Re: [Flexradio] [FlexEdge] Suggestions
On Mon, Dec 24, 2012 at 8:22 AM, Gerald Capodieci wrote: > Stray RF in the shack can damage other equipment such as wireless > Internet routers. It may be unhealthy to the operator and be the > source of RFI to neighbors. > Here are some ways to stop Stray RF. > 1. Use only balanced antenna with less than 1.5:1 SWR. > At the risk of offending, this is an old wives tale. SWR has nothing to do with SWR in the shack and what Tim said, RF on the outside of the coax has EVERYTHING to do with RF in the shack. RF current on the outside of the coax can come from two places. It can be conducted from the antenna or it can be picked up from being in the near-field. A current/common-mode choke at the feed point of the antenna will stop the former and current/common-mode chokes at the entry to the building and again just before the equipment in the shack will take care of near-field pick-up. > 2. If you have to use an antenna tuner use ladder line. > Note: Even if the tuner reads a 1:1 match to the radio, the SWR and > thus the reflected power could be very high between the tuner and the > antenna. The reflected power can radiated in many undesirable > directions or just become heat in the tuner, feed line and any loading > coils in the antenna. > Well, if the balanced line is truly balanced, the fields from the equal-but-opposite currents in the conductors will cancel out, eliminating radiation and/or pick-up. But that still won't deal with common mode currents and you still need the common-mode choke. It is just that building a common mode choke for balanced line is MUCH more difficult than building one for coax. In that case it is easier you put the common mode choke between the tuner and the rest of the station. BTW, you can also use a current choke/common-mode choke to turn an unbalanced tuner into a balanced tuner. That is how I get my SGC-239 to tune my loop without sending RF back down the outside of the coax to the shack. -- Brian Lloyd, WB6RQN/J79BPL 3191 Western Dr. Cameron Park, CA 95682 br...@lloyd.com +1.767.617.1365 (Dominica) +1.916.877.5067 (USA) ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
Tim, I HAVE a granite firewire cable. As expensive as it was, it was one of the first things I bought to fight the RF ingress battle. I have snap on Ferrites on all of my leads on my computer and power supply for the Flex and it is grounded. After Christmas, I will be investing in some more RF ingress solutions. 73, Robert KB6QXM "Ham Radio Open Conversation" Yahoo group owner/moderator - Reply message - From: "Tim Ellison" To: Subject: [Flexradio] [FlexEdge] Suggestions Date: Mon, Dec 24, 2012 8:05 am That behavior is indicative of RF on the Firewire cable. There is too much stray RFin the shack and it is taking a path to ground through your computer to the AC safety ground via the Firewire cable. Ground your PC and radio together with a low impedance ground strap and either (a) put more ferrite beads on the Firewire cable or (b) get a Granite Digital Firewire cable. These suggestion (other than grounding the PC and the radio together) are Band-Aids to treat the RFI symptom not the cause. Getting the RF out of the shack (common mode currents on the coax) is fixing the root cause. This was just discussed in the thread "Equipment grounding, static discharge and such..." Tim Ellison On 12/24/2012 10:12 AM, Robert Costa, KB6QXM wrote: > Mike, > > I am using a Yeasu md-1c8. It is connected to the front panel. I thought that > my issues were on wavelengths of 20 meters and above, but I was on 40 last > night and the ham I was talking to said that I had motorboating in my audio. > > Ok...so now I have a 1 band SDR > > Thank you for all of your suggestions. I will follow the suggestions and may > just use my old analog radio until I get all of these issues with the Flex > worked out. > > Happy Holidays all. > > 73, > Robert > KB6QXM > "Ham Radio Open Conversation" > Yahoo group owner/moderator > > > - Reply message - > From: "Mike va3mw" > To: "Dave Gomberg" > Cc: "Robert Costa" , "Flex Radio List" > , "Flexedge" > Subject: [FlexEdge] Suggestions > Date: Mon, Dec 24, 2012 4:05 am > > > What mic are you using? > > Mike va3mw > > > > On Dec 23, 2012, at 11:48 PM, Dave Gomberg wrote: > >> At 14:15 12/22/2012, Robert Costa wrote: >>> who has used what and what the results and over all costs have been. >> I put ferrites on all cables, but what really fixed my RF ingress problem >> was the mic >> input to the RJ45, I ferrited the dickens out of the audio in leads and >> problem solved. >> I did that by wrapping a 2 foot RJ45 cable thru a toroid about a dozen times. >> >> >> >> -- >> Dave Gomberg, San Francisco NE5EE Programming since 1961 >> All addresses, phones, etc. at http://www.wcf.com/ham/info.html >> - >> >> ___ >> Flexedge mailing list >> flexe...@flex-radio.biz >> http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz >> This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used >> for posting topics related to SDR software innovation and other technical >> SDR topics. > ___ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
