Here's an update on the OTA signals coming from the KTZZ (!) tower on Capitol Hill. Since we put the new KZJO transmitter on the air with the top mounted antenna and ran it up to make our full licensed power in late February, the new transmitter has tried to commit suicide twice.
Several weeks ago an o-ring failed in the cooling system and the transmitter tried to drown itself in coolant from one of the heat exchange pumps. While it runs much cooler than the previous transmitter, it still generates enough heat to require a liquid cooling system. Power was down for a number of days as we sorted that out and installed new parts (under warranty!) from the manufacturer.
This past weekend, a harmonic filter failed and the transmitter tried to set itself on fire due to the heat generated from dramatically increased resistance in part of the feed line. Fortunately, the transmitter detected the increased reflected power and shut that part of the transmitter off. It took two of us with crowbars to pry the harmonic filter off of the combiner as the heat in the center conductor had started to fuse the filter to the "bullet" at the top of the combiner.
A new harmonic filter has been installed and the power has been run up to 90% of where it should be as a test. On Sunday the 5th it will be brought up that last 10% and we will be back at full rated power. If you were having problems with KZJO over the past month it was because the main transmitter wasn't able to make full power or we were on the auxiliary transmitter while the main was being worked on.
Also last week, a brand new, modern transmitter has replaced the very old, somewhat unreliable and un-supported transmitter for KCPQ-LP (RF 22, 13.x) on the Capitol Hill tower. We did have to reduce power on this license when the repack happened from 15kw to 7.5kw. The new transmitter, of course, is set to make a 7.5kw ERP so there probably won't be improved signal strength for anybody but the frequent outages caused by the old one should be a thing of the past. Another plus is that we now have a spare working transmitter that we can use to keep our other translator stations in the area on the air when their (un-supported) transmitters fail.
I have also personally inspected the KBTC translator on RF 28 and can report that in addition to moving their antenna up the tower in February they have also significantly increased the power; both of these things should lead to a better signal on KBTC (RF 28/28.x) here in the Seattle area.
Finally, I did inspect the sad, forgotten transmitter for K08OU-D, the Three Angels Broadcasting station. I may have mentioned earlier that three of the four power modules in the transmitter appear to have failed and the transmitter appears to be putting out maybe 10 watts. I did send an e-mail to a contact person and heard back, thanking me for the heads up and promising to contact somebody in their technical department. That's about as far as it went as I haven't noticed any signal improvement (not that I want to watch this channel) on this station.
All for now-