Millennium Receiver & Ultrascan Antenna
If you use 2 GHz ENG and experience loss of range or video "glitches" in severe cases, give us a call at 1-954-850-1016. This applies to all Brands.
The latest Ultrascan antenna does a decent job of reducing PCS on Block "A" and the lower part of "B", but not Block "C". New problems are also surfacing. The new Ultrascan antenna at WOFL-TV, Orlando Florida, was desensitizing Gordon Smith's (phone: 407-741-5132) new ENG system by dumping high level UHF TV signals into their new Millennium receiver, from TV transmitters a mile or so away. These channels fall near the 1st IF receive frequency, and prevent weak signal reception.
The same problem was experienced by Richard Danysh (phone: 210-366-1129), at KABB-TV, Houston Texas, with the previous model Ultrascan. He experienced a severe loss of range, and was limited to about a 10-12 mile ENG range. We provided an add-on RF Suppression Kit, and he reported a 35 mile ENG shot, using low power (2 watts). We now have a kit to retrofit Ultra-Scan Antenna Systems.
On Wednesday, May 13, 1998, Chief Engineer Ken Preston, WOFL-TV, Orlando, Florida, reported a news shot being blown away by another local station's news van. I was surprised to find that WOFL-TV was using 2.5 Ghz channel 9 (2475.5 Mhz), and the other station was operating on 2 Ghz ENG channel 6 (2084.5 Mhz)! These channels are almost 400 Mhz from each other, and this is Microwave Radio's latest equipment!.
The '98 model Ultrascan, like the previous model,
allows high power signals into the system. We know how they're
getting in, but we're not telling!!! Give us a call, and we'll do a mod for you!
This is the actual signal from WOFL-TV's new Ultrascan ENG antenna.
The interfering signal you are seeing here is UHF TV channel 65.
The signal level is -15.7 dbm, and is blasting through
the receiver's LNA and mixer, right into the
1st IF amplifier, at 744 MHz! Even the
LNA's noise floor is high, after going
through 1120' of 7/8" Heliax line.
Here are some other carriers. ENG channel 5 is at -24.5 dbm. There is
1120 feet of 7/8" Heliax on WOFL's tower, so the signal at the output
of the LNA, based on 2.2 db loss/100,' is ~0 dbm. Please keep in mind
that the signal from UHF channel 65 and other carriers, are all mixing together.
If you were to take 20 separate 1-milliwatt signals, and amplify them all 10 times,
you would need an amplifier that could cleanly handle 200 MILLIWATTS! We
feel it is better to filter out unwanted signals, than to build high power amps,
and dump all this junk into the front end of your receiver!
In addition, the new Ultrascan passes unwanted signals
above the 2 GHz band.
To prevent this from happening to you, or to restore maximum range to your ENG or STL system, give us a call. We have mods for ALL Antenna Systems and Receivers.
Give us a call at 1-954-850-1016