[Hallicrafters] Tech Tip - SX-117 XTAL 2

[Duane Fischer, W8DBF]

Dear Duane,
I have no idea, as I said, what the crystals are. However,
9.5 megahertz
and 18.0 megahertz crystals are required to align the
preselector.

The 9.5 megahertz crystal goes in auxiliary socket number
one. The 18.0
megahertz crystal goes in auxiliary socket number two.

The crystal selector switch is a five-position switch. In the
normal
position, plate voltage is removed from the auxiliary crystal
oscillator
(6EA8 not supplied) and the receiver will operate on the
ranges
indicated by the band selector knob.

Positions one and two of the crystal selector switch will
disable the
12AT7 first crystal oscillator, apply voltage to the 6EA8
auxiliary
oscillator, and select crystals inserted in auxiliary sockets
one and
two. Use only type CR-18/U crystals whose frequencies fall
between 6.5
and 20.00 megahertz.

Positions three and four also disable the 12AT7 first crystal
oscillator, and select crystals inserted in auxiliary crystal
sockets
three and four. Use only type CR-23/U crystals whose
frequencies fall
between 20.5 and 34.0 megahertz.

73,

John, W4NU
Atlanta


Duane Fischer, W8DBF - WPE8CXO
E-Mail: dfischer at usol.com
Hallicrafters web site: www.w9wze.net
HHRP web site: hhrp.w9wze.net