Re: [IRCA] AC twin lead or speaker wire for lead in.
Craig, Guy Atkins on another list suggested QS6, the Quad shield cable, 2 sets of braid and two sets of foil. Apparently that is what the cable companies use. I have never tried it, but I did a google search and it quite popular. I went out tonight and attached a ground at the far end of the RG6 running to the beverage. The directivity seemed to help. KFI 640 got weaker and the stations behind KFI were a bit better, so something is up with the RG6. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] AC twin lead or speaker wire for lead in.
> There was an article foating around called something like, Is Your lead > in a snake? There were experiments about grounding the coax. This was simply laid on the ground in a fairly straight line. Nothing buried. I tried ground each end separately, and both ends. Nada.. I could try grounding every 50 feet, as the coax is that length with barrel connectors. It'd be easy to ground. I'll grab some ground rods next time I'm past Home Depot or Lowe's. I have 300' of the Radio Shack coax. What I may try is to run two 150' lengths side by side and set them up as a balanced line. I may even be able to twist them together. That way I can see what the leakage is, and if grounding the shields at either end or both ends has any effect. I should make up a balun for that. The resultant impedence would probably be 200 ohms. A 2:1 turns ratio balun would be appropriate. > By your experiments Craig, it sounds like the coax is an issue. Now, > why doesn't coax going to an FM or TV antenna affect the > directivity? Or does it? I have no idea if it does, or why. I would think that it does not and I have no clue as to why. Again, should be easy to test. I can just lay out the coax, terminate it with the dummy load and tune through the FM band with the Blaupunkt in the truck. Another thing I tried is winding a dozen turns of RG-58 through an FT-290-75 toroid core to make a choke. Made no difference, grounded or not. > We all know that coax is good for shelding against noise, but the > thought of the coax even with matching transformers affecting the > pattern is for concern. I wonder if there is any coax out there that > would work. It sounds like the general run of the mill coax is suspect. > I still like using coax as it is good against water and noise. Hardline? > I wonder what would be the best. Dallas Lankford apparently also uses shielded twinax. This cable was used extensively in older IBM servers instead of ethernet cable. I had a client with an AS400 IBM maybe 15 or 20 years ago. That stuff was really expensive and not all that easy to use. It was about the diameter of RG8 and required special connectors. IIRC, the R390A used one of those connectors on the back for the balanced input. >In my daytime tests of checking the R8 with coax from in the house > and out in the back running the antennas directly into the receiver, I > did not find any difference as far as I could tell. Nothing "jumped" out > at me. So I wonder in reality, if the difference is in what type of an > antenna is used, loop vs beverager vs EWE.? The load might make a > difference too. Any thoughts? There are a mess of things that don't make sense to me, not the least of which is why the input leakage happens in a shielded line in the first place. That's one reason I've tossed this out here. To see what others have found, if they've been down the same path. Craig Healy Providence, RI ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] Convention
Frank, I will be at the IRCA convention with Dave Williams. John Adams from Seaside is also attending. Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] Convention
Right now, I'm planning on attending both. Phil Bytheway --- [EMAIL PROTECTED] wrote: > how many going to the iRCA convention? > > how mnay going to the NRC/WTFDA convention? > > > > ** Get a sneak peek of the all-new > AOL at > http://discover.aol.com/memed/aolcom30tour > ___ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the > original contributors and do not necessarily reflect the opinion of the > IRCA, its editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: irca@hard-core-dx.com > > Choose the right car based on your needs. Check out Yahoo! Autos new Car Finder tool. http://autos.yahoo.com/carfinder/ ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] More coax experiments
I went back out tonight after tuning in KFI 640 and I could hear something u/KFI off the Eastern beverage. I tried the test again with grounding the far end of the coax at the matching transformer. KFI got weaker and the station(s) behind KFI were more there. I am beginning to really feel that the coax indeed is affecting the directional pattern of the antennas. But what to do about it.? I can run anything under the house, but the last 6-8 feet has to be buried, so open wire probably is not an option. I yes I could run coax and ground the shield every few feet. That might help, but it is alot of extra work. I wonder if there is coax out there that has no extra pickup? It must be the shielding. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax experiments
Dennis, My EWEs and beverage are all grounded at the end and at the far end of the matching transformer, but I also tried to ground the coax, braid side. It did affect things a bit and I got more noise. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] AC twin lead or speaker wire for lead in.
