Up
For sale is one Harris AM-7223 linear power amplifier. It is a military surplus unit that the military rated as condition A4 (see picture), which means perfectly usable, serviceable condition. I tested the unit and found it to power up and self test fine. (see below). You are getting a perfect deal: the amplifier, (no cables), operator, maintenance and depot service manuals on CD, tested, etc, in factory heavy duty shipping box. No risk involved here, unlike with some less well tested units or ones without accessories. The pictures are of the actual unit.
Please note that the On/Off switch is not working and is permanently in the ON position. It was broken due to my fault and I soldered a little wire for it to be in the ON position)
Maximum rated RF output power: 500 Watts PEP when loaded with two tones driven by the transceiver. 250 Watts continuous average power with a CW input signal or single tone input signal. RF Drive Required : 65 Watts for full power output Automatic tune time: 10 Seconds Maximum Dimensions: Height : 7 inches Width : 16.75 inches Depth : 20.5 inches Weight : 78 lbs.
This amplifier was built to withstand severe vibration, extreme temperature ranges etc. It has numerous safety shutdowns, for example if there is not enough cooling air etc. It is also extremely tolerant of the quality of input AC power. It can, with minimal effort, be coupled with other transceivers.
This unit comes with manual and original shipping box.
Unlike other Harris amplifiers you see sold on ebay, this item has been tested. The unit powers up. It passes a self test (see last picture) Note that it needs a DC signal applied on the serial cable as a signal to start up. If you simply plug it in and turn on, nothing will visibly happen until you apply said voltage. I will explain what to do if you buy this unit. That's the signal from the Harris transceiver but you can replicate it with any DC supply or simply regular batteries. It does not have to be accurate voltage, my technically inclined 3.5 year old turned it all the way up to 50V and the unit did not notice. All it needs is a "signal" on one of the pins. There is power on the output with my wattmeter agreeing with the wattmeter built into the Harris unit. Unfortunately, I do not have a spectrum analyzer to verify linearity of this amplifier. Please click on thumbnails to see numerous high quality pictures of this unit. The unit passes the self test.
Included is:
J-1 is the power jack. Pin P is Ground. Pin J is Hot. Pin A is Common. If you look on the inside of the jack you will see the Green, Black and White wires going to these pins J . I have no idea what the other pins are for.
J-2 is the interface cable to the RT-1446. If your going to use the LPA with the RT-1446 just get a straight through DB-25 male to DB-25 female cable from the computer store. Hook J-2 on the AM-7223 to J-8 on the RT-1446.
I have (attempted to) set this amplifier up to run with a different transceiver than the RT-1446. Connectors on J-2 become important when trying to do this. Pin 7 is LPA ON/OFF. Bring High for on, Low for off. Table of pin descriptions. I'm not sure of how the other pins function yet. About 35 to 40 Watts will drive the LPA to 500 Watts. About 45 to 50 Watts will drive it to over 600. More than 50 Watts drive brings no increase in power. I suspect the amp is capable of more than 500 or 600 Watts, but is regulated to maintain the continuous duty cycle rating.
What is NOT INCLUDED is the thick black Harris antenna cable. This cable is the only cable shown that is sold SEPARATELY. You can have it for $80.00, no shipping charge. Original prices was $140. It is 25 feet long and can handle the amplified power.
Some useful information:
Shipping: The unit will be shipped in the airtight foam protective case. A UPS label will be slapped on it. The weight of the package will be 130 lbs. Buyer to pay actual shipping, no handling charges apply. Item will ship from Lisle, IL 60532.
