Post RS errors, trial and error, which is the best way forward?

[mda99das]

I had posted my stats previously, and had loads of post RS errors.

I have a hub 5 which is fed by a 4 way amplifier. The incoming signal is by an RG6 cable given the distance, but the RF signal may be a tad too strong.

I had an engineer come out a while back and he fitted forward path attenuators on to all the boxes and the hub, and told me to keep an eye out, as it was literally trial and error. I tried it for a few days, and it made it worse, the picture on all 3 of the 360 boxes kept on pixelating. He fitted a 3dB attenuator on all 3 of the boxes and a 6 dB on the hub.

I took a screen grab of just the hub 5 having its 6dB resistor and got the following

Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID	Channel	Locked Status	RxMER (dB)	Pre RS Errors	Post RS Errors
1	306000000	3.7	37	QAM 256	22	1	Locked	37	814	41
2	138000000	5.7	36	QAM 256	1	2	Locked	36	3766	293
3	146000000	5.5	39	QAM 256	2	3	Locked	39	4709	569
4	154000000	5.3	38	QAM 256	3	4	Locked	38	4059	1458
5	162000000	5.1	38	QAM 256	4	5	Locked	38	2125	220
6	170000000	5	39	QAM 256	5	6	Locked	39	1636	437
7	178000000	5	38	QAM 256	6	7	Locked	38	1361	353
8	186000000	5	38	QAM 256	7	8	Locked	38	1796	1064
9	194000000	5	36	QAM 256	8	9	Locked	36	1029	202
10	202000000	4.9	39	QAM 256	9	10	Locked	39	923	79
11	210000000	5	38	QAM 256	10	11	Locked	38	1032	35
12	218000000	5	38	QAM 256	11	12	Locked	38	1257	64
13	226000000	4.9	38	QAM 256	12	13	Locked	38	1478	47
14	234000000	4.8	38	QAM 256	13	14	Locked	38	1401	22
15	242000000	4.7	39	QAM 256	14	15	Locked	39	1281	33
16	250000000	4.4	39	QAM 256	15	16	Locked	39	1302	32
17	258000000	4.1	38	QAM 256	16	17	Locked	38	1268	36
18	266000000	3.8	38	QAM 256	17	18	Locked	38	1203	39
19	274000000	3.4	39	QAM 256	18	19	Locked	39	1173	52
20	282000000	3.2	37	QAM 256	19	20	Locked	37	1206	38
21	290000000	3.4	37	QAM 256	20	21	Locked	37	1092	37
22	298000000	3.6	39	QAM 256	21	22	Locked	39	982	37
23	314000000	3.7	38	QAM 256	23	23	Locked	38	716	34
24	322000000	3.6	37	QAM 256	24	24	Locked	37	606	41
25	330000000	3.4	38	QAM 256	25	25	Locked	38	475	29
26	338000000	3.4	38	QAM 256	26	26	Locked	38	386	37
27	346000000	3.3	38	QAM 256	27	27	Locked	38	323	34
28	354000000	3.1	38	QAM 256	28	28	Locked	38	247	36
29	362000000	3	38	QAM 256	29	29	Locked	38	234	33
30	370000000	2.9	37	QAM 256	30	30	Locked	37	241	28
31	378000000	3	38	QAM 256	31	31	Locked	38	222	28

I then reset the hub, and placed a 3 dB attenuator on the cable before it hit the splitter, and then on the hub 5 I placed a 10 dB forward path attenuator. cont... next post down

[mda99das]

1	306000000	0.2	37	QAM 256	22
2	138000000	2.3	38	QAM 256	1
3	146000000	2.1	38	QAM 256	2
4	154000000	1.8	35	QAM 256	3
5	162000000	1.7	38	QAM 256	4
6	170000000	1.5	38	QAM 256	5
7	178000000	1.5	37	QAM 256	6
8	186000000	1.5	39	QAM 256	7
9	194000000	1.6	38	QAM 256	8
10	202000000	1.4	38	QAM 256	9
11	210000000	1.5	36	QAM 256	10
12	218000000	1.5	39	QAM 256	11
13	226000000	1.4	37	QAM 256	12
14	234000000	1.3	38	QAM 256	13
15	242000000	1.1	37	QAM 256	14
16	250000000	0.9	39	QAM 256	15
17	258000000	0.6	38	QAM 256	16
18	266000000	0.4	38	QAM 256	17
19	274000000	0.1	37	QAM 256	18
20	282000000	0.2	38	QAM 256	19
21	290000000	0.1	37	QAM 256	20
22	298000000	0.1	37	QAM 256	21
23	314000000	0.1	36	QAM 256	23
24	322000000	0.1	38	QAM 256	24
25	330000000	0.3	38	QAM 256	25
26	338000000	0.4	36	QAM 256	26
27	346000000	0.5	37	QAM 256	27
28	354000000	0.8	38	QAM 256	28
29	362000000	0.7	35	QAM 256	29
30	370000000	0.8	38	QAM 256	30
31	378000000	0.7	38	QAM 256	31

         

1		37	86	0
2		38	131	0
3		38	312	5
4		35	148	0
5		38	56	0
6		38	53	0
7		37	154	0
8		39	198	0
9		38	81	0
10		38	48	0
11		36	39	0
12		39	55	0
13		37	61	0
14		38	52	0
15		37	52	0
16		39	50	0
17		38	48	0
18		38	52	0
19		37	50	0
20		38	76	0
21		37	80	0
22		37	57	0
23		36	84	0
24		38	105	0
25		38	85	0
26		36	118	0
27		37	149	0
28		38	155	0
29		35	123	0
30		38	153	0
31		38	148	0

Much better . My signal levels are close to the zero mark and zero post RCS errors! The technician agreed with what I had done but I don't have his fancy tools. He changed one of the forward path attenuators .

[Megan_L · Accepted solution]

Hi Mda99das,

Thanks for coming back to us about your connection, we're thrilled to hear the tweaking you and the engineer did has now resolved the issue 🤗

Of course if you start to see a dip in the performance please come back to us!

Thanks,

Megan_L