KPFK Transmitter Tour
Uploaded by: donmussell12
Video Description:
A brief look at the KPFK transmitter facility at Mt. Wilson, 5700 feet above Los Angeles. We just finished adding a new antenna system, so the site is a mess at the moment.
The main transmitter is an Armstrong 60000FMT, and the backup transmitter is an older CCA 20000GS. KPFK operates with 110,000 watts ERP (effective radiated power). The new antenna is a Shively 6814-5R.9SS, a high power, reduced wave-spaced design, which allows more power to the audience and less e
nergy on the ground below the tower. The standby antenna is a Jampro 4 bay high power model, and at the very top of the tower is a single bay Shively 6814 backup. The big reddish covers are for ice protection, which is very important up at Mt. Wilson. The winter of 2008 brought lots of ice and snow,
and lots of damage to adjacent transmitter sites up there. KPFK did fine, except for one of the STL (Studio-transmitter link) dishes that has a bent feed horn (scheduled for replacement this spring). The guy you can see evading the camera is Bob Conger, the chief engineer at KPFK. He keeps the who
le thing running smoothly.
Tags for this video: Angeles electronics KPFK Los mechanics radio transmitter
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| Comments for this video on YouTube |
| superb ( 4 months ago by zvartoshu) |
| superb |
| nice equipment! ( 4 months ago by goakajbr) |
| nice equipment! |
| Very nice video! ... ( 1 month ago by iw3fzq) |
| Very nice video! Why in the USA, usually, you use a big power TX and low gain antennas? Here in Italy, for medium range, we use 15/20 KW but high gain antennas: 16 or 24 or 32 yagi array instead of 6 or 8 as I seen on USA repeater. Enrico. |
| When I was training ... ( 1 month ago by anorak64) |
| When I was training with BBC Transmitters, at the main high power sites such as Sutton Coldfield, Birmingham UK, there were two 20-kw parallel output amplifier units on the ground (one pair for each of BBC Radios 2,3 and 4 as was the case in 1987), feeding into two stacked sets of high gain umbrella dipoles and giving effective radiated power (ERP) of 240 kilowatts. High gain antenna syatem +relatively low final amplifier power = higher efficiency and greater ERP |
| Because of the ... ( 1 month ago by donmussell12) |
| Because of the location of Mt. Wilson, 5,700 feet above Los Angeles, a high gain antenna is not effective at reaching the service area, which is well below the mountain. A low gain, wide aperture antenna is required to send the signal down enough to reach the audience. Hence, the four bay antenna and high transmitter power. |
| There are three ... ( 1 month ago by donmussell12) |
| There are three parts to the air system. We have a big filtered blower that sends filtered air into the building at 8,000 CFM. The exhaust hood has a blower that pulls air from the building at 6,000 CFM. And an internal air conditioner that cools the building in summer. Because the site is nearly 6,000 feet above sea level, it mostly stays cool, and only gets warm outside about 40 to 60 days a year. The rest of the time, fresh (filtered) air keeps things nice inside. |
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