M. W. Persons and Associates, Inc.

     Over 30 Years in Business

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


Engineer's Log of Mark W. Persons
Your Intrepid Radio Broadcast Engineer's Log Book

       March 16, 2015:   Update to Continental 802B FM Exciter Power Amplifier Repair
         March 1, 2015:   Radio World Article, Part 2 on Tubes
   February 23, 2015:   Gates Diplomat and Executive Audio Console Modules Worked On
   February 18, 2015:   Good Friend Shane Toven is now with Telos Alliance
     February 6, 2015:   Three-Port FM RF Switch
     February 1, 2015:   Radio World Article on How Tubes Work
      January 8, 2015:   Interviewed on Live Internet Television

   December 22, 2014:  BC-1G  Refurbished Gates BC-1G 1000 Watt AM Transmitter
   December 3, 2014:   "Repair a High Voltage Blocking Capacitor" Article Published in Radio World
     October 27, 2014:   Calibration Controls for Five AM Power Levels
     October 20, 2014:   VSWR Calibrator for FM Broadcast Transmitters
     October 14, 2014:   Jim Lamke from KOZY/KMFY Radio Stopped By
       October 8, 2014:   Article in Radio World Magazine
       October 1, 2014:   RF Low Pass Filter for an FM translator
September 22, 2014:   Main/Auxiliary Antenna Switch for 5 KW
September 19, 2014: ITA  Mystery Solved on What ITA Stands For
     August 13, 2014:  Article about Doing Sports Remotes published in Radio World Magazine
     August 11, 2014:  Moon Over Brainerd
       August 6, 2014:  AM RF Junction Box with Arc Gap
         July 14, 2014:  Clif Groth from Watertown, Wisconsin, Visited Here
        June 23, 2014:  A Trip to the top of the IDS Center in Downtown Minneapolis
           May 7, 2014:  Irritating Sound Article Published In Radio World
           May 7, 2014:  Jordan Zeller Stopped In.
        April 12, 2014:  67th Birthday
          April 7, 2014:  Display Floors Opened
          April 5, 2014:  Speech at a Society of Broadcaster Engineers' Conference
          April 4, 2014:  Speech to the Association of Public Radio Engineers in Las Vegas
        March 9, 2014:  SBE HAMnet Chapter of the Air and Art Bell  revised 03-31-14
  February 15, 2014:  St. Cloud Cabin Fever Reliever Hamfest
    February 1, 2014:  Adjust Rules for NRSC Measurements
    January 23, 2014:  Phasor Box Removes RF Hazard
      January 8, 2014:  Where Have All The Broadcasters Gone? Book for Sale
      January 7, 2014:  Resistor and Switch Modification for Continental 802A & B FM Exciters
      January 6, 2014:  AM Loop Receiving Antennas

 December 31, 2012:  2013  Year End Review
 December 18, 2013: 
Fix a Transmitter Tube Socket Article in Radio World
 December 10, 2013:  Mark's Mother June Passed Away
   November 6, 2013:  Article Published in Radio World
   November 1, 2013:  Bill Satre Stopped By
     October 11, 2013:  More Power Scotty!
       October 9, 2013:  Long Time Client Rod Grams Passed Away
September 28, 2013:  Trouble in a Harris FM 300 Watt IPA Module
September 25, 2013:  Shorted Quarter Wave Stub for FM using 7/8" Rigid Line
September 12, 2013:  Burned MW-1 PA Module Repaired
       August 29, 2013:  A Trip to KLOH Radio
       August 26, 2013:  Randy Wabik visited from WEBC Radio
       August 23, 2013:  Pallet Amplifier for a BE IPA module
         August 9, 2013:  Dinner with Lou Buron and Mary Campbell
         August 6, 2013:  Radio Systems Audio Console Repair Job
         August 1, 2013:  Four AM Stations Sharing One Site Article in Radio World
           July 16, 2013:  Harris Z10 Rectifier Module Repair
           July 13, 2013:  Emergency Power Transformer Replacement for KCLD-FM
          June 23, 2013:  Collins AM RF Switch Repaired and Improved
          June 21, 2013:  SBE Chapter 17 Picnic
            June 9, 2013:  Clear Channel Radio in Minneapolis/St. Paul added to Customer List
            May 22, 2013:  Radio World Article on Shorted Quarter Wave Stubs
            May 20, 2013:  A Visit to Crown Broadcast in Elkhart, Indiana
            May 20, 2013:  A Visit to Fair Radio Sales
            May 18, 2013:  Voice of America
            May 17, 2013:  Hamvention in Dayton, Ohio
            May 16, 2013:  A Tour of Electronic Research in Chandler, Indiana
           May 15, 2013:   Microphone Museum and 88 Nine Radio in Milwaukee, Wisconsin
             May 8, 2013:   Still More FM Exciters in the Shop for Repair
             May 4, 2013:   Hamfest in Superior, Wisconsin
          April 25, 2013:   FM Combiner Configured and Tuned
          April 17, 2013:   DX Listener Reports from Norway and Finland
          April 10, 2013:   Radio World Article on FM Exciter Repairs
            April 1, 2013:   Dihydrous Monoxide Discovered
        March 26, 2013:   New On/Off Swiches for a Continental FM Transmitter
          March 7, 2013:   Two Manual Audio Switchers
    February 14, 2013:   LPB 20 Watt AM Transmitter Repaired and Modified
      January 16, 2013:   "Your Scope Is a Tool for All Seasons" Article Published in Radio World

