Amp UK Discovery 70cms UHF High Power Valved Linear Amplifier
The 70cm Discovery is a desk top linear RF amplifier with a nominal output of 800W covering the range 430-440MHz for amateur radio use. The amplifier is fully operational. A mains lead is included. The handbook is available on the Internet.
Dimensions14in wide x 9.75in high x 17in deep 360mm x 250mm x 430mm Weight25kg. 11dB nominal Power requirements230V AC at 15A, 50/60Hz Duty cycleFull O/P with normal amateur service Cooling.. 430-440 MHz Input impedance50 Ohms with tuned I/P circuit Valve........................... Harmonics3rd harmonic: better than 45dB Plate voltage.. SSB: 2800V DC Cabinetchassis Zintec steel, covers aluminium RF compartment aluchromed aluminium.
Antenna relay24VDC antenna relays automatically transfer the driver to the antenna when in STBY or OFF. Standard in-built are coaxial O/P relay and short throw I/P relay. The amplifier requires a relay contact in the driver to key the amplifier.
Plate current, Grid current and RF O/P Protection AC fuses, Grid over-current, Plate over current, Internal valve flash-over, over-drive, soft start, Warm-up timer. Amp UK Discovery 70cms Amateur Radio Valved Linear Amplifier.
Please examine the photos for external condition. The 70cm Discovery is a high quality linear amplifier, which is designed around a GS 31 medium mu triode in grounded grid configuration. The amplifier is forced air cooled to give you the ability to operate at full output power for as long as you wish. The recommended maximum drive is 100Watts.
The new model of the Discovery features a specially designed Triode control board by G3SEK. This control board incorporates all the following protection features:- Grid over-current, Plate over-current, Internal valve flashover and Overdrive. It also has sequenced relays and high speed switching relay. The GS 31 must be allowed to warm up properly hence a 3 min. Start up timer is fitted. When the amplifier is switched on, the yellow WAIT/GRID LED comes on. After 3 min has elapsed the WAIT light will go out and the green READY LED will come on allowing you to operate the PTT.
It is recommended that you use a Bird (or equivalent) power meter capable of measuring 1500W at the correct frequency. Please read the instructions carefully before operating the equipment. RF amplifiers at this power level and frequency can be easily damaged by improper use. Please follow the precautions on page 1 of this manual. The Discovery is fully self-contained and has three separate voltages:- 1.
HIGH VOLTAGE which is 2800V, the main voltage applied to the valve anode. HEATER SUPPLY which is 13V at 3A. CONTROL VOLTAGE which is 20V used for the LED control condition of the amplifier, also for pulling in the Tx/Rx relays. ON/OFF SWITCHMains power on and off. 0 1.5A, monitors the plate current of the valve.
0 400mA, monitors the grid current which should not rise above 300mA. Switches the grid meter to monitor relative RF O/P NB. On the 70cm Discovery there is no relative RF O/P, so the switch only operates in the GRID position. Adjusts the loading of the strip-line Internally preset.
TUNE CONTROLAdjusts the tuning of the strip-line. Indicates an internal valve flash-over (for re-set see page 7). Lit until the valve has warmed up and then goes out when the amplifier is ready to use If this LED comes on during use it indicates that there is a fault (see note on page 7 for reset). READY LEDShows amplifier is ready for operation TX LEDShows when the amplifier is transmitting. The item "Amp UK Discovery 70cms UHF High Power Valved Linear Amplifier" is in sale since Sunday, August 11, 2019.
This item is in the category "Mobile Phones & Communication\Radio Communication Equipment\Ham/Amateur Radio\Other Ham/Amateur Radio". The seller is "iain14500" and is located in Alton. Will also deliver to M4 service.. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, Bahrain, Canada, Japan, New Zealand, China, Israel, Norway, Indonesia, Mexico, Switzerland, Bangladesh, Bermuda, Bolivia, Barbados, Brunei darussalam, Cayman islands, Egypt, Guernsey, Gibraltar, Guadeloupe, French guiana, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Martinique, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Saudi arabia, South africa, United arab emirates, Chile, Bahamas, Colombia, Costa rica, Guatemala, Honduras, Jamaica, Kuwait, Panama, Qatar, Trinidad and tobago, Uruguay.
- Country/Region of Manufacture: United Kingdom
- Band: UHF