Craig, There was an article foating around called something like, Is Your lead in a snake? There were experiments about grounding the coax. By your experiments Craig, it sounds like the coax is an issue. Now, why doesn't coax going to an FM or TV antenna affect the directivity? Or does it? We all know that coax is good for shelding against noise, but the thought of the coax even with matching transformers affecting the pattern is for concern. I wonder if there is any coax out there that would work. It sounds like the general run of the mill coax is suspect. I still like using coax as it is good against water and noise. Hardline? I wonder what would be the best. In my daytime tests of checking the R8 with coax from in the house and out in the back running the antennas directly into the receiver, I did not find any difference as far as I could tell. Nothing "jumped" out at me. So I wonder in reality, if the difference is in what type of an antenna is used, loop vs beverager vs EWE.? The load might make a difference too. Any thoughts? 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] coax experiments
Pat, My ewe is grounded at the transformer and terminating resistor. The ewe is raised nightly, I set up the antenna and go inside and check the receiver with KGO's signal. If the signal is S-9 or less I know there is a bad ground connection. Checking the grounds at each end of the ewe reveals a bad or no connection to ground. Once connected to ground at the terminating resistor or transformer KGO's signal is back to it's S-9+40 db. strength. Luckily KGO does not sign-off very often. Dennis, Vancouver, WA ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] AC twin lead or speaker wire for lead in.
> I was once told that when you hook up the coax to the receiver and the > matching transformer, the directivity of the unwanted signals on the > coax for the most part are a non issue. Once you disconnect the coax > from the matching transformer or even terminate it, the pick up will be > heard. Of course going to double/triple shield or maybe bigger stuff > (RG213), hardline may solve the issue too. My question is just where does this signal input come from? If the coax and dummy load shielding is good, then theoretically there should be no way in for those signals. How do they get in? My original test was posted on another list, but here's a summary.. What started this was an attempt to phase two copper tube loops. They were set in line so each nulled a N/S line, and set in phase. They were about 200' apart and connected by two 150' runs of new Radio Shack RG-58 coax run to the phaser. I then attempted to phase one against the other to try to generate a second null. What I found was that the whole setup was pretty much omnidirectional regardless of the placing of the loops, or any action of the phaser. I tried both a home-made phaser and the DX Engineering NCC-1. Nothing. Couldn't reduce any signals by any appreciable amount. I then disconnected everything except one of the coax runs. It was connected directly to the receiver and the far end to a shielded dummy load. With the dummy load connected directly to the radio, no signals at all were heard. With the 150' of coax in line, it functioned almost as well as a BOG. I first attributed it to the el-cheapo Radio Shack cable. Next test was to duplicate the testing, but with a brand new run of good quality RG-6 coax. Oddly, the results were identical. This coax was Belden (good brand name), fresh out of the box, and new connectors crimped on. At this point I was rather confused. Maybe it wasn't "cheap coax" after all. Next I made an "un-un" which is an isolation transformer with a 1:1 ratio. I think I had 8 turns bifilar wound on an Amidon FT-87-J core. Made absolutely no difference. Connect the dummy load through the "un-un" right to the radio, no signal. Put the 150' of RG-6 in there and it became an antenna. I tried several further tests involving various types of grounding, including driven rods, radials, and even parking next to a known good ground. No difference. Nothing I tried with coax would reduce the incidental pickup. This unwanted pickup was spoiling any nulls by introducing signals of random phase to the antenna. After the first couple of hours of trying, I just gave up. This same receiver/phaser system using two BOGs of about 450' length produced exceptionally good results, so it isn't the equipment. The receiver used is outlined on the am-dx.com site as my truck installation. So, today's test that provided some useful signal isolation was a very welcome bit of progress. I will build off this to try to improve it. Next thing will be to ground other pairs in the CAT5 cable to see if the unwanted signals can be reduced further. I also am going to use a couple pairs to get 12vdc to a preamp at the antenna end. That will further swamp the unwanted signals. Multiple pairs are useful. And, it is wired using normal ethernet connectors and configuration. I can buy a premade ethernet cable and use that. After the coax tests, I'm not at all sure that *any* coax would do what I need. I should drop a note to Dallas Lankford and run this past him to get his thoughts. Craig Healy Providence, RI ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] coax experiments
After I finished checking out the coax last night, today I tried something else out, I tried everal years ago. Some people report better results grounding the far end of the coax going to the matching transformer. Mine ground on that end has always been floating, grounding on this end at the receiver, the far end to directly to the matching transformer. Then on the other side, the antenna & ground. Tonight I tried to also ground the shield side of the coax to a groundrod. It changes things a bit. First thing I noticed was a slight drop in signal on some stations, not the locals. The second, the noise level went up a bit. I disconnected the clip and left it as it was. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] WWV Solar Report
:Product: Geophysical Alert Message wwv.txt :Issued: 2007 Aug 18 0008 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Environment Center # # Geophysical Alert Message # Solar-terrestrial indices for 17 August follow. Solar flux 68 and mid-latitude A-index 4. The mid-latitude K-index at UTC on 18 August was 2 (15 nT). No space weather storms were observed for the past 24 hours. No space weather storms are expected for the next 24 hours. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Trends -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Date 16 16 16 16 16 17 17 17 17 17 17 17 17 18 UTC 0900 1200 1500 1800 2100 0300 0600 0900 1200 1500 1800 2100 SFlx 68 68 68 68 67 67 67 67 67 67 67 67 68 68 A-in 99997888888844 K-in 33211221111112 ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] AC twin lead or speaker wire for lead in.
