Channels in the 1100's don't work most of the time

Sounds like you might be in Phoenix, AZ.

Most every HD channel above 1100 is a SDV channel that requires a Tuning Adapter.
So are most every SD channel above 100

1130 Hallmark HD is NOT a SDV channel. So that makes sense.

Do you have a Cisco Tuning Adapter?  if not you need one.

If you do have a Tuning Adapter, you need to reboot it about every 30 days, and look at the Tuning Adapter Status Menu for the FDC and RDC levels, you may have a very weak signal.

Here is my Cisco Tuning Adapter troubleshooting help page, it's not just TiVo specific and has extensive info.
http://www.tivocommunity.com/tivo-vb/showthread.php?t=482537

Post how your Coax is distributed around the house and what splitters you are using and were located.

Posting the Signal levels from your Cable Modem and knowing your coax cabling could help diagnosis a signal issue.
Your Cable Modem Signals can be found here: http://192.168.100.1/

I am in AZ. I do have a tuning adapter. I didnt reboot it becuase when i first set it up it took many many hours to start working. I will reboot it now.

My 2 coax lines goes to a panel in my upstairs closet. 1 splits to my cable modem and phone modem. Both of them are in different rooms around the house. The other splits with a splitter in the panel and then runs to all the rooms for tv. The HD HomeRun is downstairs.

I found something that says FDC in the HDHomeRun page for the tuning adapter but couldnt find RDC

CURRENT FDC

Freq: 75.500 MHz

DAVIC: ?

Status: Locked

Level: -10 dBmV

Seconds: 9452

Corr Bytes: 95

Uncor Blks: 381

Errs Avg/Inst: 0 / 0

Total Bytes: 1669858810

S/N: 30 dB

CURRENT QAM

Freq: 687.000 MHz

Tuning Mode: QAM-256

Status: Locked

Level: -16 dBmV

I know my signals for my cable modem are not good but i get full speed 300+ mbs

1 Locked 256QAM 126 843.00 MHz -16.60 dBmV 32.96 dB 7993 20408

2 Locked 256QAM 121 813.00 MHz -14.70 dBmV 33.96 dB 95 0

3 Locked 256QAM 122 819.00 MHz -14.90 dBmV 33.83 dB 53 0

4 Locked 256QAM 123 825.00 MHz -15.50 dBmV 33.38 dB 110 0

5 Locked 256QAM 124 831.00 MHz -15.10 dBmV 33.96 dB 8330 21103

6 Locked 256QAM 125 837.00 MHz -15.70 dBmV 33.38 dB 124 0

7 Locked 256QAM 127 849.00 MHz -15.90 dBmV 33.49 dB 23751 13152

8 Locked 256QAM 128 855.00 MHz -15.90 dBmV 33.38 dB 312 0

9 Locked 256QAM 129 861.00 MHz -16.50 dBmV 32.68 dB 926 0

10 Locked 256QAM 130 867.00 MHz -17.00 dBmV 32.96 dB 443 0

11 Locked 256QAM 131 873.00 MHz -15.90 dBmV 33.49 dB 94 0

12 Locked 256QAM 132 879.00 MHz -16.20 dBmV 33.38 dB 835 0

13 Locked 256QAM 133 885.00 MHz -17.00 dBmV 32.68 dB 14568 0

14 Locked 256QAM 134 891.00 MHz -17.10 dBmV 32.68 dB 6458 0

15 Locked 256QAM 135 897.00 MHz -17.00 dBmV 32.68 dB 889 0

16 Locked 256QAM 136 903.00 MHz -17.50 dBmV 32.68 dB 297008 900038

17 Locked 256QAM 137 909.00 MHz -17.60 dBmV 32.32 dB 577325 876723

18 Locked 256QAM 138 915.00 MHz -17.10 dBmV 32.68 dB 185759 47949

19 Locked 256QAM 139 921.00 MHz -17.40 dBmV 32.32 dB 205350 0

20 Locked 256QAM 140 927.00 MHz -17.80 dBmV 31.99 dB 400848 0

21 Locked 256QAM 141 933.00 MHz -17.50 dBmV 32.24 dB 60946 2

22 Locked 256QAM 142 939.00 MHz -16.80 dBmV 32.32 dB 6005 3

23 Locked 256QAM 143 945.00 MHz -16.70 dBmV 32.58 dB 2179 22

24 Locked 256QAM 144 951.00 MHz -16.60 dBmV 32.68 dB 50490 21

Edit: well I fixed the text wall, had to use html paragraph tags

You posted the "RF Statistic" menu
DAVIC: ?  (This should say Connected)
Status: Locked
Level: -10 dBmV (this is OK but very borderline low)

