing output network caps
Replies: 18
Views: 1843

Re: Nautel AMFET ND5 blowing output network caps

My experience with that transmitter having output network issues is almost always a load or lightning problem. Normally the VSWR circuit will shut the PWM drive off instantly if the load goes sideways but if that is no longer working correctly it'll keep pumping away until you blow the FETs in a pow...
by Deep Thought
Fri Aug 21, 2020 11:37 am
Forum: AM Radio
Topic: Old radio station (back)
Replies: 3
Views: 273

Re: Old radio station (back)

I hope that this isn't a translator tied to WCHK that is running without the AM on.