Craig, I was once told that when you hook up the coax to the receiver and the matching transformer, the directivity of the unwanted signals on the coax for the most part are a non issue. Once you disconnect the coax from the matching transformer or even terminate it, the pick up will be heard. Of course going to double/triple shield or maybe bigger stuff (RG213), hardline may solve the issue too. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] AC twin lead or speaker wire for lead in.
Dennis, Even though I have never used AC twin, I would be concerned for the noise issue. The directional issue may not be there as you are separating the lead-in with the antenna with a matching transformer. I could easily buy some speaker wire and try it, but I would have to put in a bit of impedience matching. There might be some loss there. Burying the AC twin may be an issue too. As I direct bury the waterproof RG6 right in the ground. 73, Patrick P.S. For the record, I have taken the R8 right out to the antenna, bypassing the coax to compare s meter readings. I did it last Summer. I got the same meter readings, so the loss of .5 DB with the RG6 is so small you can't even see it on the s meter. ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] QSL Report
J.D. Great going. I wonder why a new design of cards. Their old card that I have has "Marti" a pix of him on the front. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] AC twin lead or speaker wire for lead in.
> > "Dallas Lankford uses ordinary AC twin lead or speaker wire. He says it > > works better than coax. With a balun, of course." > > I use a coax with a 100' run NE of the ewe balun. Would using AC twin > lead or speaker wire affect the directional pickup of the ewe? Would > noise level increase The above method would be less expensive than > buying coax and the connectors. Much easier to replace when my lab > chews on a the coax cable. I suppose the best way to test it is to disconnect the far end. Either short the center to the shield, or (better) terminate it on a shielded 50 ohm dunny antenna. In my tests, both Radio Shack RG-58 and good quality RG6 TV lead in had a significant amount of undesired signal. For example, with 150 feet of RG-58 rolled out in my yard and terminated in a shielded dummy load, I still could hear all of my normal locals at good level. WSKO-790 was at S9+20 for example. No type of grounding made the least bit of change. If you have significant signal, then it's worth a shot to try replacing it with a balanced line. Coincidentally, I just finished testing a 150' run of CAT5 ethernet cable this afternoon. I made a 100 ohm termination for the far end, and a 100 ohm to 50 ohm balun. Leakage signals dropped a significant amount. I could hear the strongest locals, but not much else. A real improvement. I took one of my 30" copper tube loop antennas and wound a second pickup on the toroid. I used six turns connected to a standard RJ-45 jack. Plugged in the ethernet, and had nice signal levels on the radio. Turning the loop did show significant nulling, unlike when I tried to use it with the RG-58 coax. It's only a short test, but results are encouraging. Parts: Home Depot CAT5 indoor/outdoor cable bought in a 500' carton size. Used a 150' run with nornmal RJ-45 ethernet connectors on the ends. Homemade balun: BNC connector to 8 turns on a FT-87-J toroid core. 12 turns punched down to an RJ-45 ethernet jack. I will experiment with different turns eventually. That ratio was just a guess pulled out of thin air. Antenna end is the six turns through the FT-240-75 toroid which is on the 30" copper tube loop. I only used the blue/blue-white pair in the cable. The other three pairs were left unconnected. Further tests will involve grounding one or more pairs and seeing if grounds at either end make any reduction in the input leakage signal. Craig Healy Providence, RI ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] AC twin lead or speaker wire for lead in.