CURRENT QAM Freq: 687.000 MHz
Tuning Mode: QAM-256 Status: Locked
Level: -16 dBmV (this is way too low, the minimum is -10 to -15)

The first top menu item should be "Status Summary"  go to the 2nd page

RF PARAMETERS
Tuner: (a frequency)
FDC: 75.000 MHz
RDC: 16.250 MHz
Tuner:  Needs to be greater than -10dBmV closer to zero or greater is best
FDC:  Needs to be greater than -10dBmV closer to zero or greater is best
RDC: Needs to be greater than 30dBmV but less than 50dBmV

For your Cable Modem, Cox considers anything less than -10dBmV for a DOCSIS 3.0 Modem to be out of spec,

you are seeing -17dBmV

You need either a Cox Tech to troubleshoot why your signals are so low, or you need a Signal Amp if your cable runs are over 250 - 300 feet. from the drop.

I just power cycled the tuning adapter, right now its still initializing but here is the info from that page>

Free: 8749312

Largest: 8749308

RF PARAMETERS

Tuner: 722.571 MHz

FDC: 75.500 MHz

RDC: 16.250 MHz

Tuner: Invalid

FDC: -10 dBmV

RDC: 57 dBmV

FDC: 0/Sec (avg)

RDC: 455 uSec

CLOCKS

Booted: Sun Feb 28 2016,

5:31:20 AM MST (0x56D2E898)

Current: Sun Feb 28 2016,

5:38:16 AM MST (0x56D2EA38)

actually its in ready mode now, here is the updated info

Free: 8749312

Largest: 8749308

RF PARAMETERS

Tuner: 687.000 MHz

FDC: 75.500 MHz

RDC: 16.250 MHz

Tuner: -15 dBmV

FDC: -11 dBmV

RDC: 57 dBmV

Tuner: 0/Sec (avg)

FDC: 0/Sec (avg)

RDC: 455 uSec

CLOCKS

Booted: Sun Feb 28 2016,

5:31:20 AM MST (0x56D2E898)

Current: Sun Feb 28 2016,

And channels in 1100 still don't work after the tuning adapter reboot, but like I said they have worked in the past just not very often.

bryaninphx said:

You need either a Cox Tech to troubleshoot why your signals are so low, or you need a Signal Amp if your cable runs are over 250 - 300 feet. from the drop.

The RDC: 57 dBmV is way too high.

RDC is Return Data Channel, this is you requesting the SDV channel.

The greater the Attenuation Loss (resistance) the higher the RDC Power Level, and anything over about 50dBmV is most likely not even getting back to Cox to tell it to turn on that channel.

Also, I imagine at Tuner Levels of -15dBmV, you are seeing some or quite a bit of macroblocking and signal break-ups.

bryaninphx said:

The RDC: 57 dBmV is way too high.

RDC is Return Data Channel, this is you requesting the SDV channel.

The greater the Attenuation Loss (resistance) the higher the RDC Power Level, and anything over about 50dBmV is most likely not even getting back to Cox to tell it to turn on that channel.

Also, I imagine at Tuner Levels of -15dBmV, you are seeing some or quite a bit of macroblocking and signal break-ups.

JasonS said:
Would the signal amp fix these issue or make them worse? I know it would help in incoming signal that is currently negative but would it also boost the return or lower it?

The proper Amp would help with the Return also.

I would not do it yourself unless you understand RF signals, it could be as simple as a bad splitter, or some bad connectors, or your coax runs are too long.

Here in Phoenix the RF levels will swing as far as 5dB to 7dB from winter to summer, hot temps are going to decrease your levels even more, so now is the time to get it fixed.

I installed this Amp for my mother, she was having the same issues, and did not want Cox to come out, but I also knew her Coax was all good, and I replaced all her connectors, the Amp eliminated the 4-Way splitter.

4 Port Cable TV/HDTV/Digital Amplifier Internet Modem Signal Booster Internet AMP

http://www.amazon.com/gp/product/B001EKCGT8

Thanks,they gave me one for free in the past but another tech removed it later. I guess i would need 2 since the internet and tv are different lines comming in. I emailed them to make an appointment hopefully it will be free for them to fix it...