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Winter! Is upon us….

What better time to take the gondola to K-1? None, none at all.  We do work for the two radio stations that are on the peak of Mount Killington, near Rutland, Vermont.  In the summer, usually we can drive up there in a four wheel drive truck.  In the winter, the gondola is the way to go.  On this day, there was a 48-56 inch base, light north winds and air temperature around 10° F (-12° C) .

This is not my video, I did not have enough memory on my SIM card to film a video and I didn’t bring my expensive camera. However, this is a good example of the ride:

Not a bad way to get to a transmitter site, all things considered.

Ride up to Killington Peak

Ride up to Killington Peak

View from Killington Peak

View from Killington Peak

View from Killington Peak

Transmitter buildings on Killington Peak

View from Killington Peak

View from Killington Peak

View from Killington Peak

Tower from Killington Peak

Killington STL dishes

Killington STL dishes

ERI antenna, WZRT/WJJR Killington VT

ERI antenna, WZRT/WJJR Killington VT

The reason for the trip today; repair work on the Nautel VS2.5 transmitter. All three power supplies and the power supply summing board needed to be replaced.

MPX over IP

In the progression from Circuit Switched Data to Packet Switched Data, I can think of many different applications for something like this:

FMC01 MPX to IP CODEC

FMC01 MPX to IP CODEC

The FMC01 MPX to IP encoder can be used for multi-point distribution (multi frequency or same frequency network) of FM Composite audio, or as a backup solution over a LAN bridge, LAN extension, or public network.  I can think of several advantages of using this for a backup when composite analog STL’s are in use.  There are many compelling reasons to extend the LAN to the transmitter site these days; Transmitter control and monitoring, security cameras, office phone system extensions, internet access, backup audio, etc.  I would think, any type of critical infrastructure (e.g. STL) over a wireless IP LAN extension should be over a licensed system.  In the United States, the 3.6 GHz WLAN (802.11y) requires coordination and licensing, however, the way the rules are set up, the license process is greatly simplified over FCC Part 74 or 101 applications.

Another similar CODEC is the Sigmacom Broadcast EtherMPX.

Sigmacom Broadcast EtherMPX CODEC

Sigmacom Broadcast EtherMPX CODEC

Features include:
• Transparent Analog or Digital MPX (MPX over AES), or two discrete L/R channels (analog or AES).
• Built-in MPX SFN support with PTP sync (up to 6.000km in basic version). No GPS receivers!
• Unicast or Multicast operation to feed unlimited number of FM transmitters with MPX from one encoder.
• Linear uncompressed PCM 24-bit audio.
• Very low audio latency: 2,5mS in MPX mode.
• Perfect match with Sigmacom DDS-30 Exciter with Digital MPX input.
• Can be used with high quality 802.11a/n Ethernet links.
• DC coupled, balanced Analog inputs & outputs with -130dBc noise floor.
• No modulation overshoots due compression or AC capacitor coupling.
• Decoder provides simultaneously Analog & Digital output for transmitter redundancy.
• Aux RS232 serial transparent link, Studio to Transmitter.
• Auto switchover to Analog input when Digital signal is lost.
• Centralized remote control & management software

One last thought; separating the CODEC from the radio seems to be a good idea. It allows for greater flexibility and redundancy. Using an MPX type STL allows sensitive air chain processing equipment to be installed at the studio instead of the transmitter site.

Well, crap

Radio Shack Store, Courtesy of Wikipedia

Radio Shack Store, Courtesy of Wikipedia

Radio Shack (AKA, RadioShack, The Shack, Tandy Corporation, Realistic, Optimus, etc) appears to be filing for Bankruptcy if the Wall Street Journal and Reuters is to be believed.  I see the words “private equity firm” in the article, that does not bode well.

Radio Shack of late has become a glorified cell phone store.  It used to be one could get some emergency repair parts, an FM antenna or a CB radio as the need arose.  As a young lad, it was fun to poke around and look at the various radio kits and other assorted fun things.  My first shortwave radio was a kit from Radio Shack; assembly finished just in time to hear the Vatican Radio’s announcement that Pope Paul IV had died.

What happened to Radio Shack is fairly typical; what was once a niche market for hobbyists and experimenters tried to go main stream and lost their core customers.  There are still plenty of electronics hobbyists out there, look at the Amateur Radio community as an example.  Yet, that market was abandoned for the more lucrative general consumer electronics market.  Unfortunately, Radio Shack never produced high quality stuff, so their reputation in the consumer electronics market was not that great.  Thus, not being known for anything, they slowly slipped into irrelevance.

Don’t try this at home, kids

Happy New Year, and stuff.

I found this interesting little video on Youtube recently:

That has to be a fairly high powered AM radio station to have that effect. According to the video, this is in Ukraine.

Other than generating RF burns to the hands, there is also the issue of exposure to non-ionizing radiation causing body tissue heating. Then there is the potential broadband RF interference from the arcing plant matter. This can cause interference to STL’s and other receivers.

