05-21-2020, 06:03 PM
Gentlemen, I have an oscillator. It is very dirty reception but the barn burner at 1310 Kc is coming in with a great deal of static but very discernible. The only combination that I can find to work is using the primary winding, terminals 4-5 of the P-C70 oscillator coil. Wafer switch positions B1 to coil #4, B4 to coil #5. Won't work the other way around. I have attached trim cap, #29 to switch position B4, and it will let me peek and the dial position is very close. Works on switch position B1 too, slightly different trim. It's not perfect but I am pleased in as much as this is the first actual AM radio reception I have had out of this radio since I took it out of the box.
The 910 Kc radio station that I was trying to tune into before is only a 1000 watt station but the transmitter is lest than half mile from me. 1310 Kc is a 100K watt daytime station but it is about 20 miles from here. Now I have to trace the static, 1310 should blow me out of the garage. It's strong but so dirty. So far PB does not work. I might work on that next only because it will tell me if the antenna coil, which is shared by both PB and MT, is the source of this noise. FWIW adjusting trim cap 4B makes no difference in reception. Makes me wonder about that coil too. More coil rot?
Tips appreciated.
Have a great holiday weekend. Stay safe, stay well.
Tom
The 910 Kc radio station that I was trying to tune into before is only a 1000 watt station but the transmitter is lest than half mile from me. 1310 Kc is a 100K watt daytime station but it is about 20 miles from here. Now I have to trace the static, 1310 should blow me out of the garage. It's strong but so dirty. So far PB does not work. I might work on that next only because it will tell me if the antenna coil, which is shared by both PB and MT, is the source of this noise. FWIW adjusting trim cap 4B makes no difference in reception. Makes me wonder about that coil too. More coil rot?
Tips appreciated.
Have a great holiday weekend. Stay safe, stay well.
Tom
