Project Minima has come to the end.

The distance to IW2KGW is 1569 km, report 44, antenna 3 el Beam.

The distance to SP6PYP is 789 km, report 57, antenna sky-loop 82m.

Modification not menschen earlier.

CW modulation take the signal from collector T17 and R43 connect 2,2uF and serial 180kohm to mic in.

This was adjusted after R33 220ohm changed to trim pot 500 ohm, to adjust modulation from mic.

100nF put in LP-Filter close to T+ pin (input regulator).

100nF put in LP-Filter close to +12V pin (input regulator).

I have no run QSO on 80m, 40m and 20m. I rely like the little fantastic Rig. It has built in CW memory for short CQ. Also QRSS Message not practiced yet. I think I have not found all feature yet.

It is close to unrealistic what is possible with this small rig. Width 18cm Depth 20cm Height 8cm Weight 1150 gram.

No I stopped soldering, no more measurement and go for practice with this QRP MINIMA.

If its unclear wat I have done you are welcome to email (Calsign@gmail.com) if you won’t more detail. Or put in a comment down hear.

SW is very close to Eldon Brown work really nice,  Eldons Code TANKS a Lot.

I add a Rx-preamp  +14dB its perfect when its weak signals.

Hope to her you on the band.

73 de SM4HNG Leif

Hard to get all parts in minima to working together.

I have used the receiver in the summer to listen on 80m band, when I was in the shack. Now when all puts together it starts sound very strange, I found out that the capacitor 330uF clos to LM386 Vcc was not connected! It solves this problem.

Strange behavior when modulation, needs more decoupling at mic amplifier T13 R34 10 ohm changed to 47 ohm, C43 50uF changed to 470 uF.

To get little more drive I change PA-Drive 2N3904 emitter resistor from 22 to 10 ohm, see Pa driver.

In transmit the modulation passes to LF amplifier, a FET 2N7000 shorts T15:B to ground, gate to 47kohm to +T.

Found that output is rather high even if no modulation. Put in a classic 10 turns trim pot 100 ohm to D3,D4 give around -40 dBc with no modulation.

Last problem on 21, 24 and 28 MHz is lot power when touch ptt., found out that shielding was needed between LP-Filter after PA and LP filter on main board(60 dB gain).

I will try to put up a vide as proof of working transceiver, its not a hi-tec. TRX but its working and I have learn a lot. Have made around 10 QSO, One Sweden to Netherland 59 report on 40m.

Stay tuned one last nots from this project.