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If you have a question, email us:  teki@mwpersons.com  Put "Broadcast" in the subject line. 


many Equipment manuals, see  Manuals
FM Transmitter Parts and Equipment
. Capacitors, see Capacitors
... Equipment manuals, see  Manuals
  Panel Meters and Watt meters, see Meters

FM RF Amplifiers

1 Harris 992-6842-004 Pre-Amp Module with regulator circuit board.  Has Silicon Valley 510207 RF amplifier that runs at up to 80 watts output, which is what the Harris transmitter design calls for.  Used and in very good working condition.  $450.00 each.  Photo  The module can be reworked here to run up to 150 watts output with a new Broadcast Concepts pallet amplifier.  The unit is used in Harris FM25K1, FM20/25K2, HT20/25FM, FM30/35K, and HT30/35FM series transmitters.


1 Broadcast Concepts LPF250FM Low Pass Filter in a metal enclosure with BNC jacks.  Allows 86 to 110 MHz through and has 45 dB rejection at 176 MHz and above.  Rated at 250 watts.  New, never used.  $80.00.  Photo 1  Photo 2
1 Broadcast Electronics 381-0001 Motor with gear head assembly used in many BE transmitters for raising and lowering power.  It is a Pittman GM9413E921 bi-directional motor.  Has a 426:1 ratio gear reduction for 9.1 revolutions per minute with 300 oz/in. torque.  Runs on 12 VDC at 135 m.a.  This unit was replaced when it was thought the motor did not work.  Later it was determined that the motor was fine and not the cause of a transmitter malfunction.   Used and in very good working condition.  $100.00.
1 CCA  570 uhy/5 amp RF choke.  Commonly used in a CCA 3 KW FM transmitter  Good condition.  $90.00
1 Dwyer Electronics 1820 5.  Adjustable air pressure sensor for use in a transmitter. Has air connections for the high and low pressure side of the diaphragm.  Has a SPDT switch to indicate adequate air pressure.  Used, but in good condition.  Photo  $40.00  (also listed on the AM transmitters page)
1 Omega PSW-581 Air Pressure Switch.  Used to sense air pressure on transmission lines for remote controlled alarms.  Has SPDT switch rated at 15 amp/250 VAC.   New unused in the original box and in excellent condition.  $35.00 each.  (Also listed in miscellaneous and coax connectors)
9 Harris 494-0004-000, Ohmite Z-50.  7 uhy/1 amp RF choke.  35 to 110 MHz.   Often found in Harris FM transmitters as the PA grid choke (L4 in the FM-20K transmitter).  Gates/Harris/Gates Air part number 494-0004-000.  $12.00 each.
4 RCA 210340 Feed-Thru Bushing, Ceramic (ceramic feed-through insulator).  Goes in 3/4" diameter hole.   Center hold can accommodate a #10 bolt.  Also known as NS5W4104 CAS and NS5W4204 CAS.  New, unused in original RCA factory box. (also in AM transmitter section)  $30.00 each.

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