Page 321 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits

lossy resistor. However, 900

in parallel with 200

516З

. The 900-

resistance lowers the Q of the coil (and the IF amplifier gain) Ьу about 20 percent
because 16З k

fV 80 peгcent of 200

If the collectoг of Q1 is connected to node А and not to а tap of the pгimary
winding, the output resistance of the tгansistor will dramatically load down the Q
(Figuгe 17-28). In this figuгe, the collector is connected to node А, ог the full

winding of the coil. Therefoгe, го 5 100

is now in paгallel with the 200-

resistor across nodes А and С of the coil, which then results in ап equivalent
resistance of 67

across the fuH primary winding of Т2, which is one-third of 200

. 8ecause of this dramatic dгop in гesistance,the Q of the coil now has dropped Ьу

two-thirds, ог 67 percent.