--- [EMAIL PROTECTED] wrote: > > "Dallas Lankford uses ordinary AC twin lead or speaker wire. He says > it > works better than coax. With a balun, of course." > > I use a coax with a 100' run NE of the ewe balun. Would using AC > twin lead or speaker wire affect the directional pickup of the ewe? > Would noise level increase The above method would be less expensive > than buying coax and the connectors. Much easier to replace when my > lab chews on a the coax cable. > Dennis, Vancouver, WA > As most of us are probably aware, conventional wisdom has always been that you need that grounded shield to reduce verticcal pickup of both electrical noise and unwanted signals. Many of us have probably experienced it working that way. On the other hand, Dallas Lankford is a very technically savvy guy, so all I'd say is try it and see...although the lab is likely to sever it with one bite. Russ Edmunds Blue Bell, PA ( 360' ASL ) [15 mi NNW of Philadelphia] 40:08:45N; 75:16:04W, Grid FN20id <[EMAIL PROTECTED]> FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15' AM: Hammarlund HQ-150 & 4' FET air core loop Boardwalk for $500? In 2007? Ha! Play Monopoly Here and Now (it's updated for today's economy) at Yahoo! Games. http://get.games.yahoo.com/proddesc?gamekey=monopolyherenow ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] WJVC 1290 AM Jacksonville NC
--- John Cereghin <[EMAIL PROTECTED]> wrote: > Having worked at two radio stations in my life, I > can understand how board operators tend to "forget" > to flip certain switches at certain times! Any more there aren't many stations live at night. And virtually no one with ANY sense leaves power change to a person. The Burk or Sine boxes do well for that, though when they goof up it can be a problem if no one pays attention to their station. Powell POP email is powell at backroads DOT net ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] Ants in my pants
I've been bitten by fire ants here on the WABV property.. and it's no fun, the bites itch like hell! Paul On 8/17/07, Powell E. Way III W4OPW <[EMAIL PROTECTED]> wrote: > > > This morning I mentioned that it felt like I had ants > in my pants (on the air ) .. WELL I did. Fire > ants. Got more when I went to lunch. UGH! They got > into the truck. I forgot about that . that they > had gotten in there and got into some dog treats I had > there. Well, I normally drive the Station Wagon that > has AM stereo. I guess the truck gets to rest again. > > the very Pedantic (and ANTsy) Powell !! > > > POP email is powell at backroads DOT net > ___ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the > original contributors and do not necessarily reflect the opinion of the > IRCA, its editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: irca@hard-core-dx.com > > -- Sincerely, Paul B. Walker, Jr. www.walkerbroadcasting.com www.myspace.com/walkerbroadcasting ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] QSL Report
U.S.A.: Radio Marti-1180, Marathon, FL. P/d letter in 7 days after a followup. V/s: Margaret Ray de Arenas - Assistant to the Director. Letter also said they were designing new QSL cards (something they've been saying for at least 2 years), and that I'd be sent one "as soon as they are avsilable". (JDS-AL) 73 - J.D. Stephens Hampton Cove, AL, USA Need a vacation? Get great deals to amazing places on Yahoo! Travel. http://travel.yahoo.com/ ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] AC twin lead or speaker wire for lead in.
"Dallas Lankford uses ordinary AC twin lead or speaker wire. He says it works better than coax. With a balun, of course." I use a coax with a 100' run NE of the ewe balun. Would using AC twin lead or speaker wire affect the directional pickup of the ewe? Would noise level increase The above method would be less expensive than buying coax and the connectors. Much easier to replace when my lab chews on a the coax cable. Dennis, Vancouver, WA ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] Fw: ARLP034 Propagation de K7RA
- Original Message - From: "W1AW Mailing List" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: Sent: Friday, August 17, 2007 11:39 AM Subject: ARLP034 Propagation de K7RA > SB PROP @ ARL $ARLP034 > ARLP034 Propagation de K7RA > > ZCZC AP34 > QST de W1AW > Propagation Forecast Bulletin 34 ARLP034 >>From Tad Cook, K7RA > Seattle, WA August 17, 2007 > To all radio amateurs > > SB PROP ARL ARLP034 > ARLP034 Propagation de K7RA > > We're on the road this week, and post this bulletin from > Hillsborough County, New Hampshire. > > Solar activity continues low. The sun is currently spotless, but > sunspots may return around August 20. This week's average daily > sunspot numbers were down about a point from last week's, from 12.4 > to 11.3. > > Expect quiet geomagnetic conditions over the next week, according to > a forecast from the US Air Force, which predicts planetary A index > for August 17-23 of 8, 5, 10, 5, 5, 10 and 8. But Geophysical > Institute Prague has quite a different prediction for August 18. > They