Coaxial A/B Switch (1)
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- Coaxial A/B Switch
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75 ohm F type coaxial A-B switch. Switch between cable and antenna or other inputs. 75 dB isolation.
Top Customer Reviews
We are using this switch to switch between basic cable (the output of a 480i set-top box) and the cable signal directly from the wall (which provides clearQAM national channels, typically, if you have Comcast service).
Depending on your area and service provider, this can effectively give you the national channels (CBS, FOX, several PBS channels, NBC, and a few others) in high-definition without needing to pay for HDTV service since the service providers often send those unencrypted. We have a better quality splitter that splits the incoming signal between the cable box and this switch, effectively allowing us to "bypass" the low-definition cable box.
In all likelihood, the ~3dB (or more) of loss from splitting the cable signal to the box and this switch is a more serious issue than the loss of this switch itself. However, I have found that there are picture artifacts on some channels when using this switch versus just routing directly to the TV (and still including the splitter). Whether this is due to an impedance mismatch, this switch being intrinsically lossy, or just the fact that we are on the cusp of a usable signal already is not clear. You will, however, find that this switch feels pretty cheap in-hand.
For this to work without needing to rescan every time you use the switch, I think the TV itself needs to have a setting where you switch between antenna and cable. On the TV where this works without rescanning, with the remote we go into a settings menu and there is a Tuner Mode where you can switch between "cable" or "antenna." So when we want cable, we set both the coaxial switch and tuner mode to "cable". And when we want antenna we set both to "antenna".
On the TV were we need to rescan each time we use the switch, the TV itself does not have a a tuner mode setting. When we switch the coaxial switch we either get snow or "no signal" until we rescan all the channels.