Sometimes they give the petitioner enough rope to hang themselves.Nathaniel Steele wrote: ↑Fri Feb 19, 2021 4:02 pm They've already approved the experimental license for some testing haven't they?
Search found 3538 matches
- 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
- 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 ...
- 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...
- 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...
- 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.
- 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...
- 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...
- 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 ...
- 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 ...
- 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...
- 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...
- 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 ...
- Wed Sep 02, 2020 3:42 pm
- Forum: FM Radio
- Topic: Harris THE-1 FM Exciter Transformer
- Replies: 4
- Views: 441
- 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...
- 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.