predict quiet conditions for August 17, unsettled to active on > August 18, unsettled August 19, quiet August 20-21, unsettled August > 22, and quiet to unsettled August 23. > > Jerry Reimer, KK5CA of Spring, Texas, sent in some interesting > comments about NVIS (Near Vertical Incidence Skywave) propagation > and antennas, and ionospheric data available on the internet. An > automated ionospheric sounder, or isosonde, beams energy straight up > while sweeping the signal up in frequency, thereby determining the > MUF or Maximum Usable Frequency of that area by measuring the > reflected signal. Jerry says that NVIS communication (which is used > to communicate with stations out to about 200 miles maximum) is best > at a frequency 50 to 80 percent below the MUF from the isosonde. So > if the MUF of the patch of ionosphere overhead is 10 MHz, then NVIS > is best between 2-5 MHz. With NVIS, users are trying to get high > angle radiation instead of low angle, which is usually the goal with > other modes of HF communication. A page explaining Vertical > Incidence Soundings is linked from > http://www.ngdc.noaa.gov/stp/IONO/ by clicking on the Vertical > Soundings link on the left of the page. > > He also pointed out some interesting real-time maps showing > continent-wide communication between various points at > http://www.ips.gov.au/HF_Systems/4/1. For instance, if > you select Hourly HAP Charts, then select Kansas City, what you will > see is the best frequencies for communications with Kansas City from > across the continent at that time. So you can look at the color > region over any point on the map, and this is keyed to the best > frequency for communicating with Kansas City from that point. > > More about NVIS and ionospheric soundings in next week's bulletin. > > If you would like to make a comment or have a tip for our readers, > email the author at, [EMAIL PROTECTED] > > For more information concerning radio propagation, see the ARRL > Technical Information Service at > http://www.arrl.org/tis/info/propagation.html. For a detailed > explanation of the numbers used in this bulletin, see > http://www.arrl.org/tis/info/k9la-prop.html. An archive of past > propagation bulletins is at http://www.arrl.org/w1aw/prop/ . > Monthly propagation charts between four USA regions and twelve > overseas locations are at http://www.arrl.org/qst/propcharts/. > > Sunspot numbers for August 9 through 15 were 14, 14, 13, 11, 13, 14 > and 0 with a mean of 11.3. 10.7 cm flux was 67.4, 67.5, 67.6, 68.1, > 67.7, 68.5, and 67.6, with a mean of 67.8. Estimated planetary A > indices were 4, 13, 12, 6, 3, 6 and 8 with a mean of 7.4. Estimated > mid-latitude A indices were 2, 10, 7, 5, 2, 3 and 6, with a mean of > 5. > > /EX > > ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] 1575 kHz VOA Thailand clip
Charles, Will send a report in September or when I get a little better audio. This morning was a good for VOA 1575 too. Today they led the TPs with the strongest signal. Now have two recorders and I can dedicate a receiver and recorder to the station that is the target while dxing other stations on the other radio. Also I could wait and record a clip off the R-390 A when it's finish being repaired. My plan is to QSL some to these TP's this season. Dennis, Vancouver, WA -- Original message -- From: Charles A Taylor <[EMAIL PROTECTED]> > At 11:01 PM 8/16/2007 +, you wrote: > > > >Just checked the tape of VOA 1575 kHz Thailand heard this morning at 1200 > >ut. Washington D.C. > >mentioned at TOH. Have a brief clip of the tape on my web page. > > > >http://home.comcast.net/~vroomski/wsb/html/view.cgi-home.html-.html > > > >Dennis, > >Vancouver, WA > > Dennis, > > Where are you gonna send the report? > > Charles > > Charles A Taylor, WD4INP > > Greenville, North Carolina > > > ___ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the original > contributors and do not necessarily reflect the opinion of the IRCA, its > editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: irca@hard-core-dx.com > ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] WWV Solar Report
:Product: Geophysical Alert Message wwv.txt :Issued: 2007 Aug 17 1803 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Environment Center # # Geophysical Alert Message # Solar-terrestrial indices for 16 August follow. Solar flux 67 and mid-latitude A-index 8. The mid-latitude K-index at 1800 UTC on 17 August was 1 (6 nT). No space weather storms were observed for the past 24 hours. No space weather storms are expected for the next 24 hours. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Trends -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Date 16 16 16 16 16 16 16 17 17 17 17 17 17 17 UTC 0300 0600 0900 1200 1500 1800 2100 0300 0600 0900 1200 1500 1800 SFlx 68 68 68 68 68 68 67 67 67 67 67 67 67 67 A-in 99999978888888 K-in 22332112211111 ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] WJVC 1290 AM Jacksonville NC
