Solved, obsolete. - Page 1
Forum section: electronics / rf-microwave

author: evb149
author_rank: Regular Contributor
timestamp: September 10, 2016, 04:52:56 am
content: Solved, obsolete.

author: jh15
author_rank: Frequent Contributor
timestamp: September 10, 2016, 05:19:15 am
content: I've been using a mythtv pvr since 2003 or so (before pvr term was coined I think). For convenience, we paid for basic cable for over the air at 6.00 a month or so.I use HDhomerun tuners.Recently, our cable changed around channels and PBS got lousy, asked wife of recent cable cost for off air channels, and it is 20+ dollars a month.Recently set up antennas in attic, several hdhomeruns, power from attic light, and a cat 5 cable to send 3 antennas to mythtv box.Keep post going, I'll help, get a lot out of eevblog myself.google mythtv to start.So antenna in good place, connect to hdhomerun boxes, then cat 5 to computer. No need for low loss ugly coax everywhere.Probably could be done with rasp pi and sdrs too, just reading into that, but think my problem has been solved.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 11, 2016, 02:52:41 am
content: I have a HD Homerun and although it works well, I don't use it much since there's just not very much good stuff on traditional TV nowadays. I mostly keep it around for special events like the Olympics.

author: Kappes Buur
author_rank: Regular Contributor
timestamp: September 11, 2016, 05:17:43 am
content: I'm using one of those GH antennae made with AWG10 solid copper for a couple of years now.Works quite well

author: jh15
author_rank: Frequent Contributor
timestamp: September 12, 2016, 03:38:29 am
content: evb149, keep looking into it. I only came down from the attic today a little late for Masterpiece Theater, which my wife thought was recording. Told her I'd be working on the system, and got PBS running ok, but she didn't know it was down. Usually she will watch on our still existing cable analog channels.I ran across *** cable techs at a supplier, and they tried to keep from smirking when saying they rearranged the qam frequencies, etc.We suddenly lost PBS, well not lost, but unwatchable pixelation, frequencies all changed, etc.They change at will with no notice to basic (just cable out of wall, analog and atsc off-air qam).They said I need an upgraded cable box now. Well, never had one using mythtv. Asked if they heard of HDhomerun, and they sort of nodded u huh.I got into myth with a few linux PCHDTV (brand) card and learned Linux quickly. Never got anything working well till HDhomerun. You just get rid of all antenna cable loss with a hdhome run at the antenna head end.At this time, I wish there was an equivalent hdhomerun FM-Radio box, as I'm struggling to keep a good signal through tons of coax for an EAS (conelrad) box at a community radio station.(I have freed up my quad coax cable to give them).Tomorrow, I'm going to compare the new dual input box with the old 2 input.I may even take it apaat to see if two physical antenna inputs after a splitter, etc.I also want independent antennas to independent tuners simultaneously. The new one messes this up.I bought old 2 input hdhrs on ebay after mine wen't flaky (could be cable co too). They run so hot, so will be checking caps on my old ones.enough for now, getting flaky myself.

author: jh15
author_rank: Frequent Contributor
timestamp: September 13, 2016, 04:05:25 am
content: Found today that the HDhomerun single antenna input box was just as sensitive as he dual tuner box of the past.But you cant put specialized antennas in it and program them independently like the last box.Yell at them please.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 15, 2016, 05:30:38 am
content: Quote from: jh15 on September 12, 2016, 03:38:29 amRTLSDR + Raspberry Pi

author: jh15
author_rank: Frequent Contributor
timestamp: September 15, 2016, 10:27:26 pm
content: I am looking into SDR for related projects, have a usb one somewhere.I would need to convert back to FM RF at the input to the EAS machine.Anyway, I have some plans for hanging new locations and bring the system from marginal to nominal with the existing quad coax.

author: MF-jockey
author_rank: Regular Contributor
timestamp: September 27, 2016, 10:50:13 am
content: Quote from: evb149 on September 11, 2016, 03:07:49 amThere is a bad solution of balun 300 to 75 Ohm. One coil is shorted by grounding each end.You can look here for a better solution:http://www.brats-qth.org/training/advanced/feed2.htm