Portland CBS, doesn't come in

[imo.eagan]

Is CBS channel in Portland only available with Cable?

 

[bigpinkdragon286]

If you're referring to the CBS affiliate KOIN which uses virtual channel 6 in the Portland metro area of Oregon, then the station is still available over the air, but switched from UHF channel 40 to UHF channel 25 on June 1, 2018.

Due to antenna design considerations, the station is currently and has been operating since the frequency transition, on a low power backup transmitter, lower down on their broadcast tower until they can transition to a newer antenna which is better suited to the new broadcast frequency, higher up on the tower, around the 17th, and are expecting to increase broadcast power by the end of September.

If you previously received KOIN programming over the air before June 1, 2018, it would have come in using the old frequency. You will want to perform a channel scan for your TV to pick up KOIN on it's new frequency. There is always the possibility that the station may not come in well enough while on it's backup transmitter, so if after a channel scan you can't receive the station, you should try again after the 17th and also after the first of October to see if the situation has improved.

Further information about KOIN 6

 

[imo.eagan]

Thanks so much for your response.Will check as you suggested... After 17th as scan didn't work...

 

[bigpinkdragon286]

Being that the backup antenna is both operating on lower power and lower down on their broadcast antenna, depending on your location, you may have ended up in a new, temporary RF shadow region until they get their higher antenna installed. Reorienting the antenna may help unless you're too far away from the transmitter, you may just not be getting enough signal.

You can always input your address into an interactive coverage map such as this one to see how your location fares in relation to the broadcast site if you're interested in a visual simulation of what the signal is doing in relation to the terrain. Clicking on a particular station beneath the map will give you a color map that shows approximate signal strength for the selected station.