Having worked at two radio stations in my life, I can understand how board operators tend to "forget" to flip certain switches at certain times! Whatever the semantics, I'm just glad I got me station #570 for me log! :D ---John Cereghin Smyrna DE Charles A Taylor <[EMAIL PROTECTED]> wrote: At 07:02 PM 8/16/2007 -0700, you wrote: >Hearing WJVC, 1290 from Jacksonville NC at 2200 EDT with continuous >Southern Gospel music, ID at TOH. Listed nighttime power of 40 watts but >very good signal. Cheating? >John Cereghin KB3LYP >Smyrna DE John, "Cheating" is probably not the correct term. I think this is one of those "forgot to power down" mistakes. Usually WJCV is out of my nighttime picture here in Grifton (NC) not far from WJCV. Charles Charles A Taylor, WD4INP Greenville, North Carolina ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] WWBA-1040
Willis, you dredged up (more) old dx memories here. I remember receiving this fellow when he was WHBO back in the early 80s. Would sign on around 3:30-3:45 PST & often blow WHO away. Back before the bands got totally cluttered. Don K. S.F. CA k4ape wrote: > 1040 WWBAFL PINELLAS PARK 2150 16.08.07 > "NEWS TALK 1040, WWBA" THEY ARE RUNNING SOME TYPE OF TALK SHOW, BUT CAN > NOT DETERMINE WHO IT IS. TWO DAS FOR COMPINAYS IN FLORDIA. [WM-TN] > > They are running late on their day power; QRMing WHO at times. > > DXer: Willis, K4APE > QTH: Old Fort, TN > ANTENNA: 149' long wire > RCVR: Drake R-4C > > ___ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the original > contributors and do not necessarily reflect the opinion of the IRCA, its > editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: irca@hard-core-dx.com ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] Ants in my pants
Powell, That sure does not sound like fun. No fire ants here, just the tiny black moisture ants and a termite or two, mainly in the Fall. When I was in New Orleans, I was walking through the old area and leaned up against a wooden telephone pole to change the roll of film in my camera. There were these arts brownish black that got on me, and boy do those bite! Those may have been fire ants,I don't know, but not fun. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] KEX-1190/KPOJ-620
I notice both KEX 1190 & KPOJ 620 are on lower power today. Both are down about 8 DB. The rest of the stations are normal. Also for the 2nd time in a week KEX has no IBOC. I wonder if CC is getting ready for 24 hr IBOC on both KPOJ & KEX? 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] DX Update From Northern Delaware: need some help - thanks!
Bill - >>Maybe this will help? >> >>http://www.premiereradio.com/news/view/380.html >> >>"Effective August 1, WJLG-AM 900 in Savannah, Ga., >>became a FOX Sports Radio affiliate. The all-sports >>station now airs the network 24/7 with theexception >>of The Jim Rome Show." Indeed it will! Thanks for the additional confirmation! Regards, -Pete Jernakoff- K3KMS Wilmington, DE www.21centimeter.com This communication is for use by the intended recipient and contains information that may be Privileged, confidential or copyrighted under applicable law. If you are not the intended recipient, you are hereby formally notified that any use, copying or distribution of this e-mail, in whole or in part, is strictly prohibited. Please notify the sender by return e-mail and delete this e-mail from your system. Unless explicitly and conspicuously designated as "E-Contract Intended", this e-mail does not constitute a contract offer, a contract amendment, or an acceptance of a contract offer. This e-mail does not constitute a consent to the use of sender's contact information for direct marketing purposes or for transfers of data to third parties. Francais Deutsch Italiano Espanol Portugues Japanese Chinese Korean http://www.DuPont.com/corp/email_disclaimer.html ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] Ants in my pants
This morning I mentioned that it felt like I had ants in my pants (on the air ) .. WELL I did. Fire ants. Got more when I went to lunch. UGH! They got into the truck. I forgot about that . that they had gotten in there and got into some dog treats I had there. Well, I normally drive the Station Wagon that has AM stereo. I guess the truck gets to rest again. the very Pedantic (and ANTsy) Powell !! POP email is powell at backroads DOT net ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax loss
Russ, I have always used that method is testing the coax as it is the best way with just an inexpensive ohm meter. I also will test across the conductors to see if there is any breakdown between the two. But I did forget about the ohm meter adding resistance to the circuit and the error amount. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax loss
Rick, That is a nice piece of gear, but a bit spendy for me. The A-B test between a new piece of coax and the suspect is a lot less money. hi. Now especially since I went ahead and attached the banana plugs to the RG59. I can easily run the coax out the door to check any issues. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax loss
