Wayne, That's interesting. I have some Times Microwave Systems cable that looks exactly like RG223. The numbers on the cable state 68999 AA-8338. I contacted TMS and got the following information. The 68999 is a "Code Identification number" the AA-8338 is the drawing number. The following provided specs are stated as.
RG142 type with Polyethylene Jacket. Center Conductor: Solid Silver Plated Copper 0.037". Dielectric: Solid Polytetrafluoroethylene 0.116" (try saying that fast 10 times). First Shield: 36 Ga. Silver Plated Copper 0.139". Second shield: 36 Ga. Silver Plated Copper 0.162" Jacket: Black Polyethylene. Recommended minimum bend radius: 2.5" Weight per 1000 ft (Nominal) 40 lbs. Operating Temperature: -40 to +80 C. Impedance (Nominal): 50 Ohm. Velocity of Propagation (Nominal): 69.4 %. Capacity (Nominal): 29.3 pf/ft. Attenuation @ 400 MHz (Typical): 8.7 dB/100ft. Power rating @ 400 MHz (Typical): 375 Watts. Return Loss (50 MHZ - 2 GHz): 20 dB. 73, Tony VE3DWI ************************* From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Eric Lemmon Sent: May 12, 2008 23:20 To: [email protected] Subject: [Repeater-Builder] Times Microwave RT142 Cable - UPDATED Wayne, My contact at Times Microwave Systems advised me that "RT-142" is a triaxial cable in their "REMIT" specialty product line. The name refers to "Reduced Electro Magnetic Interference." Although Times does claim that "RT-142 is manufactured in accordance with the material requirements of MIL-C-17" it is not a QPL-listed product. Times will not mark the jacket unless specially requested by the customer. Here are the specs from the REMIT catalog page: Inner Conductor - 0.039" SCCS Dielectric OD - 0.116" Dielectric Material - Not specified Shield Braids - SC Shield Coverage - Not specified Jacket Material - FEP Jacket OD - 0.215" Nominal Impedance - 50 ohms Nominal Capacitance - 29.4 pF/ft Max Operating Voltage - 1,900 VRMS Max Attenuation at 400 MHz - 9.0 dB/100 ft Velocity of Propagation - Not specified If this cable is used in place of double-shielded coaxial cable such as RG-400, the insulating barrier should be trimmed back from the connector clamping or crimping area, so that there is positive metal-to-metal contact between the shields at both ends of the jumper. Care must be taken to select connectors that fit the dielectric without slop; otherwise, a significant "impedance bump" will occur at the cable/connector interface. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@ <mailto:Repeater-Builder%40yahoogroups.com> yahoogroups.com [mailto:Repeater-Builder@ <mailto:Repeater-Builder%40yahoogroups.com> yahoogroups.com] On Behalf Of Wayne Sent: Sunday, May 11, 2008 8:34 PM To: Repeater-Builder@ <mailto:Repeater-Builder%40yahoogroups.com> yahoogroups.com Subject: Re: [Repeater-Builder] Best coax for short jumpers in repeater cabinet? I have some cable that I cannot find the true information for. it is labeled as follows: 68999, TIMES MICROWAVE SYSTEMS, RT142 It is not listed, at least not readily seen, on the Times microwave web site. It appears to be a version of RG142. It is tan outer cover Double shielded, high density silvered (or tinned) with insulation between teh two shields.. clear solid inner insulation, and stiff solid center conductor. I bought it to use as RG142 for jumpers. It looks virtually the same as some labeled RG142 that came with a Micor UHF duplexer, though less flexible than the RG142 seems to be. I now wonder if it is interchangeabe or not? I have never seen any cable labeled RT instead of RG... Wayne WA2YNE
