When reinserting the radio into the case, take care to align the radio on the guide slots. Tuning is accomplished by means of two separate crystals an antenna coil, and a tank coil. The receive crystal frequencies are kHz above the desired frequency. Often the receive crystals for the BC will have the crystal frequency on the front and the actual receive frequency on the back. BC receive crystals show the crystal frequency on the front and the receive frequency on the back Only one crystal is needed in the radio.
Range is 1 to 3 miles. The ON switch is activated by pulling up the bottom antenna section. The FT battery adapter takes two BA "D" cells and connects them in parallel yielding a longer lasting 1. The "-F" version has a jack for external audio accessories like the HS headphones, T throat microphone, T lip microphone.
Frequency Conversion Kit MC contains crystals and 72 antenna coils and 60 tank coils. This allows using any of 50 frequencies in the radio. To change frequencies the Rx and Tx crystals are changed along with the load and tank coils. No alignment is needed when changing frequency. The Rx crystal is kHz lower or higher than the Tx crystal which is on the channel frequency.
As a few of you know, the ferrite slugs in the IF transformers of the BCF are tender", and the adjusting slot often breaks off when you try to do an IF alignment. I've been fighting with what initially looked like a mint condition chassis for the last two days. So far, I've discovered the following. Most but not all of the remainder of the slug can be pushed out or blown out with LP air. The slug and beeswax residue that won't come out using those methods means certain death to the first replacement slug that you try to install.
The solution is to run a bottoming tap into both ends of the transformer, turning it only with your fingers do NOT use a tap wrench until it contacts the unthreaded area in the middle of the transformer. The trivia is that the threads are , probably the least commonly available thread in North America. However, some of the larger machine tool supply houses still seem to have a small number of the taps in stock. I bought a set this morning, along with a die JIC.
Another BC tip not mentioned in any of the manuals. It is much easier to align the IF's no noise to contend with if you do it with the coils and crystals removed. By now, quite a few of you have bought C. Litrico's converters for the BC, either directly from him or off the web site in the UK. I have several here and other than in the late BCF with the thick bottom cover , they all work OK. However, when you shake the set, because the original BA was rectangular in cross section rather than square, there is enough room for everything to rattle around pretty severely, sometimes enough to cause the inverter to stop.
Width is the width of the protector. Length is the length of the three D-cells. Bevel the end toward the bottom cover so that the D-cells will drop in without catching on the spacer.
Notch the bottom to clear the B-battery ground spring and the two bosses cast into the top cover. My laptop, ordered on Monday for delivery on Wednesday, still hasn't arrived, so I'll be totally out of touch for a while from tomorrow Sunday.
II vintage "Handy Talkie". Used in large numbers. The BC is a version for use in Gliders and has an 8 pin Jones plug on the enlarged bottom plate battery cover. Behind the sliding door above and to the right of the PTT switch there's an antenna disconnect switch that's activated when the BC is installed in it's mount.
The Antenna Coil, Tank Coil and crystal need to be changed for each frequency. Replacement of press-to-talk switch Chassis removal Replacement of microphone Replacement of earphone Replacement of on-off switch Replacement of antenna Replacement of resistor-capacitor cups Replacement of tubes Changing coils and crystals Removal of eyelets Replacement of IF transformer Unsatisfactory equipment report Alignment and adjustment.
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