Topband: DSL knocks out when on TopBand
> My problem is that when I try to operate on 160 the DSL > crashes. I have tried many Type 31 3 inch ferrite rings > with 20 turns on both the phone line and the Cat 5 cable > from the Zhone modem but even at 200 watts the > DSL looses sync. Herb, The problem usually comes from the wall wart with RF getting into the power supply lead. Most modems us an external PS such as the infamous wall wart. Try wrapping the PS lead around the ferrite core as close to the modem as possible, the same with the Telco wiring . The other alternative is to get a modem with a internal PS. De W8VVG ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: DSL knocks out when on TopBand
Herb (& others) — I struggled to keep my 160- and 80-meter RF out of my DSL equipment for a number of years. Multiple turns of all cables in/out of the DSL modem (Siemens Speedstream) on #31ferrites, etc. The best progress occurred when I wrapped the modem in common kitchen aluminum foil and very carefully attached a ground wire to the foil. (Use very big flat washers on both sides of the foil!) But I still experienced occasional disconnects. This past year my telco started supplying Westell Model 7500 DSL modems to new customers and my favorite telco tech saw that I got one, too. I haven't observed a single DSL outage since then. And I haven't even wrapped it in aluminum foil! Other things that will help: * If you can do it, relocate your incoming telephone line and/or your 160-meter antenna (and its radial field) for greater separation of the two or for altered orientation between the two. * Get your 160 (and perhaps 80) antenna farther from both the outdoor telco line and the indoor telco lines (i.e., your house). Bud, W2RU On Jul 16, 2012, at 9:34 PM, KL7RA wrote: > I solved this exact problem by blowing up the DSL modem on 160 and > ACS came out with a new one they said was more RFI proof and it was. > Westell is on the factory logo. ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: DSL knocks out when on TopBand
On 7/16/2012 6:10 PM, N1BUG wrote: > I had exactly the same problem, tried the same "cures" you have. The > problem is ADSL uses frequencies up to 1.1 MHz. The modems are > easily overloaded by 1.8 MHz RF. Nothing worked until I built this > simple filter designed by OZ1CTK: Looks great, Paul. Thanks for posting this. This is a differential mode filter, so it suggests that some or all of the telco cable feeding the modem isn't twisted pair, or isn't very good twisted pair. SO -- another solution could be replacing that poor cable with CAT5, using the pair within the CAT5 that has the highest twist ratio. Shielding is NOT important, but TWISTING is. Un-twisted cable is notoriously bad for RF rejection. KL7RA's advice is also quite good -- the problem is poor rejection of the 160M signal by the DSL modem and/or its wiring, and we should lean on our service providers to fix that, either with new hardware/wiring, or filters, or both. 73, Jim K9YC ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: DSL knocks out when on TopBand
>Please let me know. Hi Herb Thanks for the dozens of Q's on top. I solved this exact problem by blowing up the DSL modem on 160 and ACS came out with a new one they said was more RFI proof and it was. Westell is on the factory logo. Other changes were the telco wire going inside the walls length was changed from about 60 feet to 10 feet when I moved the DSL modem to a new position in the basement. I used shielded wire from the phone jack to the service telco box but only because I had 10 feet of that style cable. Any one of which or all of them fixed the problem. My money is on the new DSL modem box which they said was more RFI proof. Almost all of my RFI problems this past 50 years was solved when I bought new equipment or a new device. Or moved. 73 Rich KL7RA - Original Message - From: "Herb Schoenbohm" To: "TopBand List" Sent: Monday, July 16, 2012 4:57 PM Subject: Topband: DSL knocks out when on TopBand > Fortunately I have a Wi-Max service that is immune from RFI but I > frequently use a DSL service for remote control with guest ops during > contests. The DSL is more reliable in so much is I get 1.5 Mbps up and > down all the time and every time. (The Wi-Max at times gives me CW > hick-ups and although it works with Icom's RS-BA1 remote this does not > compare with reliability and flawless remote paddle CW using Remote Rig > and a Kenwood TS-2000. Remote ops prefer being able to have a real rig > head in front of them and use a local paddle as well.) > > My problem is that when I try to operate on 160 the DSL crashes. I have > tried many Type 31 3 inch ferrite rings with 20 turns on both the phone > line and the Cat 5 cable from the Zhone modem but even at 200 watts the > DSL looses sync. I even have disconnected all phones and faxes but to > no avail. I'm sure this problem has been around this site for some time > but I would like any information on what i should try. My telephone > line enters the shack about 70 feet from a cage fed 85 foot tower and > the nearby 80 meter 1/4 wave vertical does not cause problems, only the > 160 meter antenna, and with relatively low power. > I don't hear any audible IX on the telephone while transmitting which > leads me to believe my problem is not a simple one to solve. Any > suggestions on what to try like using CAt 5 cable to the pole instead > of normal drop wire, RF Chokes, K-Y or K-Com filters, what works best > with a DSL with 160 meter IX problems. Please let me know. > > Thanks, > > > Herb Schoenbohm, KV4FZ > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: DSL knocks out when on TopBand
> My problem is that when I try to operate on 160 the DSL > crashes. I have tried many Type 31 3 inch ferrite rings > with 20 turns on both the phone line and the Cat 5 cable > from the Zhone modem but even at 200 watts the > DSL looses sync. Herb, I had exactly the same problem, tried the same "cures" you have. The problem is ADSL uses frequencies up to 1.1 MHz. The modems are easily overloaded by 1.8 MHz RF. Nothing worked until I built this simple filter designed by OZ1CTK: http://www.ddxg.dk/oz7c/adsl/adsl_160m_filter.pdf Without this filter 50 watts on 160 kills my DSL connection. With the filter, 1500 watts is OK 99.9% of the time. Very rarely in wet or very windy weather I still have problems, for what reason I don't know. 73, Paul N1BUG ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: DSL knocks out when on TopBand
Fortunately I have a Wi-Max service that is immune from RFI but I frequently use a DSL service for remote control with guest ops during contests. The DSL is more reliable in so much is I get 1.5 Mbps up and down all the time and every time. (The Wi-Max at times gives me CW hick-ups and although it works with Icom's RS-BA1 remote this does not compare with reliability and flawless remote paddle CW using Remote Rig and a Kenwood TS-2000. Remote ops prefer being able to have a real rig head in front of them and use a local paddle as well.) My problem is that when I try to operate on 160 the DSL crashes. I have tried many Type 31 3 inch ferrite rings with 20 turns on both the phone line and the Cat 5 cable from the Zhone modem but even at 200 watts the DSL looses sync. I even have disconnected all phones and faxes but to no avail. I'm sure this problem has been around this site for some time but I would like any information on what i should try. My telephone line enters the shack about 70 feet from a cage fed 85 foot tower and the nearby 80 meter 1/4 wave vertical does not cause problems, only the 160 meter antenna, and with relatively low power. I don't hear any audible IX on the telephone while transmitting which leads me to believe my problem is not a simple one to solve. Any suggestions on what to try like using CAt 5 cable to the pole instead of normal drop wire, RF Chokes, K-Y or K-Com filters, what works best with a DSL with 160 meter IX problems. Please let me know. Thanks, Herb Schoenbohm, KV4FZ ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
