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Satellite TV receivers & systems support forums
Multi-receiver/TV systems - Domestic only
I hope this is the best section for this, as the query(s) are interconnected
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<blockquote data-quote="PaulR" data-source="post: 1128056" data-attributes="member: 176256"><p>Although supposedly all made to the same physical dimensions there are often fractions of a millimetre difference in outside diameter, usually because of the thickness of the outer plastic cover. The ratio of sizes internal to that are all dependant on the diameter of the centre wire. The 100 in WF100 (and PH100, etc) means it is 1mm in diameter. In order to present a 50 ohm impedance the diameter of the braid and metal sheath has to be a fixed ratio away from the centre wire. Different insulation materials between the centre and the braid & sheath can vary this ratio a little but nowadays most insulation is semi-airspaced foam for minimum loss so will be the same in practice.</p><p></p><p>The F-plugs also seem to come with fractional differences to accommodate different overall outside dimensions but whether this is deliberate or just manufacturing tolerances I don't know. Certainly, in the field I have sometimes had to add a little PVC tape ensure that the plug isn't loose. Or try to ensure that the copper sheath either doesn't flake away or is underneath the braid if the fit is loose.</p><p></p><p>Sometimes I have to judiciously shave a little off the outside cable cover. Basically, whatever is needed to get a tight grip between the plug and the cable. </p><p></p><p>This is occurs on both screw-on plugs and compression type plugs. Probably crimp type as well although I've never used them.</p></blockquote><p></p>
[QUOTE="PaulR, post: 1128056, member: 176256"] Although supposedly all made to the same physical dimensions there are often fractions of a millimetre difference in outside diameter, usually because of the thickness of the outer plastic cover. The ratio of sizes internal to that are all dependant on the diameter of the centre wire. The 100 in WF100 (and PH100, etc) means it is 1mm in diameter. In order to present a 50 ohm impedance the diameter of the braid and metal sheath has to be a fixed ratio away from the centre wire. Different insulation materials between the centre and the braid & sheath can vary this ratio a little but nowadays most insulation is semi-airspaced foam for minimum loss so will be the same in practice. The F-plugs also seem to come with fractional differences to accommodate different overall outside dimensions but whether this is deliberate or just manufacturing tolerances I don't know. Certainly, in the field I have sometimes had to add a little PVC tape ensure that the plug isn't loose. Or try to ensure that the copper sheath either doesn't flake away or is underneath the braid if the fit is loose. Sometimes I have to judiciously shave a little off the outside cable cover. Basically, whatever is needed to get a tight grip between the plug and the cable. This is occurs on both screw-on plugs and compression type plugs. Probably crimp type as well although I've never used them. [/QUOTE]
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Satellite TV receivers & systems support forums
Multi-receiver/TV systems - Domestic only
I hope this is the best section for this, as the query(s) are interconnected
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