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On 4/19/2010 10:36 AM, Roger Johnson wrote:
carlos10 wrote: hi, have here a valiant ii transmitter without the crystal dummy knob, to cover the crystal holder, now in the hole someone put a 6,3 audio female audio plug, thas can easely removed, deeper a see a radio tube socket, seems to be original, question, how do you put the cristals in place, is there somthing to plugin in the tube socket, what parts most be present to work with the crystals, can you change crystals from the frontpanel hole labeled crystals thanks carlos You can plug 2 of the old FT-243 style crystals into an octal socket. You will have to look in the manual for the proper orientation. 73, Roger Hi, You can also use two type HC-17/U fundamental mode crystals in the octal socket. You should specify 32pF load capacitance when you order them. Most crystal suppliers no longer offer crystals in the old FT-243 holders. The type HC-17/U holder is the same as the modern, hermetic, HC-6/U holder, but has thicker pins to mate with the sockets that were used with FT-243 crystals. The crystals take the place of the VFO, whose output frequencies were multiplied to get to the higher bands. So if you want a crystal to operate on 14,200 , 21,300 or 28,400 you would plug in a 7,100 KHz crystal. The manual has the chart of which crystals to use for the desired band. 73, Ed Knobloch |
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