Posts by dc4mg

  • What TX amplifier do you plan to use?

    I still have a nice linear PA, Mode A! from Comcast, former used in an Australian VSB TV Distribution Network , for using with Es'hail Sat . It is interesting that the engineers where able to combine 5 Transistors in a 3 double combiner network (I never had seen such a solution before).

    As I mentioned before , this is a class A amplifier with about 2A per final Transistor. It delivers a loot of heat for 17db gain . I am looking forward into the future with practical Es'hail experience, how linear this linear PA will be behave with DATV. Maybe I can reduce it to something like A with a little B, as every transistor has ist own poti for adjusting the drain current.

    vy 73 Hans

  • 20W WiFi Booster module for 2.4 GHz

    Quote from AvritSase

    Hi...I didn't find any ham radio 13cm power amplifier kit, it seems that some existed in the past, but I didn't find one available today.Also, it doses not seems that it exists any chip with an amplifier built in, like the MITSUBISHI & TOSHIBA module, that exist for VHF/UHF/1.2Ghz

    It's a quite easy way to DIY an amplifier.

    A possible solution for a DIY PA is the MW7IC2725NR1 : Modules are cheap from China, delivery about 3 weeks. Gain about 27dB , its a linear chip design for WIMAX with 5W Output, P1dB =20W. I have redesigned the NXP data sheet test circuit to FR4 material and waiting currently for the boards for building it.

  • Wie QRV werden?

    Übrigens, ich weiss nicht ob das schon bekannt ist, auf eBay bietet OE7DBH Quarze zu

    25.7884 x 390 = 10057.476MHz an, für eine ZF bei 432 Mhz .