In my last entry about the Halli HA-5 VFO checks I made, I found that the 40-10 bandswitch didn’t change the output of the VFO — it remained steady on 40 Meters regardless of the selected band. Well, the answer is simple enough if you look at the schematic and how the bandswitch is wired.
Top left, SW1E section of the bandswitch determines which crystal is in the circuit (factory only installed two for the HF coverage, user had to add xtals for 6 and 2). See those four band positions below the Y2 crystal? Yep, that’s 40, 20, 15 and 10 meter positions.
The same goes if you look at the coil switching arrangement at the top right. Segment SW1F is the power off/on part of the bandswitch, which explains why there are 7 “on” contacts vs. one “off.”
The transmitter one would normally pair with this VFO was the HT-40, and for that rig, this VFO put out the correct output to match the transmitter. The transmitter did the work of bringing the right signal thru to the antenna with the proper coils and inductors.
I’m interested in putting the station on the air, but that’ll have to wait a bit.
Gotta run … have a great day!
73 de KY4Z SK CL … dit dit …