Concord Nk Fone

is marked "48.222 MC " After being multiplied, it gives a frequency of 144.666 mhz. The frequency of the monitored repeater is 145.100 mhz; therefore, the if frequency is 433 khz. The if transformer has been shifted 22 khz,


First adjust L-3 in or out until oscillator oscillates. This can be determined by your regular receiver tuned to the multiplied oscillator frequency. Then check for repeater activity. If on, tune first // until repeater is heard, then peak for maximum, then the same for second if transformer, then peak C-2 for maximum and C-l for maximum (if used).


This receiver has given excellent reliability, has a narrow bandpass, no drift problems, small in size (5" x 8" x 4"), light weight and low power consumption. By their basic design, any ac/dc radio is dangerous when out of its case. Be sure to remove power cord before working on chassis. In tuning, use insulated tools, stand or sit on insulated material.

Any of the conventional noise clippers or squelch circuits may be used if desired.

Thomas Niederwier, WA8IYL Box 263

New Washington, Ohio 44854

The tower here that supports the two meter ground plane and twenty meter inverted dipole also serves as a forty meter vertical. It consists of thirty three and one half feet o one and one quarter inch pipe insulated at the top and bottom with a dielectric pipe union- These are available at most plumbing stores- This type pipe connector makes it easy to put several antennas on one pipe and insulate them from one another. These dielectric unions have a built in spark gap which makes the whole thing a fairly good lightning rod.

The two meter ground plane is constructed on a one inch pipe cap as shown in the Antenna book. The inverted dipole is also right from the book. I have a twenty meter dipole, but one can be put up for any band.

A five foot section of one inch pipe was used between the ground plane and the vertical here, but any length can be used to get the height you want. Although too much height might get you into support problems.

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