Re: Amplifier Talk- Communications Concepts
¿ªÔÆÌåÓýI know Helge and what you say is not true.? His RF designs are outstanding still today.? His work pioneered matching transformer designs for transistor devices, taking into account many parameters (saturation, capacitance, stray inductances, etc. over frequency).? His designs incorporated temperature compensated bias for thermal creep, and some later used RF chokes to offload current flux and pre-saturation from it in the RF transformers¡ something that few designs do even today. ? Now, if you mean that his amplifier boards didn¡¯t incorporate filtering to meet FCC regs (etc, name your country)¡ yes that is true.? This is because as you say his designs were demonstration designs, and it was left to the designer to add such filters¡ But that is true of almost everything you buy off eBay today except for complete amplifiers. ? MRM
? From: [email protected] [mailto:[email protected]] On Behalf Of Razvan Fatu ? The Motorola Helge Granberg designs are almost 30 years old now. Keep in mind they are only engineered to the level that demonstrates the functionality of a part and since then there have been important developments in materials and components. Once you understand that, designt he rest of the required circuitry and the right output filters, you might end up with a decent amp. -- ¡_. _._ |
MadRadioModder