Chuck, Thanks. I did not know the fiqure, but I thought it would be less than 1 DB per 100 feet at 1 MHZ. Less than.5 DB is really a non issue. hi. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax loss
Thanks Chuck. I just don't want any extra loss. I was thinking last night, if I switched to hardline or RG213, I probably would still have the same S Meter readings. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] 1575 kHz VOA Thailand clip
At 11:01 PM 8/16/2007 +, you wrote: >Just checked the tape of VOA 1575 kHz Thailand heard this morning at 1200 >ut. Washington D.C. >mentioned at TOH. Have a brief clip of the tape on my web page. > >http://home.comcast.net/~vroomski/wsb/html/view.cgi-home.html-.html > >Dennis, >Vancouver, WA Dennis, Where are you gonna send the report? Charles Charles A Taylor, WD4INP Greenville, North Carolina ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] WJVC 1290 AM Jacksonville NC
At 07:02 PM 8/16/2007 -0700, you wrote: >Hearing WJVC, 1290 from Jacksonville NC at 2200 EDT with continuous >Southern Gospel music, ID at TOH. Listed nighttime power of 40 watts but >very good signal. Cheating? >John Cereghin KB3LYP >Smyrna DE John, "Cheating" is probably not the correct term. I think this is one of those "forgot to power down" mistakes. Usually WJCV is out of my nighttime picture here in Grifton (NC) not far from WJCV. Charles Charles A Taylor, WD4INP Greenville, North Carolina ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax loss
--- Chuck Hutton <[EMAIL PROTECTED]> wrote: > Garden variety RG6 runs 9 or 10 Ohms per 1000' of center conductor, > so > Patrick's 75' length really ought to have about .75 Ohms of DC > resistance. > > I'd bet his meter is contributing to the "problem". > > A "problem" it isn't - an Ohm or two in series with his 50 Ohm input > won't > produce enough loss to be noticeable at all. > > > Chuck > > *** I agree with Chuck - the average meter has an error range greater than what is being seen here. If you were using professional-grade equipment, I'd bet you'd see lower readings. Also remember that those readings are at double your length - out and back - and are also using the shield as a conductor, which it isn't meant to be, so you could be adding a bit of resistance in that way as well.. Russ Edmunds Blue Bell, PA ( 360' ASL ) [15 mi NNW of Philadelphia] 40:08:45N; 75:16:04W, Grid FN20id <[EMAIL PROTECTED]> FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15' AM: Hammarlund HQ-150 & 4' FET air core loop Luggage? GPS? Comic books? Check out fitting gifts for grads at Yahoo! Search http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] (no subject)
how many going to the iRCA convention? how mnay going to the NRC/WTFDA convention? ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] NE Oregon Friday TPs
Today was an Asian TP morning to about 1230 utc, then the DU's picked up and eventually dominated to just past 1300 utc. Lots of hets still, just weaker, to about 1315 utc. 1575 had talk at 1210 utc, poor level. At 1230 1566's het increased noticeably but couldn't pull any audio out. 594, poor with talk; 774 poor with talk; 828 poor/weak with Asian talk, possibly English lessons--all 1210-1230 utc. Later, 648 with pop music at 1253 utc; 828 weak/medium, English talk 1255 utc--best audio today; 855 brief fadeup with English talk at 1256 utc; 774 weak English talk 1302 utc; 738 poor English talk, 1305 utc. Russian LWBC doing well at the start, 279, 234, 189, 180, 153--1205 utc. 530 ADK beacon stronger than usual today, 1236 utc. Steve NE Oregon R75, longwires, active whip ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] Tps for 08/17/07
Listened from 1100-1315 ut. VOA Thailand 1575 kHz in this morning with a good signal at times. (1220) Strongest of the other TPs with audio at this time. At 1245 splatter from KCVR-1570 (assumed) playing SS mx. 153 Russia, Radio Rossii 1101 fair with man in Russian. 189 Russia, Radio Rossi fair at 1293 man in Russian. 774 Japan, JOUB fair at 1127 man in Japanese. Fair at 1238 with English lessons. 1053 DPR Korea, very weak traces of audio 1136. 1566 Republic of Korea, HLAZ weak at 1145 woman in Asian lanuage. 1575 Thailand, VOA threshold audio at 1146. Weak at 1200 and fair at 1209 with music & Asian language talk. S-9+20 db at 1251. Weak at 1313. 1593 China, CNR1 weak at 1242 with Asian language talk. // 5030. 2485 Austrialia, Katherine good at 1305 interview of Tom Thompson. ABC commerical for Darwin TV at 1209. Carriers & levels, 6279 5693-828 4 594-648-666-738-1062-1089-1134-1179-1278-1287-1323- 1377-1386-1413-1422-1458-1467-1503-1512-1584-1593 3 234-567-657-666-747-837-873-1098-1107-1116-1512-1602 2 531-675-702-936-1035-1494-1539-1557 Dennis, Vancouver, WA JRC 545 & R-8B Ewe NW -H-800 active whip 56.3 F 81% RH Sunrise 1213 ut Sunset 0315ut ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax loss
