These amplifiers work real linear amplifiers and not as a C class device, as many simple CB type amps do. A special feature the amplifiers have a six-way output low-pass filter, which is switched automatically by micro processor. Additionally this filter can be switched manually e. The relative output power is shown on a bar graph on the front panel. The amplifiers have a protection circuit against high SWR. The HLAV operates from 1. There are 6 filters built-in to suppress harmonics, which are switched automatically but can also be switched manually for special operating conditions.
In most respects it is a typical grounded grid linear amplifier, with the exception of a rather unique tuned cathode input circuit that was developed by Pat over 10 years ago. The coaxial input coil is resonated in parallel by a pf variable capacitor C3 , which is mounted above ground and tuned with an insulated shaft. The LC circuit is shunted by a 2. For this reason it is necessary that C3 have off-center rotor plates for ease of tuning the higher frequencies. With the input tap position on L2 set properly, a near-perfect 50 ohm input impedance will be realized on all bands.
Welcome, Guest. Please login or register. Pages: [ 1 ] 2. It amazes me how this rather simple designs are kept so secret.
There seems to be a problem serving the request at this time. Ham radio offers a way for people around the world to keep in touch without using pre-established communication grids. It is suitable for anyone who loves wireless communication or the idea of pottering about with electronics.