Stray RF in the shack can damage other equipment such as wireless Internet routers. It may be unhealthy to the operator and be the source of RFI to neighbors. Here are some ways to stop Stray RF. 1. Use only balanced antenna with less than 1.5:1 SWR. 2. If you have to use an antenna tuner use ladder line. Note: Even if the tuner reads a 1:1 match to the radio, the SWR and thus the reflected power could be very high between the tuner and the antenna. The reflected power can radiated in many undesirable directions or just become heat in the tuner, feed line and any loading coils in the antenna. On Mon, Dec 24, 2012 at 8:05 AM, Tim Ellison wrote: > RFin the shack ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
That behavior is indicative of RF on the Firewire cable. There is too much stray RFin the shack and it is taking a path to ground through your computer to the AC safety ground via the Firewire cable. Ground your PC and radio together with a low impedance ground strap and either (a) put more ferrite beads on the Firewire cable or (b) get a Granite Digital Firewire cable. These suggestion (other than grounding the PC and the radio together) are Band-Aids to treat the RFI symptom not the cause. Getting the RF out of the shack (common mode currents on the coax) is fixing the root cause. This was just discussed in the thread "Equipment grounding, static discharge and such..." Tim Ellison On 12/24/2012 10:12 AM, Robert Costa, KB6QXM wrote: Mike, I am using a Yeasu md-1c8. It is connected to the front panel. I thought that my issues were on wavelengths of 20 meters and above, but I was on 40 last night and the ham I was talking to said that I had motorboating in my audio. Ok...so now I have a 1 band SDR Thank you for all of your suggestions. I will follow the suggestions and may just use my old analog radio until I get all of these issues with the Flex worked out. Happy Holidays all. 73, Robert KB6QXM "Ham Radio Open Conversation" Yahoo group owner/moderator - Reply message - From: "Mike va3mw" To: "Dave Gomberg" Cc: "Robert Costa" , "Flex Radio List" , "Flexedge" Subject: [FlexEdge] Suggestions Date: Mon, Dec 24, 2012 4:05 am What mic are you using? Mike va3mw On Dec 23, 2012, at 11:48 PM, Dave Gomberg wrote: At 14:15 12/22/2012, Robert Costa wrote: who has used what and what the results and over all costs have been. I put ferrites on all cables, but what really fixed my RF ingress problem was the mic input to the RJ45, I ferrited the dickens out of the audio in leads and problem solved. I did that by wrapping a 2 foot RJ45 cable thru a toroid about a dozen times. -- Dave Gomberg, San Francisco NE5EE Programming since 1961 All addresses, phones, etc. at http://www.wcf.com/ham/info.html - ___ Flexedge mailing list flexe...@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
Mike, I am using a Yeasu md-1c8. It is connected to the front panel. I thought that my issues were on wavelengths of 20 meters and above, but I was on 40 last night and the ham I was talking to said that I had motorboating in my audio. Ok...so now I have a 1 band SDR Thank you for all of your suggestions. I will follow the suggestions and may just use my old analog radio until I get all of these issues with the Flex worked out. Happy Holidays all. 73, Robert KB6QXM "Ham Radio Open Conversation" Yahoo group owner/moderator - Reply message - From: "Mike va3mw" To: "Dave Gomberg" Cc: "Robert Costa" , "Flex Radio List" , "Flexedge" Subject: [FlexEdge] Suggestions Date: Mon, Dec 24, 2012 4:05 am What mic are you using? Mike va3mw On Dec 23, 2012, at 11:48 PM, Dave Gomberg wrote: > At 14:15 12/22/2012, Robert Costa wrote: >> who has used what and what the results and over all costs have been. > > I put ferrites on all cables, but what really fixed my RF ingress problem was > the mic > input to the RJ45, I ferrited the dickens out of the audio in leads and > problem solved. > I did that by wrapping a 2 foot RJ45 cable thru a toroid about a dozen times. > > > > -- > Dave Gomberg, San Francisco NE5EE Programming since 1961 > All addresses, phones, etc. at http://www.wcf.com/ham/info.html > - > > ___ > Flexedge mailing list > flexe...@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used > for posting topics related to SDR software innovation and other technical SDR > topics. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
