J J Glass Co

1624 S. Main St., Los Angeles 15. Calif.

Weekdays 9-5 Fridays 'til 9

W7ATK's he avy duty model. Rear left rf stage; front left mixer with tapped slug-tuned coil covering 80, 40 and 20; front right I2AT7 oscillator —if cathode follower. Photographed under conditions of constant bragging,

premium for an RAX in better shape, Tliey replied that my description probably could apply to the balance ol lliese receivers on hand, and that I should expect additional units to be in comparable condition, I did, and they were. So ii you get sand in your shoes think nothing of it. Just dismantle, clean and lubricate. It s a lot better than rust and corrosion, and in the past year my receivers have been used a lot with no component failures. Fifteen dollars isn't much to pay for a reliable broad cast and beacon band receiver with excellent stability, good selectivity and low noise contribution.

The other qualifying note, referred to ear* lier, is in reference to the expedient of simply hooking an antenna and coil to the "'Like Newer/' As you would guess, skipping pre-selection can pay off in images, I attacked this situation slantwise by using three surplus crystals for forty meter reception. Normally I use 0000 kc and tune forty from 1000 kc to 1300 kc on the RAX-1. This gives the advantages ot direct calibration and best image ratio for the circuit, If a troublesome image does pop up 1 switch to 6500 kc and tune from 500 kc to 800 kc. With a 6800 kc crystal and tuning from 300 kc cranking in the sidebanders on the high end is good fun. You don't need a steady hand. In fact the receiver seems broad until you count the kilocycles on the dial. The fact that the best image rejection is on the top band and the best bandspread on the lowest band you can call flexibility or natural contrariness. Of course if you do the job right and use W7ATK*s circuit you can forget about images. The coil and condenser combination lie gives covers eighty and forty, and a 3000 kc crvstal can be used for both bands. The circuit for the RAX 1 is in Kenneth Gray sons "Surplus Schematics Handbook. , . . W7IDF

+1 0

Post a comment