Friday Funnies; malaise edition

Remember when there was actual competition between radio stations for the coveted #1 bragging rights?  That was way back in the day when talented air persons were sought and compensated for their performances.

These days, when thinking about certain owners and their money men, a certain Fat Boy Slim album cover comes to mind:

cd-fat-boy-slim-youve-come-as-long-way-baby-chemical-brother_MLB-F-3935679143_032013

Ahhh, the 90’s, I never thought I’d miss you.

Village seeks repayment from Energy Onix

This saddens me a little bit.  Apparently, the Village of Valatie, NY is seeking repayment of a $500K loan from Transmitter Manufacturer Energy Onix.  Since the passing of Bernie Wise, the company has basically folded.

The village may foreclose on the building if necessary, said Mayor Diane Argyle.

Located at 1306 River St., Energy-Onix was founded in 1987 by broadcast pioneer Bernard Wise, who is known for bringing the “grounded grid” to radio broadcasting. The company designed, manufactured and sold radio transmitters and tubes.

More from the Columbia-Greene Register Star.

Sadly, there goes support for many Energy Onix and CCA transmitter still in the field.  I know of several of those old CCA transmitters that are still cranking away, 40 or more years after they rolled out of the factory in Gloucester, NJ.   I have tried, several times, to call Energy Onix since Bernie passed last year and the phone goes unanswered.  I wonder if we could pick up the the field support and service for these units.  I wonder if there are any spare parts left at the old factory building?

 

 

Longest tube life?

We may be going for a record here; this Broadcast Electronics FM20T was placed in service on June 6, 2001:

Broadcast Electronics FM20T, WYJB, Albany, New York

Broadcast Electronics FM20T, WYJB, Albany, New York

The original 4CX15000A tube is still in use.  I wrote about this a few years ago in this post: Longevity.

I thought by now, we would have changed out that tube.  A few quick calculations shows that the tube has been in use for 118,289 hours or 4,929 days or 13 years 6 months and 3 days.  Anyway you look at it, that is a long time for one tube in nearly continuous use.  I noticed the hour meter is lagging a bit:

Broadcast Electronics FM20T hour meter, WYJB, Albany, New York

Broadcast Electronics FM20T hour meter, WYJB, Albany, New York

Reads 113051.24, which is 5,238 hours different than what I calculated from the maintenance log.  I noticed a slight discrepancy in hours two years ago and attributed it to various off air periods.  However, between then and now, this transmitter has not been off at all.  Thus, the hour meter is wearing out before the tube.  I would say that this is because of excellent filament voltage management,  but I think we simply have a really good tube.

Has anyone else had a tube that lasted this long or longer?

Transmitter Haiku

I wrote a little Haiku about Thanksgiving dinner:

Telephone rings
Old transmitter beckons
Dishes get cold

Not exactly the 5/7/5 of a traditional haiku, but close enough.  This year, it was the nearly 30 year old Broadcast Electronics FM35A at WEBE.   A set of readings from the remote control reveal; zero forward power, zero plate current and 12.8 KV plate voltage.  My first assumption was some sort of drive issue; a failed exciter or IPA driver.  After starting the backup transmitter and making sure that it was running stably, I spoke with the program director and told him we would be out next morning.

Upon arriving at the transmitter site, I found the BE transmitter had no filament voltage.  An obvious clue, I began working backwards from the tube socket until I found this:

Broadcast Electronics FM35A filament voltage regulating transformer

Broadcast Electronics FM35A filament voltage regulating transformer

This is the auto-transformer that regulates the filament voltage.  Schematically, it is noted as T204 and it is in series with one side of the filament transformer.  This one is burned open.  The bad news;  Broadcast Electronics does not stock this part, it is a special order item, the replacement part costs $2,800 dollars and it will take a few weeks to get here.  The good news, after digging through our stock of old transmitter parts, I found an exact replacement:

Replacement part, T204, BE FM35A

Replacement part, T204, BE FM35A

Replacement part name plate, T204, BE FM35A

Replacement part name plate, T204, BE FM35A

We will be installing it on Monday morning.

Zmog!

The quick disconnect LNB:

C-Band LNB

C-Band LNB

Umm…

No food or drink in the studio

This is a rule that I always find difficult to enforce.  Since switching into contracting mode, I am often at any particular studio once per week or less.  It seems to me, no matter what signs are posted or what words are spoken, the DJ seems to hear; “It is okay to eat and drink in the studio.”

Of course, with that attitude, the inevitable is bound to happen:

RS-18 Millenium console on/off button membrane

RS-18 Millenium console on/off button membrane

To make things worse, this was spilled on the main mic on/off buttons.  These button membranes come in groups of six and are not inexpensive.  The complaint was “The main mic will not turn off.”  Ah well, I am paid to fix things after all.  The DJ’s are only inconveniencing themselves at this point.