What mic are you using? Mike va3mw On Dec 23, 2012, at 11:48 PM, Dave Gomberg wrote: > At 14:15 12/22/2012, Robert Costa wrote: >> who has used what and what the results and over all costs have been. > > I put ferrites on all cables, but what really fixed my RF ingress problem was > the mic > input to the RJ45, I ferrited the dickens out of the audio in leads and > problem solved. > I did that by wrapping a 2 foot RJ45 cable thru a toroid about a dozen times. > > > > -- > Dave Gomberg, San Francisco NE5EE Programming since 1961 > All addresses, phones, etc. at http://www.wcf.com/ham/info.html > - > > ___ > Flexedge mailing list > flexe...@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used > for posting topics related to SDR software innovation and other technical SDR > topics. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
At 14:15 12/22/2012, Robert Costa wrote: who has used what and what the results and over all costs have been. I put ferrites on all cables, but what really fixed my RF ingress problem was the mic input to the RJ45, I ferrited the dickens out of the audio in leads and problem solved. I did that by wrapping a 2 foot RJ45 cable thru a toroid about a dozen times. -- Dave Gomberg, San Francisco NE5EE Programming since 1961 All addresses, phones, etc. at http://www.wcf.com/ham/info.html - ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
I had similar issues, and addressed them through a combination of feedline chokes and microphone input filtration. I found that the mic input seemed to by my biggest "entry point". I spoke to a number of people that couldn't use "pro" condenser mics for this reason. I reduced the mic input problem through chokes, grounding and attention to potential "pin 1" problems. I do have to say that my 5K was the most RFI-sensitive modern transceiver I ever used. Good luck, Mike - N8MSA Robert Costa wrote: >All, > >As you may have seen from previous posts, that I have RF ingress issues on my >Flex 5000a restricting my use of the flex to 40 meters and below. As I want to >start addressing these issues, I would like to know what products others have >used. > >I need to eliminate common mode currents at the feedpoint of my 80-10 meter >dipole. I have seen Radio Works line isolators, but have been told that they >are not very effective. I have been told to use a W2DU current UNUN from a >company like the wireman. > >I am open to suggestions as I do not want this to be an extended engineering >science fair. > >As this RF ingress issue has been a complete irritating experience with my >Flex, I would like to hear who has used what and what the results and over all >costs have been. > >Thank you, > >Robert >KB6QXM >___ >Flexedge mailing list >flexe...@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz >This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used >for posting topics related to SDR software innovation and other technical SDR >topics. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & Ferrites
I have owned the Sdr 1000, two flex 3000's and the flex 5000 absolutely no RFI running a alpha 8410 and several solid state kw amps and tentec 425 amp. Inverted vs on 75,40,20,18,10 and log periodic . I have computer and all items grounded at one spot to earth ground which was checked with a meger. I did have some issues with the DDR 1000's ,I had one of all three production runs. But they were with the cables staying pluged in the back. All in all I have been extremely happy with the lack of RFI. From what I have heard on here the people who have had a lot of trouble also with regular radios. Sent from my iPad On Dec 22, 2012, at 6:42 PM, "Dr. William J. Schmidt, II" wrote: > I had a 3000 and a 5000 and the only way I could get the RF out of the 3000 > was to sell it... > > > Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ > > Owner - Operator > Big Signal Ranch > Staunton, Illinois > > email: b...