70MHz (4m) RF Power Linear Amplifier, typical 8W in 50W out. Made in Dorset UK

70MHz (4m) RF Power Linear Amplifier, typical 8W in 50W out. Made in Dorset UK

70MHz (4m) RF Power Linear Amplifier, typical 8W in 50W out. Made in Dorset UK

70MHz (4m) RF Power Linear Amplifier, typical 8W in 50W out. Made in Dorset UK    70MHz (4m) RF Power Linear Amplifier, typical 8W in 50W out. Made in Dorset UK

The amplifier circuit and layout was created by me, Antony Nailer G4CFY of Spectrum Communications, in November 1991 and still uses the same printed circuit layout. It was designed for use as a single stage amplifier for 2m or 4m or 6m with devices to give 25W or 50W output. The 25W versions are no longer popular but there is a steady interest in the 50W versions. It uses a BLW60 device with a forward bias of 50mA and is tuned for peak power output consistent with an input SWR better that 1.2:1.
The 4m version gives 50W output for typically 8W input. The 50MHz (6m) version usually gives 50W output for 5 or 6W input. It comes with a 1 metre 42/0.2mm red/black twin power lead and runs from a 13.5V 10A supply and usually draws 6A continuous on DATA or FM, or peak in the case of SSB or CW. This is NOT a wideband amplifier but is tuned input and output followed by a low pass filter to reduce harmonic outputs to -60dB or better.
It is RF sensed including the unique Spectrum communications monostable RF switching circuit giving fast attack and 500ms hang time to avoid relay chatter when on SSB. The item "70MHz (4m) RF Power Linear Amplifier, typical 8W in 50W out. Made in Dorset UK" is in sale since Sunday, August 16, 2020. This item is in the category "Mobile Phones & Communication\Radio Communication Equipment\Ham/Amateur Radio\Ham Radio Amplifiers". The seller is "spectrumcomms" and is located in Dorchester. This item can be shipped worldwide.
  • Features: multimode
  • Number of Outputs: 1
  • Number of Inputs: 1
  • Custom Bundle: No
  • MPN: TA50W4M
  • Bundle Description: not applicable
  • Band: 70MHz (4m)
  • Unit Type: Unit
  • Audio Inputs: none
  • Number of Channels: not applicable
  • Country/Region of Manufacture: United Kingdom
  • Signal Gain: 8db power gain
  • Compatible Product: none
  • Colour: plain aluminium
  • Year Manufactured: Made to order
  • Audio Outputs: none
  • Model: TA50W4M
  • Power: 50 W
  • Unit Quantity: 1
  • Supported Modes: All modes
  • Brand: Spectrum Communications
  • Type: Linear Amplifier

70MHz (4m) RF Power Linear Amplifier, typical 8W in 50W out. Made in Dorset UK    70MHz (4m) RF Power Linear Amplifier, typical 8W in 50W out. Made in Dorset UK