Ramsey Electronics FX-440 Manual page 138

the best-sounding speech. "Best" is NOT necessarily the
maximum: see the following note.
NOTE: R46 adjusts the FM deviation of the transmitted
frequency. Deviation is carrier frequency swing in step with voice
modulation. If you "over-deviate,• your signal will NOT be
stronger. Instead, the speech will become distorted and "splash"
over to adjacent channels. Deviation is a very important
adjustment: "best sounding speech" will usually result in the
proper
±
SKHz deviation used on VHF FM.
9. Disconnect power and proceed with completing the transmitter section
(Steps TX15, etc.)
IMPORTANT: If you do NOT achieve the test results discussed above,
there is no point in doing more work on the transmitter section until the
problem is solved. If you are not able to transmit at least within the same
room and receive on any desired frequency, finishing the transmitter is
not going to fix the problem.
CONTINUE TRANSMITTER ASSEMBLY:
[ ] [ Vj TX15. Install L19, .015 uH coil and ferrite bead assembly. Select
: a . 015 uH coil (the small
2
turn pre-wound coil) and a ferrite bead.
Slip the bead over one of the coil's leads and install the part as
you normally would. It is not important which lead the bead is
slipped over. Ferrite beads, when strung on a wire, act as small
RF chokes which are functional over a wide frequency range.
n.FERRITE
~BEAD
[ L LL
JX16. Install C61, .001 uf.
[ ] [?,<l
TX17. Install C66, 10
pt
( ) [l}:
TX18. Install L 18, .015 uH coil and ferrite bead assembly. This
assembly is the same as the one in step TX15 above.
[ ) [. 1
1
J
TX19. Install L 14, the 1.5 turn hand-wound coil you made in step
I
TC2. .
/\
[ ] [ v]
TX23. Install C60, electrolytic, 220 uf. Watch polarity.
Install these remaining transmitter parts:
[ ] [ ] TX24: C58, the last . l uf. capacitor.
Assm; 76
FX-440