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Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
JW,
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection http://groups.yahoo.com/group/Shortw...a/message/9097 As you have discovered, most of the time a 'portable' AM / FM Shortwave Radio's Earphone Jack is also coupled to the Radio's RF internal circuitry and is also RF Signal Ground. Using a modified 1/8" Mono Plug can allow you to connect a Ground Wire to the Radio for improved Signal and lower Noise. MODIFIED - 1/8" Mono Plug for a 'portable' Radio's Ground Connection : 1. Remove the Tip Section of the 1/8" Mono Plug leaving just the Rear Barrel Section and Solder Terminal. 2. Solder a Wire (Ground Wire) to the Solder Terminal. 3. Connect the Wire to Ground or the Shack's Ground. 4. Plug the 1/8" Mono Plug into the Radio's Earphone Jack. Your Radio is now Grounded. TIP - This is also a good Travel Ground Connection to have in your Travel Radio's Travelling Bag. Modified 1/8" Mono Plug on one end of a 3'-5' piece of Wire and an Alligator Clip on the other end to clip-on to things. WHAT ABOUT AN ANTENNA ? * Collapse the Radio's Whip Antenna and connect an External Wire Antenna directly to the Whip Antenna for improved FM and Shortwave reception. Note -Some times this also works for AM/MW reception too. * Wrap a few turns of the Exteral Antenna Wire around the Radio to couple the RF Signal to the Radio's built-in AM/MW Ferrite Rod Antenna. TIP - You may wish to consider using a "PWA" Portable Wire Antenna (PWA) - by Tom Sevart PWA = http://www.geocities.com/n2uhc/portablewire.html READ - A Compilation of "Portable Wire Antenna" (PWA) Messages http://groups.yahoo.com/group/Shortw...a/message/5871 http://groups.yahoo.com/group/Shortw...a/message/5894 hope this helps - iane ~ RHF |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On Wed, 19 Apr 2006 13:50:52 GMT, Bob Miller
wrote: On 19 Apr 2006 04:09:02 -0700, "RHF" wrote: excerpted Now be honest. Have you ever attached a ground wire and heard less noise? bob k5qwg Only on my Garrard record changer. |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On 2006-04-19, RHF wrote:
MODIFIED - 1/8" Mono Plug for a 'portable' Radio's Ground Connection : 1. Remove the Tip Section of the 1/8" Mono Plug leaving just the Rear Barrel Section and Solder Terminal. 2. Solder a Wire (Ground Wire) to the Solder Terminal. 3. Connect the Wire to Ground or the Shack's Ground. 4. Plug the 1/8" Mono Plug into the Radio's Earphone Jack. Your Radio is now Grounded. I might be missing something here, but .... If I plug the modufied plug into the earphone jack, the radio's speaker would still be taken out of the circuit. Now that the earphone jack is no longer usable, and the speaker is no longer inline, there would be no audio. In a strange way it makes sense, no audio, much less noise. |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
In article ,
Bob Miller wrote: On 19 Apr 2006 04:09:02 -0700, "RHF" wrote: excerpted Now be honest. Have you ever attached a ground wire and heard less noise? Yes. Remember, a receiver works on the voltage difference between the antenna input and its local ground. If your treat the ground wiring as a sort of antenna, the local noise becomes common mode* and you can (sometimes) arrange the wiring so that the junk cancels out. (*The local receiver ground has the noise added to it, and if it's about the same voltage as on the antenna input, cancels out the noise). I've done this with both my FR-200 and my R-1000. Best case was with a transformer coupled random wire (using an isolated winding to the coax). The arrangement was the ground rod, about 15 feet of wire, the matching transformer, and then the 70-80 foot random wire all in a straight line away from the noise source (my neighbor's dining room lights, I think). This worked well on one band at a time, as the level of noise and pickup from the ground side wire varied. (But an adjustable noise bridge down by the receiver is a heck of a lot more convenient). Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
In article ,
Silfax wrote: On 2006-04-19, RHF wrote: MODIFIED - 1/8" Mono Plug for a 'portable' Radio's Ground Connection : 1. Remove the Tip Section of the 1/8" Mono Plug leaving just the Rear Barrel Section and Solder Terminal. 2. Solder a Wire (Ground Wire) to the Solder Terminal. 3. Connect the Wire to Ground or the Shack's Ground. 4. Plug the 1/8" Mono Plug into the Radio's Earphone Jack. Your Radio is now Grounded. I might be missing something here, but .... If I plug the modufied plug into the earphone jack, the radio's speaker would still be taken out of the circuit. