January 2012
M T W T F S S
« Dec   Feb »
 1
2345678
9101112131415
16171819202122
23242526272829
3031  

Archives

Categories

WRKI WINE transmitter move, update 2

Man, this is taking longer than I though it would. We moved the Harris FM25K last week, all went well. The only hangup, as you can see, is the harmonic filter and the height of the racks next to the transmitter. The transmitter had to go on a 4×4 to get the filter up over the racks. The output from the transmitter to the harmonic filter cannot be changed in any way, shape or form (e.g. adding a little bit of line section to the top of the transmitter), else the transmitter will not run. So, up on 4×4’s it is.

WRKI WINE transmitter room

WRKI WINE transmitter room

There we were, all ready to turn the transmitter on.  Press the high voltage on button, lots of volts but no current and no power output.  Seems something is wrong with the outboard IPA driver (over in the bottom of the rack, that thing pulled out with the manual on it).

The IPA is a Silicon Valley Power Amplifier 500 watt unit, which replaced the internal IPA driver about ten years ago.  The tube in the Harris FM25K needs at least 390 watts to drive the transmitter to full power.  Unfortunately, this particular amplifier was not in the best environments prior to the recent move.  It was sitting in an unconditioned building on top of the backup transmitter in high heat and humidity.  According to the manufacture, such abuse is bound to take it’s toll sooner or later. The later being, of course, the night we want to turn the thing back on and go home.

Time to drop back and punt.  I found an old RVR 250 watt amp at a sister station nearby, which was also in pretty bad shape but repairable.  That unit was pressed into service temporarily and with 200 watts drive, the old 25K put out about 11 KW.  We need to affect permanent repairs to the RVR power amp before we place into temporary service.  I don’t want any 2 am phone calls.  The Silicon Valley Power Amp needs to have the amplifier module sent back to the manufacturer and rebuilt.  They will refurbish the entire thing for something like $900.00 plus shipping.  Considering what it does, that is worth it.

This is a little short cellphone video of the turn on at half power.  This is a very loud transmitter, as such, I think the audio is a little distorted.

When this beast gets up to full power, I will update this, again.

Axiom


A pessimist sees the glass as half empty. An optimist sees the glass as half full. The engineer sees the glass as twice the size it needs to be.

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
~1st amendment to the United States Constitution

Any society that would give up a little liberty to gain a little security will deserve neither and lose both.
~Benjamin Franklin

The individual has always had to struggle to keep from being overwhelmed by the tribe. To be your own man is hard business. If you try it, you will be lonely often, and sometimes frightened. But no price is too high to pay for the privilege of owning yourself.
~Rudyard Kipling

Everyone has the right to freedom of opinion and expression; this right includes the freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers
~Universal Declaration Of Human Rights, Article 19

...radio was discovered, and not invented, and that these frequencies and principles were always in existence long before man was aware of them. Therefore, no one owns them. They are there as free as sunlight, which is a higher frequency form of the same energy.
~Alan Weiner

Free counters!