@wjschmidt.com > > -Original Message- > From: FlexRadio [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of > Robert Costa > Sent: Saturday, December 22, 2012 5:54 PM > To: Lloyd Berg - N9LB; Flex Radio List; Flexedge > Subject: Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & > Ferrites > > Lloyd, > > I have a granite firewire cable. I have ferrites on everything elsee. Power > supply and all other cables. I was asking about what products people using > to eliminate the common mode currents of my coax. As I am actively working > on getting this fixed, I hope to see if there was someone that had the same > problem as I have and what they did to resolve it. I do not want to reinvent > the wheel or have some long and drawn out science fair. > > I may also have to rewire my microphone, I would like to have all of this > work completed soon. > > Then onto troubleshooting and fixing my Butternut HF9V. Right now I will > just stick to fixing the common mode currents on my dipole. That has been a > experience trying to dial the Butternut antenna in also. > > One challenge at a time. > > 73 > Robert > KB6QXM > > > ________ > From: Lloyd Berg - N9LB > To: Flex Radio List ; Flexedge > > Sent: Saturday, December 22, 2012 3:14 PM > Subject: Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & > Ferrites > > I had this problem when I first purchased my 5000A running more than about > 50 watts. It turned out that RF was getting into the firewire cable. > > I put ferrite chokes on each end of the firewire cable (three loops through > the hole), no more problems, now I can even run the Alpha amp at full power > 160m to 6m! I also put one on the microphone cable just for extra > insurance. Cost about $5 each. > > The ferrite chokes I used are: > > EMI/RFI Suppressors & Ferrites 257 OHM @100MHZ SPLIT FERRITE Mouser Part #: > 807-BF2930 Manufacturer Part #: BF2930 > > http://www.mouser.com, search on: BF2930 > > Unfortunately this number is now obsolete so you will have to look for the > current version of the same thing. > http://www.mouser.com/Passive-Components/EMI-RFI-Components/EMI-RFI-Suppress > ors-Ferrites/ > > You might even be able salvage the RF chokes that come attached to some > computer cables at no cost. > > 73 > > Lloyd - N9LB > > > -Original Message- > From: Flexedge [mailto:flexedge-boun...@flex-radio.biz]On Behalf Of Robert > Costa > Sent: Saturday, December 22, 2012 4:15 PM > To: Flex Radio List; Flexedge > Subject: [FlexEdge] Suggestions > > > All, > > As you may have seen from previous posts, that I have RF ingress issues on > my Flex 5000a restricting my use of the flex to 40 meters and below. As I > want to start addressing these issues, I would like to know what products > others have used. > > I need to eliminate common mode currents at the feedpoint of my 80-10 meter > dipole. I have seen Radio Works line isolators, but have been told that they > are not very effective. I have been told to use a W2DU current UNUN from a > company like the wireman. > > I am open to suggestions as I do not want this to be an extended engineering > science fair. > > As this RF ingress issue has been a complete irritating experience with my > Flex, I would like to hear who has used what and what the results and over > all costs have been. > > Thank you, > > Robert > KB6QXM > ___ > Flexedge mailing list > flexe...@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. I
Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & Ferrites
I had a 3000 and a 5000 and the only way I could get the RF out of the 3000 was to sell it... Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ Owner - Operator Big Signal Ranch Staunton, Illinois email: b...@wjschmidt.com -Original Message- From: FlexRadio [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Robert Costa Sent: Saturday, December 22, 2012 5:54 PM To: Lloyd Berg - N9LB; Flex Radio List; Flexedge Subject: Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & Ferrites Lloyd, I have a granite firewire cable. I have ferrites on everything elsee. Power supply and all other cables. I was asking about what products people using to eliminate the common mode currents of my coax. As I am actively working on getting this fixed, I hope to see if there was someone that had the same problem as I have and what they did to resolve it. I do not want to reinvent the wheel or have some long and drawn out science fair. I may also have to rewire my microphone, I would like to have all of this work completed soon. Then onto troubleshooting and fixing my Butternut HF9V. Right now I will just stick to fixing the common mode currents on my dipole. That has been a experience trying to dial the Butternut antenna in also. One challenge at a time. 73 Robert KB6QXM From: Lloyd Berg - N9LB To: Flex Radio List ; Flexedge Sent: Saturday, December 22, 2012 3:14 PM Subject: Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & Ferrites I had this problem when I first purchased my 5000A running more than about 50 watts. It turned out that RF was getting into the firewire cable. I put ferrite