Version: 13. September 2004
19
onto the body. Put 22 turns on the body,
and then again go down through the
notch at pin „ende“. Put the turns around
the lead. And you‘re done.
Fix the coil in a vice and solder wire and
pins at the same time. This is easy: Touch
the wire and solder with the soldering iron
at the same time (LITTLE solder!). Don‘t
push too hard. The leads become hot, and
the plastic soft! Check for contact with an
Ohmmeter.
All well? Then screw the core into the plastic holder till it is flush with the
top. Please take care not to set it askew. Solder the coil onto the pc board,
and put on the covering core. Loosely fit the can, but don‘t solder it yet.
[ ] L7
Neosid filter 7.1 F10b B1
22 turns 0.1mm lacquered copper wire (AWG 38).
We only have to put in 3 pins, to finish this section
[ ] pin 28
C/D2
[ ] pin 29
D2
[ ] pin 38
E2
Test Section 5
1. Visual inspection
(see Section 1)
2. Resistance test
(see Section 1)
[ ] Apply supply voltage as in Section 1 test.
3. Smoke test
(see Section 1)
current about 65 mA
4. Functional test
Connect pin 29 to +10V (e.g. pin 18 or pin 47)
Put trimming potentiometer in centre position.
Put your link wire from Section 3 close to T10 position and tune the recei-
ver to about 8.000 MHz. You should hear the BFO loud and clear. P8 should
tune the BFO +/- 1 kHz.
With an oscilloscope, you should be able to see the 8 MHz signal at C97
and adjust it to some 300 mVpp.
If you have no Scope, you may use the calibrated RF probe available from
QRPproject or another type of RF probe.
If everything is OK, proceed to Section 6.
