Home |
Search |
Today's Posts |
#9
![]() |
|||
|
|||
![]()
On Sun, 13 Apr 2014 09:54:23 +0000 (UTC), "Geoffrey S. Mendelson"
wrote: - If you're doing HF (2-30 MHz), you don't need a low noise front end, and you certainly are going to need a high IP3 amp. To be exact, I am looking for MW broadcast using the loop. and lower HF bands (80m/40m/6mHz SWBC) using a short antenna, similar to a PA0RDT type (in only that it is a short wire/pole connected to an amp). The PA0RDT design is a "mini-whip" not a loop. http://dl1dbc.net/SAQ/miniwhip.html Very different. Could you be more specific as to what you're trying to accomplish, and what you have to work with? Meanwhile, I suggest grounded base. (My thanks to MikeK a.k.a. amdx for the references). I've built similar amps but never realized where they originated. The big advantage of grounded base is that it's very very very very stable. http://www.thegleam.com/ke5fx/norton/norton_rohde_lankford.pdf http://www.thegleam.com/ke5fx/norton/lankford.pdf http://www.google.com/patents/US3891934?dq=3,891,934 Details. Note that the design was not made for an HF receiver amp: http://www.cliftonlaboratories.com/norton_amplifier.htm 11dB gain. +50dBm IP3. 100mw out at 1dB gain compression. Wheeeee... You could probably use it as a QRP transmitter. More later. I'm rather busy today. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Hayward design broadband low noise preamp for loops | Antenna | |||
Questions on broadband antenna design (e.g. T2FD) | Antenna | |||
Full wave loops - alternate design? | Shortwave | |||
Noise and Loops Question | Antenna | |||
Advice Needed for Super J-Pole Design: Inductive Loops Overheating | Antenna |