   December 31, 2012:  2012  Year End Review
   December 29, 2012:  New Telephone Interface for Digital and IP Phones
   December 27, 2012:  New RF Amplifier for Continental 802A FM Exciter
   December 13, 2012:  Andy Bursaw has a New Job
     December 5, 2012:  Del Dayton stopped by
   November 21, 2012:  Avoid Hall of Shame article Published in Radio World
       October 11, 2012:  Mark appeared on Internet Television...Again!
       October 10, 2012:  Installing Connectors article Published in Radio World
    October 9-11, 2012:  Wisconsin Broadcasters' Clinic
        October 2, 2012:  Dan Zimmerman stopped by at M. W. Persons
   September 6, 2012:  Visiting Roger Utnehmer at WBDK Radio
        August 28, 2012:  Three Continental Exciters in the Shop
        August 27, 2012:  Continental 802A&B RF Amplifier Upgrade
        August 20, 2012:  Hum and Buzz in STL Preamplifier
        August 17, 2012:  Silicon Valley 500 Watt RF Amplifier Repair
August 10 & 12, 2012:  Visiting Clients in Southern Minnesota
             July 26, 2012:  Visit to the WHBY AM Transmitter Site
             July 20, 2012:  Building Cooling article Published in Radio World
             July 20, 2012:  Rick Keefer picked up a Rebuilt Transmitter
           July 11, 2012:  Energy-Onix SST-30 FM Exciter Repair
           July 10, 2012:  Conditioning New Old Stock Tubes
           June 21, 2012:  Dinner with Jim Zastrow and an SBE Meeting
           June 20, 2012:  Keep That Transmitter Building Cool article published in Radio World Magazine
           May 30, 2012:  FM Transmitter picked up for Refurbishing
           May 26, 2012:  Harris 150 Watt RF Preamplifier Updated
           May 9, 2012:  Where Have All the Engineers Gone? article published in Radio World Magazine
           May 7, 2012:  Frequency agility made easier on a CCA FM Exciter
           May 5, 2012:  Duluth, Minnesota, Hamfest
           May 3, 2012:  Broadcast Electronics AM5E transmitter cooling system improvement.
           April 28, 2012:  Harris MW-1A PA module repair page updated.
           April 24, 2012:  FM exciter from Hong Kong repaired here.
           April 23, 2012:  Meter replaced in Broadcast Electronics FX-30 FM Exciter.
           April 13-20, 2012:  Mark attended the National Association of Broadcasters annual convention in Las Vegas. 
           April 12, 2012:  Mark celebrated his 65th birthday, but is still a working guy.
           April 1, 2012:  Cycles per Second to Hertz Conversion explained.
           March 16, 2012:  Just unpacked an FM exciter from a station in Florida.  Then four more exciters arrived from a client in California.  That makes five waiting for repair bench time. 
           March 14, 2012:  "Better Living Through Tower Welding"
article published in Radio World Magazine.
           February 25, 2012:  Jim Offerdahl paid a visit bringing equipment for repair
           February 23, 2012:  Broadcast Engineer Marv Olson stopped in to visit
           February 22, 2012:  Dan Houg stopped by to pick up uninterruptible power supplies
           February 16, 2012:  WMIN 1010 AM Sauk Rapids, MN, heard in Finland
           February 8, 2012:  A visit from Steve and Barb Gretsch
           February 1, 2012: "FM Exciter Modifications and Repairs" article published in Radio World Magazine.