chokes on each end of the firewire cable (three loops through the hole), no more problems, now I can even run the Alpha amp at full power 160m to 6m! I also put one on the microphone cable just for extra insurance. Cost about $5 each. The ferrite chokes I used are: EMI/RFI Suppressors & Ferrites 257 OHM @100MHZ SPLIT FERRITE Mouser Part #: 807-BF2930 Manufacturer Part #: BF2930 http://www.mouser.com, search on: BF2930 Unfortunately this number is now obsolete so you will have to look for the current version of the same thing. http://www.mouser.com/Passive-Components/EMI-RFI-Components/EMI-RFI-Suppress ors-Ferrites/ You might even be able salvage the RF chokes that come attached to some computer cables at no cost. 73 Lloyd - N9LB -Original Message- From: Flexedge [mailto:flexedge-boun...@flex-radio.biz]On Behalf Of Robert Costa Sent: Saturday, December 22, 2012 4:15 PM To: Flex Radio List; Flexedge Subject: [FlexEdge] Suggestions All, As you may have seen from previous posts, that I have RF ingress issues on my Flex 5000a restricting my use of the flex to 40 meters and below. As I want to start addressing these issues, I would like to know what products others have used. I need to eliminate common mode currents at the feedpoint of my 80-10 meter dipole. I have seen Radio Works line isolators, but have been told that they are not very effective. I have been told to use a W2DU current UNUN from a company like the wireman. I am open to suggestions as I do not want this to be an extended engineering science fair. As this RF ingress issue has been a complete irritating experience with my Flex, I would like to hear who has used what and what the results and over all costs have been. Thank you, Robert KB6QXM ___ Flexedge mailing list flexe...@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & Ferrites
On Sat, Dec 22, 2012 at 3:53 PM, Robert Costa wrote: > Lloyd, > > I have a granite firewire cable. I have ferrites on everything elsee. > Power supply and all other cables. I was asking about what products people > using to eliminate the common mode currents of my coax. As I am actively > working on getting this fixed, I hope to see if there was someone that had > the same problem as I have and what they did to resolve it. I do not want > to reinvent the wheel or have some long and drawn out science fair. > Did you read the article that Tim pointed you to? That is an excellent article. If you want to purchase a good common-mode choke the one from DX Engineering is pretty good. Model FCC050-H05-A. See: http://www.dxengineering.com/search/product-line/dx-engineering-maxi-core-feedline-current-chokes Of course, you can make your own. They are quite easy. You are just coiling coax through the appropriate ferrite cores. Here is the basic flow for an antenna system done right: ANT---[cc]===[cc]-[LA]+=[cc]-rig | ground [cc] = current choke [LA] = lightning arrester -- Brian Lloyd, WB6RQN/J79BPL 3191 Western Dr. Cameron Park, CA 95682 br...@lloyd.com +1.767.617.1365 (Dominica) +1.916.877.5067 (USA) ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & Ferrites
Lloyd, I have a granite firewire cable. I have ferrites on everything elsee. Power supply and all other cables. I was asking about what products people using to eliminate the common mode currents of my coax. As I am actively working on getting this fixed, I hope to see if there was someone that had the same problem as I have and what they did to resolve it. I do not want to reinvent the wheel or have some long and drawn out science fair. I may also have to rewire my microphone, I would like to have all of this work completed soon. Then onto troubleshooting and fixing my Butternut HF9V. Right now I will just stick to fixing the common mode currents on my dipole. That has been a experience trying to dial the Butternut antenna in also. One challenge at a time. 73 Robert KB6QXM From: Lloyd Berg - N9LB To: Flex Radio List ; Flexedge Sent: Saturday, December 22, 2012 3:14 PM Subject: Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & Ferrites I had this problem when I first purchased my 5000A running more than about 50 watts. It turned out that RF was getting into the firewire cable. I put ferrite chokes on each end of the firewire cable (three loops through the hole), no more problems, now I can even run the Alpha amp at full power 160m to 6m! I also put one on the microphone cable just for extra insurance. Cost about $5 each. The ferrite chokes I used are: EMI/RFI Suppressors & Ferrites 257 OHM @100MHZ SPLIT FERRITE Mouser Part #: 807-BF2930 Manufacturer Part #: BF2930 http://www.mouser.com, search on: BF2930 Unfortunately this number is now obsolete so you will have to look for the current version of the same thing. http://www.mouser.com/Passive-Components/EMI-RFI-Components/EMI-RFI-Suppress ors-Ferrites/ You might even be able salvage the RF chokes that come attached to some computer cables at no cost. 73 Lloyd - N9LB -Original Message- From: Flexedge [mailto:flexedge-boun...