Hello Steve,
I have built exactly what you are looking for: a small 200 mW transmitter
that can be attached to a drone (including battery).
For the "PA" stage a I used a 74HC244 buffer, with all the gates paralleled,
feeding a resonant tank wound on a ferrite rod, which is also the antenna.
The battery is a single 3.7 V 500 mAhr LiPO. My -30 dBi two element loaded
loop array can "hear" it from about half a mile, far enough to do RX antenna
pattern measurements.
See : https://www.youtube.com/watch?v=JMujut_5FdY
GL and 73,
George
AA7JV/C6AGU
On Sun, 2 May 2021 18:46:49 -0600
VE6WZ_Steve <ve6wz@shaw.ca> wrote:
For field testing, I’m looking for some ideas for a very small RF amplifier to
boost the output from a HCMOS 1.843 MHz oscillator.
These oscillators will give me about 20 mW max, but I need a bit more since I
plan to mount it on my small drone and will need a bit more range.
My drone can lift up 130 grams, so I’d like it to run on a 5v supply. (maybe a
9v battery with regulator or 3 AAA cells)
I considered something like a Mini Circuits PHA-13ln 21 dB monolithic amp, but
not sure thats such a good idea.
A 2N5109 base amp is a current pig and too heavy.
Any ideas?
73, de steve ve6wz
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