           January 23, 2012: New devices for remote broadcast telephones via cellular.  Tech Tips section of Max-ZII page

December 12, 2011: Christmas Letter.
November 1, 2011: Long distance radio reception reports for KVBR and KQDS from a listener in Finland.
October 19, 2011: "Rebuild That Relic of an AM Transmitter" article published in Radio World Magazine.
October 17, 2011: John and Nina Heltemes visit from Faribault, Minnesota.  Details
October 6, 2011:  Doug Thompson, radio broadcast engineer, stopped by to visit.  Details
October 5, 2011: "Hey, What's his at 1300 KHz?" article published in Radio World Magazine.
September 27, 2011: Dan Hatfield of WJRF Radio stopped by to visit.
September 1, 2011: "How Did That Wireless Tower Get There?" article published in Radio World Magazine.

August 3, 2011: Mark is interviewed again at TWIT TV.  Details
August 1, 2011: Change of Business Plan.  Details
July 11, 2011: KEYL Radio gets a new transmitter.  Details
June 25, 2011: 540 WXYG Radio officially goes on the air.  Details
June 19, 2011: Repairs and updates to a Harris MX-15 FM Exciter.  Details
June 15, 2011: "A Mod Solves Transmitter Troubles" article published in Radio World Magazine
June 3, 2011: More custom-built equipment shipping from M. W. Persons.  Details
May 19, 2011: Visit to KLOH Radio in Pipestone, Minnesota.  Details
May 13, 2011: A Water Tower With No Adverse Effect article in Radio World.  Details
May 13, 2011: Visit to KLQP Radio in Madison, Minnesota.  Details
May 7, 2011: Hamfest in Duluth, Minnesota.  Details
May 4, 2011: New 25 KW FM transmitter installed at KBOT Radio.  Details
April 1, 2011: Negative Electricity Discovered.  Details
March 23, 2011: All-Station Audio Take-Over article published in Radio World magazine.  Details
23, 2011: Mark interview on TWiT Television  Details
March 14, 2011: 
Tower vs. Tower article published in Radio World magazine.  Details

March 3, 2011: New studio room at KJOE Radio.  Details
February 9, 2011: Listener reports from Europe of local AM stations KKIN and WBHR
January 26, 2011: Interview on TWiT Television  Details
January 12, 2011: What's in YOUR Toolbox article in Radio World  Details
January 4, 2011: Tower light replacement in winter  Details

December 31, 2010: Year end review  Details
December 1, 2010: Blower motor replacement  Details
December 1, 2010: He's the Man in the Van article in Radio World  Details
October 26-28, 2010: Broadcasters Clinic in Madison, WI.  Details
October 15, 2010: Power generator maintenance article in Radio World.  Details
September 24, 2010: New transmitter at KBUN Radio.  Details
September 21, 2010: High voltage transformer repair.  Details
September 16, 2010: Continuing education class.  Details
September 8, 2010: Tyranny of Power article in Radio World.  Details
August 23, 2010: New transmitter installed at WBHR Radio.  Details
August 21, 2010: Chris Serani stopped by.  Details
August 9, 2010: New transmitter installed at KLTF Radio.  Details
July 16, 2010: Boyd Bremner retired from KKIN Radio.  Details
July 1, 2010: 1900 MHz Interference article written for Radio World Magazine.  Details
May 21, 2010: Midwest Radio in Green Bay, WI.  Details
April 10-15, 2010: NAB Convention.  Details
March 29, 2010: WXYG Radio under construction.  Details
January 25, 2010: CCA FM Transmitter trouble.  Details
January 22, 2010: Allen Bailey visits.  Details
January 22, 2010: Jon and Joan Larson visit.  Details
January 18, 2010: A Nautel AM transmitter to work on.  Details  Updated 2/18/2010
January 8, 2010: Snow in Minnesota.  Details   Updated 1/26/2010