Patrick Martin wrote: > Thanks Chris. I have always been a nit-picker when it comes to my > antennas and coax. I try to squeeze every 1 millionth DB out of them. I > guess I go overboard as some have said. It seems I am always out there > trying to make improvements on everything. Probably 99% of the time, > there is no difference. I generally test any suspect cables with an Anritsu time-domain reflectometer, but most folks won't have access to a piece of test equipment this expensive. I also have one of these: http://www.mfjenterprises.com/products.php?prodid=MFJ-269 and find it a very handy piece of test gear to have. Whether you'd get enough use out of it to justify purchasing one of these or just be better off putting the cash into new coax you'd have to decide. An ohm meter will tell you only one part of the picture, i.e. ohmic losses in the center conductor and shield. And as was mentioned up the thread, since you are testing using DC, you don't get the same skin-effect as you would using an RF test signal. You can't measure dielectric losses, overall loss at a particular frequency, impedance, or velocity factor. But it sure would tell you if you had serious corrosion and very high resistive losses. Rick Kunath ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax loss
Patrick: All the manufacturers provide data showing cable loss at a wide range of frequencies. Some will have data at 1 MHZ and some only go down to 5 MHZ since cable systems don't use the frequencies below 5 MHZ. At 1 MHZ you can expect about .5 dB of loss per 100 feet - a total non issue. Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Martin Sent: Thursday, August 16, 2007 9:08 PM To: Mailing list for the International Radio Club ofAmerica Cc: Mailing list for the International Radio Club ofAmerica Subject: Re: [IRCA] coax loss Has anyone ever measured the loss of RG59/RG6 at 1 MHZ? All material I have read was 100 MHZ. 73, Patrick Patrick Martin KAVT Reception Manager ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] coax loss
Garden variety RG6 runs 9 or 10 Ohms per 1000' of center conductor, so Patrick's 75' length really ought to have about .75 Ohms of DC resistance. I'd bet his meter is contributing to the "problem". A "problem" it isn't - an Ohm or two in series with his 50 Ohm input won't produce enough loss to be noticeable at all. Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Craig Healy Sent: Thursday, August 16, 2007 8:07 PM To: Mailing list for the International Radio Club of America Subject: Re: [IRCA] coax loss > I have been checking out all of my RG6 this Summer with an ohm meter. I > have found with 3 pieces of the coax (SW EWE,WNW EWE, and 1500' > beverage) that the coax is a hair leaky. Maybe because of the age. 90% > of it runs under the house for the SW EWE and beverage. Using an ohm > meter in the RX1 scale instead of getting a full scale when shorting one > end together (braid to center, I get anywhere from 2.5 to 5 ohms.testing > on the far end, so almost a full scale. Using the coax for MW use, > would I notice any change if I replaced all of the coax? The coax runs > are about 75-80 feet each. I have an old 100 foot roll of RG59 I have > never used. So rolled up I did the same check and got a full scale. Any > thoughts? 2.5 Ohms doesn't seem out of line. Just to recap, you shorted the far end center conductor to the shield and then measured the near end, center to shield? For a run of 75 feet or so, I'd expect a few ohms. Most RG6 has a steel center conductor that's copper plated. The resistance of steel at lower frequencies is why it's not recommended for video use, for example. At VHF, the skin effect keeps most of the signal on the copper plating. I am surprised that the new RG59 didn't show the same or even slightly higher resistance. Did you notice any water getting into the RG6 and connectors? That could have worked down the inside and corroded the shield. The cable isn't all that expensive. I'd consider replacing it. Take the worst section and do a before/after on local daytime signals. That'll tell you just what you may or may not gain by the swap. I am looking at using CAT5 ethernet cable. It's cheap, and the balanced design may help reduce signals leaking in and spoiling the antenna pattern. However, that does require a balun to match the roughly 110 ohm balanced impedence to the 50 or 75 ohm unbalanced coax connection. Still, it's worth the shot. Home Depot sells indoor/outdoor CAT5 in 500' boxes. If I have time (and ambition) this weekend I'll make up a couple of baluns and a 150' CAT5 test length to compare to some RG58 and RG6 lengths. Dallas Lankford uses ordinary AC twin lead or speaker wire. He says it works better than coax. With a balun, of course. Craig Healy Providence, RI ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
[IRCA] WWBA-1040
1040 WWBAFL PINELLAS PARK 2150 16.08.07 "NEWS TALK 1040, WWBA" THEY ARE RUNNING SOME TYPE OF TALK SHOW, BUT CAN NOT DETERMINE WHO IT IS. TWO DAS FOR COMPINAYS IN FLORDIA. [WM-TN] They are running late on their day power; QRMing WHO at times. DXer: Willis, K4APE QTH: Old Fort, TN ANTENNA: 149' long wire RCVR: Drake R-4C ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
