Look at the Scala HDCA-5CP/RM, which is a 5 element circularly-polarized yagi. There are two smaller models as well, all rated for 250 watts. Those Yagis have a lot off the backside. You can combine a V and H pol log periodic using a power divider. Scala routinely does these. It'll take up twice th...

kkiddkkidd wrote: ↑

Tue Nov 20, 2018 6:24 pm

ChuckG wrote: ↑

Mon Nov 19, 2018 10:57 pm

When you ask how they monitor the tower lights and they show you the swing in the phase monitor corresponding to the beacons......

Now that's funny right there...

Funny and far too common.

Sounds like the tower I "discovered" was 120 VAC above ground when I connected my OIB-3. I think I scared the cows that night. :shock: I don't recall ever finding a tower with hard 120v on it but have found several that had enough leakage to light you up if the static drain was disconnected. After ...

Sounds like the tower I "discovered" was 120 VAC above ground when I connected my OIB-3. I think I scared the cows that night.

I've done it with current transformers and a comparator circuit set to trigger on an alarm condition based on overall current draw. I used a LM3914 which gave me multiple "taps" to show the beacon and sidelights, and as a bonus showed the beacon flash as well. The remote display had two LEDs per tow...

NECRAT wrote: ↑

Tue Nov 13, 2018 8:56 am

Instead of speculating, we could also just wait for the report to come out as to the cause.

Meh...what fun is that?

Here you go. I ran it twice, once with a base impedance close to what the measured data shows and once with the theoretical base impedance. You can match either with the same components. The current ratings need to be multiplied by 1.6 and the voltage ratings need to be multiplied by 6.0 to account ...

What is the transmission line length? I can take that into account when adjusting the network for best bandwidth at the transmitter end.

Looked to me like a radome fire...the top few seem intact. However they don't just go up on their own so something lower got damn hot.

I'll accept either a whine or a beg. No need to go overboard.

If you give me a description of the tower and what is on it, I can model it and get pretty close to the right phase shift for optimum bandwidth without having to do a full sweep.

DO NOT--repeat--DO NOT try to do this with a "single coil" network. It will be unstable as hell, almost impossible to tune due to the stray reactances and cross coupling between the turns on the coil, and will have shit for bandwidth. I will be happy to send you a proper design for free just to save...

grich wrote: ↑

Sat Nov 03, 2018 9:56 pm

We've already replaced equipment that operated above channel 36, right?

I'm sure T-Mo won't mind sharing...

The perimeter is the outermost property line. As a practical matter, unless you are going to deploy multiple transmitters the limit will be imposed at the point on that perimeter closest to the antenna.

Otherwise, the basics apply to this rig... keep it clean, keep it cool, visit it once in a while. They also really *really* don't like open delta power feeds. One client was replacing fuses and FETs on a monthly basis until they installed a delta-to-wye transformer and haven't had a major problem s...

The FCC only tracks stations running in a digital mode (assuming you're talking about FM) and not how many or what is on the subchannels.

Digital TV is licensed as such, but the FCC does not track the 'dot' channels deployment.