Hi Pete, The "Ideal" blue-banded connectors for RG6 are part number #89-055, and the black-banded ones for quad shield are #89-056. They both use compression tool #30-603. 73, Jim W8ZR
> -----Original Message----- > From: Topband [mailto:[email protected]] On Behalf Of Pete Smith N4ZR > Sent: Sunday, May 05, 2013 1:39 PM > To: [email protected] > Subject: Re: Topband: Problem with compression F connectors on Quad RG-6 > > Very interesting, Jim - I have been using Ideal connectors from Home > Depot, and they have no color band at all (nor do they have decent > instructions for installing). I will try to find some of the > black-banded ones (I have red-banded ones for RG-59). > > 73, Pete N4ZR > Check out the Reverse Beacon Network at > http://reversebeacon.net, > blog at reversebeacon.blogspot.com. > For spots, please go to your favorite > ARC V6 or VE7CC DX cluster node. > > On 5/4/2013 11:13 PM, Jim Garland wrote: > > I'm sure most of you know this already, but there are different compression > > F-connectors for ordinary RG6 and for quad-shield RG6. I use "Ideal" brand > > connectors with matching compression tool, and there is a color-coded band > > for the two types of cables (blue for RG6 and black for quad-shield). It is > > not always easy to find the installation instructions, but for quad shield > > especially, it is very important to follow the directions so as to make sure > > the multiple aluminum foil and braided shields make appropriate contact at > > the connector, just as Tom cautions. > > 73, > > Jim W8ZR > > > >> -----Original Message----- > >> From: Topband [mailto:[email protected]] On Behalf Of Tom > > W8JI > >> Sent: Saturday, May 04, 2013 6:08 PM > >> To: [email protected] > >> Subject: Re: Topband: Problem with compression F connectors on Quad RG-6 > >> > >>> I'm having a repeated weird problem with compression F connectors on > >>> quad-shield RG6. When I connect a short length (say 4 feet) of cable to > >>> my MFJ-259B, I would expect R>650. Instead, when I wiggle the coax, > >>> occasionally I see the display change to R=0 and X= several hundred ohms > >>> at 1.8 MHz. This makes no sense to me - the R implies ashort, but > > where's > >>> all the X coming from? > >> R doesn't come from a short, it comes from no loss resistance, or more > >> correctly very low loss resistance. > >> > >> It sounds like the connector you have is not contacting all the shields. > >> This is typical for mismatched connectors and cable, or improperly > >> manufactured cables. It could be somewhere else also, but I've seen this > >> before with quad shield. That's why I avoid it. > >> > >> > >> The problem seems to vary with the same > >>> connector and different PL-259 to F adapters, which makes me wonder what > >>> might be happening inside the adapters, but I can't imagine anything > >>> producing this result. I have also been unsuccessful in detecting a > > short > >>> using a simple DC multimeter. > >>> > >> Remember how RF current flows. It flows on the outside of cables, unless > > it > >> has a connection path to the inner shield. If you have cable with Mylar on > >> the inside of one or more shield layers, and a connector that only > > contacts > >> the outside of the outer shield, the inner shields that carry nearly all > > of > >> the desired transmission line currents will be insulated and isolated from > >> the shield at the connector. Every shield has to be contacted at the > >> connector, or at least the inner shield does. > >> > >> This might not be it, but it is a common issue with quad shield. Dual > > shield > >> is much more forgiving of connectors. You'll never detect the leakage in > >> dual shield in outside runs. If you have nasty common mode problems, a > >> thicker shield will help. It is also just as simple to add a few dozen or > >> few hundred ohms of common mode choking to regular dual shield cables and > >> knock down CM ingress to levels that cannot be noticed. > >> > >>> I;'m wondering if I should go through my RX antennas and replace all the > > F > >>> connectors and particularly the F to 259 adapters with something else, > > but > >>> what? BNCs? > >> BNC's are worse yet, as a general rule. They rely on spring pressure for > > the > >> shield path. Look into a type match error between the cable you have and > > the > >> connectors, or a connector installation error. > >> > >> 73 Tom > >> > >> All good topband ops know fine whiskey is a daylight beverage. > >> _________________ > >> Topband Reflector > > All good topband ops know fine whiskey is a daylight beverage. > > _________________ > > Topband Reflector > > > > All good topband ops know fine whiskey is a daylight beverage. > _________________ > Topband Reflector All good topband ops know fine whiskey is a daylight beverage. _________________ Topband Reflector
