Hall A uses RG-58C/U to carry the electrical pulses from the photomultiplier tubes to the trigger electronics. The cables are 37 feet long for most phototubes. All cables carrying phototube signals have a nominal 50 ohm impedance to avoid transmission line mismatches. Some cables have an additional length of RG-174 added. This is done to define a reference time for the detectors.

Recommended RG-58 cables.

RG-58C/U is in the stock room under stock number 614530015

Typical RG58 Coaxial Cable Specifications

RG/U
Type
Cable		 Inner
Conductor
(Ohms/1000ft)		 Dielectric
Material		 DOD Number/Type
of Shielding
Braids
(Ohms/1000ft)		 O.D. Weight
(lb/ft)		 Nom.
Imped.
(Ohms)		 Nom.
Cap
pf/ft		 Max.
Operating
Voltage
(Volts RMS)		 Comments
58 .0320 BC
0.81
(10.8)		 PE .116
2.95		 1 / 95% TC
(4.1)		 .195
4.95		 0.029 53.5 28.5 1400 Use RG58B
58A .0355
0.9
(10.8)		 PE .116
2.95		 1 / 95% TC
(4.1)		 .195
4.95		 0.029 52 28.5 1400 Use RG58C
58B .0320 BC
0.81
(10.8)		 PE .116
2.95		 1 / 95% TC
(4.1)		 .195
4.95		 0.029 53.5 28.5 1400 Use up to
1000 MHz
58C .0355
0.9
19/.0071 TC
0.8
(10.8)		 PE .116
2.95		 1 / 95% TC
(4.1)		 .195
4.95		 0.029 50 30.8 1400 Extra Flexible
Version RG58B
Back to Jack's Notes