1. Low Pass Filters
I just replaced the 4 BS170 of the PA of my Hi Band QDX and I replaced the "conventional wound transformer for 12V" by a "WTST for 9V wounding", expecting an increase of output power. With the former transformer and BS170 I got only 1.5W on 10M band.
Now I have the following output power in a dummy load:
- 30M - 2.70W
- 20M - 3.50W
- 17M - 3.40W
- 15M - 1.2W
- 12M - 0.6W
- 10M - 1.6W
What toroids should I tune by spreading or tighening the coils?
- L2 or L6 or both?
- L3 or L8 or both?
- L4 or L10 or both?
2. Band Pass Filter
The RF filter sweep shown by Putty gives:
- 30M minus14 from 10 to 12MHz then falling
- 20M minus15 at 14MHz? then minus23 at 15MHz
- 17M plus2 at 17.5MHz
- 15M plus6 at 21MHz
- 12M minus1 from 24 to 27MHz
- 10M plus4 from 27.5 to 31MHz
These results seem OK except for the 20M band. What should I do to the L12 toroid whin I built according to the manual to try to improve the 20M RF filter sweep and i the same time the 30M result?
About the 30M band, I just replaced in the "Band configuration" the 11M original settings by 30M settings with the same values as 20M (0 for both LPF and BPF numbers).
73 - Pierre - FK8IH?
?
Pierre - FK8IH