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Radio Broadcast Technical Consulting and Sales
 10032 Island Drive, Brainerd, MN  56401

  Customer

KMHL AM 1400 KHz/1000 Watts, Marshall, MN
KKCK FM 99.7 MHz/100 KW ERP/925 feet HAAT, Marshall, MN
KARZ FM 107,5 MHz/15 KW ERP/430 feet HAAT, Marshal, MN
KARL FM 105.1 MHz/45 KW ERP/502 feet HAAT, Tracy, MN  
KNSG FM 99.4 MHz/50 KW ERP/472 feet HAAT, Springfield, MN
Telephone number at KMHL/KKCK/KARL/KARZ/KNSG Radio is 507-532-2282
Here is Scott Schmeling, Corporate Chief Engineer for the Linder Stations.  He has just removed the PA tube socket from a Harris HT-20 FM Transmitter.  This is no minor task as it takes an hour to do so.  In the background are two Telewave wattmeters used to measure input power, output power, and VSWR on the directional coupler feeding RF from the 700 watt solid state RF driver to the 8990/20,000A power amplifier tube. 
The tube socket was removed for maintenance.  Scott is aided by assistant Keith Petermeyer as they work on the underside of the tube socket.  A Sencore Z-Meter was used to measure the capacitors on the tube socket assembly to confirm everything was as it was supposed to be. 

As it turned out, a finicky IPA to PA adjustment was the result of poor neutralization on the power amplifier tube.  Adjusting neutralization, using a spectrum analyzer, took care of the tuning problem on this incident in August of 2006.

Website for the Linder Stations at Marshall is:  http://www.marshallradio.net

The telephone number at KMHL/KKCK/KARL/KARZ/KNSG Radio is 507-532-2282.

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page last edited 03/22/2008