@flex-radio.biz]On Behalf Of Robert Costa Sent: Saturday, December 22, 2012 4:15 PM To: Flex Radio List; Flexedge Subject: [FlexEdge] Suggestions All, As you may have seen from previous posts, that I have RF ingress issues on my Flex 5000a restricting my use of the flex to 40 meters and below. As I want to start addressing these issues, I would like to know what products others have used. I need to eliminate common mode currents at the feedpoint of my 80-10 meter dipole. I have seen Radio Works line isolators, but have been told that they are not very effective. I have been told to use a W2DU current UNUN from a company like the wireman. I am open to suggestions as I do not want this to be an extended engineering science fair. As this RF ingress issue has been a complete irritating experience with my Flex, I would like to hear who has used what and what the results and over all costs have been. Thank you, Robert KB6QXM ___ Flexedge mailing list flexe...@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions - EMI/RFI Suppressors & Ferrites
I had this problem when I first purchased my 5000A running more than about 50 watts. It turned out that RF was getting into the firewire cable. I put ferrite chokes on each end of the firewire cable (three loops through the hole), no more problems, now I can even run the Alpha amp at full power 160m to 6m! I also put one on the microphone cable just for extra insurance. Cost about $5 each. The ferrite chokes I used are: EMI/RFI Suppressors & Ferrites 257 OHM @100MHZ SPLIT FERRITE Mouser Part #: 807-BF2930 Manufacturer Part #: BF2930 http://www.mouser.com, search on: BF2930 Unfortunately this number is now obsolete so you will have to look for the current version of the same thing. http://www.mouser.com/Passive-Components/EMI-RFI-Components/EMI-RFI-Suppress ors-Ferrites/ You might even be able salvage the RF chokes that come attached to some computer cables at no cost. 73 Lloyd - N9LB -Original Message- From: Flexedge [mailto:flexedge-boun...@flex-radio.biz]On Behalf Of Robert Costa Sent: Saturday, December 22, 2012 4:15 PM To: Flex Radio List; Flexedge Subject: [FlexEdge] Suggestions All, As you may have seen from previous posts, that I have RF ingress issues on my Flex 5000a restricting my use of the flex to 40 meters and below. As I want to start addressing these issues, I would like to know what products others have used. I need to eliminate common mode currents at the feedpoint of my 80-10 meter dipole. I have seen Radio Works line isolators, but have been told that they are not very effective. I have been told to use a W2DU current UNUN from a company like the wireman. I am open to suggestions as I do not want this to be an extended engineering science fair. As this RF ingress issue has been a complete irritating experience with my Flex, I would like to hear who has used what and what the results and over all costs have been. Thank you, Robert KB6QXM ___ Flexedge mailing list flexe...@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
I had BAD issues on 17m and 75m, with my homemade OCF for 80 through 6m. I put an Ugly Balun directly under the 4:1 Balun of the OCF and then placed a Balun Designs 1:1 Max Choke where the feed line enters the house and my office. The model is a 1115du. Handles 5kw. Total cost? Less than 100$ and no more RF ingress. http://www.hamuniverse.com/balun.html http://www.balundesigns.com/servlet/the-63/balun-designs-1-cln-1-Isolation/Detail Regards -- Richard A Clafton | the brITish guy | W5\G7EIX RIROC - Hosting - Development - Technology http://www.riroc.com | rclaf...@riroc.com "Jack of all trades, master of none, though often better than the master of one." -Original Message- From: Flexedge [mailto:flexedge-boun...