QRP-80
•
17
45. Install C11, .001µF (marked .001 or 102).
46. Install L2, 100
µH
(brown-black-brown-silver)
The buffer stage is now completed and connected to the base of the power
amplifier stage, Q3.
47. Install R10, 270 ohms (red-violet-brown).
48. Install L3, 3.9µH inductor (marked LQ396 or with orange-gold-white
bands).
49. Install C14, .01µF (marked .01 or 103 or 10 nf).
50. Install C9, .01µF (marked .01 or 103 or 10 nf).
51. Install D1, 1N4002 (large black epoxy body), notice placement of
banded end.
52. Install L4, 100µH inductor (brown-black-brown-silver).
53. Install the slip-on metal heatsink on Q3. Insure that it does not contact
adjacent components.
The assembly of your QRP transmitter is now completed. If you somehow
skipped or improvised on our "halftime" instructions, NOW is the time to make
proper preparations for testing and using your transmitter.
As we suggest in all Ramsey Electronics kit projects, now might also be an
excellent time to take a break and then come back to re-check your
connections, or have a friend go over them. Give extra attention to the work
associated with Q2 and Q3. It's always easier to catch an error now, before
final testing. Easier on the cicuit parts, and. . . your ego!
INITIAL TESTS:
Connect the following to the transmitter:
•
Key, or keyer such as the Ramsey CW-7 CMOS keyer kit.
•
12-15 VDC power source capable of 500 ma output.
•
Resonant antenna with in-line QRP wattmeter, or 50-ohm 2-watt dummy
load.
For initial testing, your receiver may be connected through J2 of the transmitter
or to a separate receiving antenna.
Summary of Contents for QRP-80
Page 6: ...QRP 80 6 that will become obvious ...
Page 11: ...QRP 80 11 BLOCK DIAGRAM ...