[RFI] 4khz Spectrum comb ADSL2 one last try composed as text

[HankP]

If this does not work I give up - I apologize for this mess  -- Hank K7HP 


I have seen nothing on this reflector about carriers  every 4 khz from Centurylink ADSL2 systems . (or any other system)

Here is my short version of about 75 days with Clink.

A year ago Clink  finally reduced the carriers on 160 from almost S9 (-73 dBm)  out of noise to about my noise level (-100--105dBm) .Took an Engineer from Clink in Denver turning off customers from Denver while I watched the comb to absolutely identify the customer modem source.Then it  took over a month for him to even find someone in Phoenix to address the issue. Clink tech did everything under the sun except  address that customer - then two weeks later they sent out same tech along with another tech who was a Ham and had some idea of what a RF Carrier was. Again they addressed evertthing from the DSLAM to my house with no effect (EVEN though they knew the customer who had been identified by Denver) .

FInally I got them to walk the alley with me and my 160 portable DF rx. The Ham pulled out a MFJ VHF noise receiver and we walked the alley  They contended the problem was APS .. Nope ,its carriers guys , not noise.( I had P3 spectrum plots showing the carriers every 4 khz - did not mean anything to  them- and  after every change I woudl go back and run and print another plot )   I showed them (they could listen to the speaker on my Rx.) how loud the carriers got 100 feet or so either side of that identified customer.  The original tech left and  the Ham stayed with me . I took the ferrite rod/jfet source follower  DFing assy I have off the R10 rx and just put the little rubber ducky  whip on it and asked him to go probe in his access taps and see how loud the carriers were there . He did so and admitted .Yep its in our system.

The original tech came back and they identified numerous problems - among which was an open pair to that customer which was forcing that modem to run wide open (100 mw per carrier) . Interesting that the Clink Engineer told me tey had 3 other customers within about 400 feet who either had no VDSL or drastically reduced internet speeds. Anyhow they found a tap that had leaked and said everything was so corroded they were reluctant to do any work there and a crew would have to come ot and re do the whole thing . They did replace the customer drop with a new "improved bonded and shielded  pair " and were able to find a pair to replace the open. This got the carriers to just at my noise level - and they said since te customer was not at home - they would have to contact him to check it (I doubt they ever did as the carriers never changed - and virtually every half hour their  supervisor was calling asking why it was taking so long , this was costing Clink money- and they could not afford to be worrying about this stuff !!!!! )

Well about a year passed - here come a bunch of trucks and they ran a second cable - then about a month later  a guy comes and puts new access taps on the new cable , and a week or so later they moved some customers to the new taps -BUT left the old wires just hnaging - in fcat the hoiuse behind me they just took the junction box off the wall  , threw it over the fence into alley with wires to the old cable still in place !!!! iIts still hanging there )  Other places they just cut off the cable and left it hanging down in the breeze.

SOOOOO now I have carriers on 40 meters 7 to 15 dB out of my noise -100--105 dBM on 40) , on 160  5 to 7 dB out of my noise and about at noise on 80  . I actually see two carriers on 40 about 44 hz apart probably fromtwo different modems.

40M RX ant is M2 40M1L at 50 feet -- I can null the carriers down to noise off end (perpendicular to phone cable)

I have talked to W0IVJ , I have talked  with Mike Gruber of ARRL and both say they have not seen these carriers and I am the only one reporting them !!!!!!!!! 

Curious - anyone else seeing this stuff ?? Or am i just Lucky Pierre ?

Hank K7HP