December 22, 2009: Visit from Shane Toven.  Details
December 21, 2009: A Gates BC-1G Transmitter to retune.  Details  Updated 2/18/2010
December 17, 2009: Tour of Hughes Technologies.  Details
November 20, 2009: Pass/reject filter for WJON Radio.  Details
November 19, 2009: Michael Bovey stopped by.  Details
November 10, 2009: Emergency replacement of a power transformer.  Details
October 31, 2009: Stu and Jane Muck came to visit.  Details
October 2, 2009: Jim Zastrow visited.  Details
September 21, 2009: 
Garrett Wollman stopped by.  Details
August 31, 2009: 
Engine noise in GMC van radio.  Details
August 21, 2009: KNSP Radio gets a new transmitter.  Details
July 20, 2009: A Collins 820E-1A Transmitter work on.  Details
July 7, 2009: RF and cows.  Details
June 21, 2009: HD Radio Testing.  Details
June 13, 2009: Vietnam Veterans Honored.  Details
May 21, 2009: RF radiation and SBE meeting.  Details
May 7, 2009: Arbitron equipment installed.  Details  Updated 4/19/2010
April 1, 2009: 
April Fools Stories.  Details
January 29, 2009: KYCK in Crookston, MN,
gets a new main transmitter.  Details
January 20, 2009: Talked to SBE Chapter 17 about spectrum analyzers
.  Details

December 29, 2008: Transmitter retuned and installed at KMSU.  Details
December 19, 2008: KFAI in Minneapolis, MN, goes IBOC.  Details
December 9, 2008: WPPI is now WMIN Radio and on the air.  Details

December 5, 2008: New spectrum analyzer added to test equipment list.  Details
June 7, 2008: Visit with Clif Groth in Madison, WI.  Details
April 29, 2008: Coil Crushed in Detuning Network.  Details
February 8, 2008: Tour of Broadcast Electronics in Quincy, IL.  Details
February 5, 2008: HD Radio Class in Quincy, IL.  Details

September 14, 2007:  FMeXtra tested at WHMH Radio in Sauk Rapids, MN.  Details
September 5, 2007 Detuning another AM re-radiator.  Details
March 9, 2007: FM Antenna repaired at KSUM.  Details
December 14, 2007: 
New Station built at Blackduck, MN.  Details

January 15, 2007:  Relay Box for satellite receivers.  Details

September 7, 2006:  New Tech-Tips section on this website.  Details
August 8, 2006:  Newly revised and expanded Used Equipment section on this website.  Details
April 29, 2006:  Mark spoke before the Minnesota News Network.  Details

February 2006: Paula is interviewed for Her Voice Magazine  Details

June 23, 2005:  A limited quantity of new Zercom Broadcast Products has become available.  Details
January 6, 2005:  New 1 KW AM RF Switch.  Details
January 4, 2005:  Mark gave a speech to the Lakes Country Computer ClubDetails

November 29, 2004:  Now in stock, a large selection of new and used oil-filled capacitors, dummy loads, and RF switches.  Details
February 24, 2004:  New Deluxe EAS Multi-Station Relay Panel.  Details

November 17,
   Wind generator tower detuning project at KLOH Radio in Pipestone, MN.  Details
September 12, 2003:  Mohawk Military Reunion  Details 
January 10, 2003:   Water tower detuning project at KBUN Radio in Bemidji, MN.  Details

November 30, 2002: Rhythm of the Rails "Old Tyme Radio Hour."  Details
September 11, 2002: AM Expanded Band article in Radio World Magazine written by Mark Persons  Details
May 8, 2002: FM antenna article in Radio World Magazine written by Mark Persons  Details

November 2001: Beta testing of Windows XP.  Details
October 2001: Radio World article by Mark Persons.  Details
June 13, 2001: A tornado takes down tower at Brainerd and knocks out power to the city for 25 1/2 hours.  Details
May, 2001, Mark Persons became a Certified Broadcast Networking Technologist with the Society of Broadcast Engineers.  He is qualified and certified to plan, build, modify, and maintain computer networking systems.
March 12, 2001:
New Minnesota Contractor licensing.  Details
February 2001:   Radio Systems now available from M. W. Persons and Associates Details

August 2000: KQWB-AM Changes frequency.  Details

A bit of ancient Radio history

The stories go on and on.  Stop in again sometime.  I'll leave the soldering iron on for you. 
Mark W. Persons


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page last edited 03/26/2015