AM 860 The Answer

This topic contains 24 replies, has 10 voices, and was last updated by  semoochie 1 week, 1 day ago.

Viewing 10 posts - 16 through 25 (of 25 total)
  • Author
    Posts
  • #36781

    Andy Brown
    Participant

    860 is licensed to Troutdale, OR. 1550 is licensed to Vancouver. That dogleg in the 860 pattern was needed to put city grade into Troutdale, achieved with the tower at the top left and the leftmost of the three in line towers which put better signal over Vancouver and parts of Portland.

    The main nulls at 335º and 170º make north and south coverage dicey no matter where you put the antenna site.

    https://transition.fcc.gov/Bureaus/MB/Databases/AM_DA_patterns/1646990-124898.pdf

    #36782

    Broadway
    Participant

    Diplex off of KXTG with main lobe going west from their east PDX site with north dogleg to Troutdale…know their close to each other on the dial but have been seeing some close dial position diplexes out there these days…and would take a few bucks to perform.

    #36785

    Andy Brown
    Participant

    I don’t think so. I’m guesstimating that at night, it couldn’t get city grade signal over Troutdale because of protection requirements to the NE.

    http://bit.ly/2IlweoE

    The third null is at ~45º (protects CBKF Saskatoon) and if you put the antenna at KXTG in Damascus it would prevent signal from going in the direction of Troutdale. Look at the linked pattern and visualize moving the center to where you suggest, it’s pretty clear that the null would point right at Troutdale.

    http://bit.ly/2IhE2HF

    #36794

    semoochie
    Participant

    Your second bit.ly link won’t load, Andy.

    #36811

    Andy Brown
    Participant

    Works fine here.

    #36812

    jr_tech
    Participant

    Works fine here as well, but for grins try this un-compressed version:

    http://nf8m.com/pattern_maps/2016/NIGHTTIME-UNLIMITED/NIGHTTIME-UNLIMITED_map_860KHz-1.html

    #36813

    Screamer
    Participant

    Wow. That’s pretty neat. Never seen a map like that before. How do you access it for other frequencies? Looks like fun to geek out on.

    #36814

    jr_tech
    Participant

    Sorry, I should have linked the home page as well:

    http://www.nf8m.com/patternmaps.html

    Select day or night and then choose a frequency. Indeed, good geek fun.

    #36815

    Screamer
    Participant

    Thank you!!

    #36823

    semoochie
    Participant

    I don’t know what was wrong. The first one worked fine but the second one gave me an error message. I tried it three times before posting. I just tried it again and it’s fine. I think it had something to do with Firefox. Thank you.

Viewing 10 posts - 16 through 25 (of 25 total)

You must be logged in to reply to this topic.