@flex-radio.biz] On Behalf Of Dan Parsons Sent: Saturday, December 22, 2012 4:26 PM To: Robert Costa Cc: Flexedge; Flex Radio List Subject: Re: [FlexEdge] Suggestions I had the exact same problem with my Flex 5000 setup and had great success with the T-4-500 line isolator from Radio Works. I'm using it with a Butternut HF9V vertical. Everyone's RF situation is different so I can't say for sure if it will fix your problem, but it made a night and day difference for me. Dan On Sat, Dec 22, 2012 at 2:15 PM, Robert Costa wrote: > All, > > As you may have seen from previous posts, that I have RF ingress issues on > my Flex 5000a restricting my use of the flex to 40 meters and below. As I > want to start addressing these issues, I would like to know what products > others have used. > > I need to eliminate common mode currents at the feedpoint of my 80-10 > meter dipole. I have seen Radio Works line isolators, but have been told > that they are not very effective. I have been told to use a W2DU current > UNUN from a company like the wireman. > > I am open to suggestions as I do not want this to be an extended > engineering science fair. > > As this RF ingress issue has been a complete irritating experience with my > Flex, I would like to hear who has used what and what the results and over > all costs have been. > > Thank you, > > Robert > KB6QXM > ___ > Flexedge mailing list > flexe...@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is > used for posting topics related to SDR software innovation and other > technical SDR topics. > ___ Flexedge mailing list flexe...@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
Much cheaper to add your own rf choke at the antenna feedpoint - buy a 4" diameter plastic pitcher from Wally World ($1.97), cut off the handle, drill 4 holes in the sides at each end, wrap the coax around the pitcher for about 20 to 25 turns, not critical, and secure the coax to the pitcher with ty wraps. This will eliminate the rf coming back down the coax shield. Had the same problem with my 5000 and that fixed it. 73 Wayne K4ELO On Sat, Dec 22, 2012, at 04:25 PM, Dan Parsons wrote: > I had the exact same problem with my Flex 5000 setup and had great > success > with the T-4-500 line isolator from Radio Works. I'm using it with a > Butternut HF9V vertical. Everyone's RF situation is different so I can't > say for sure if it will fix your problem, but it made a night and day > difference for me. > > Dan > > > On Sat, Dec 22, 2012 at 2:15 PM, Robert Costa wrote: > > > All, > > > > As you may have seen from previous posts, that I have RF ingress issues on > > my Flex 5000a restricting my use of the flex to 40 meters and below. As I > > want to start addressing these issues, I would like to know what products > > others have used. > > > > I need to eliminate common mode currents at the feedpoint of my 80-10 > > meter dipole. I have seen Radio Works line isolators, but have been told > > that they are not very effective. I have been told to use a W2DU current > > UNUN from a company like the wireman. > > > > I am open to suggestions as I do not want this to be an extended > > engineering science fair. > > > > As this RF ingress issue has been a complete irritating experience with my > > Flex, I would like to hear who has used what and what the results and over > > all costs have been. > > > > Thank you, > > > > Robert > > KB6QXM > > ___ > > Flexedge mailing list > > flexe...@flex-radio.biz > > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is > > used for posting topics related to SDR software innovation and other > > technical SDR topics. > > > ___ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] [FlexEdge] Suggestions
I had the exact same problem with my Flex 5000 setup and had great success with the T-4-500 line isolator from Radio Works. I'm using it with a Butternut HF9V vertical. Everyone's RF situation is different so I can't say for sure if it will fix your problem, but it made a night and day difference for me. Dan On Sat, Dec 22, 2012 at 2:15 PM, Robert Costa wrote: > All, > > As you may have seen from previous posts, that I have RF ingress issues on > my Flex 5000a restricting my use of the flex to 40 meters and below. As I > want to start addressing these issues, I would like to know what products > others have used. > > I need to eliminate common mode currents at the feedpoint of my 80-10 > meter dipole. I have seen Radio Works line isolators, but have been told > that they are not very effective. I have been told to use a W2DU current > UNUN from a company like the wireman. > > I am open to suggestions as I do not want this to be an extended > engineering science fair. > > As this RF ingress issue has been a complete irritating experience with my > Flex, I would like to hear who has used what and what the results and over > all costs have been. > > Thank you, > > Robert > KB6QXM > ___ > Flexedge mailing list > flexe...@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is > used for posting topics related to SDR software innovation and other > technical SDR topics. > ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
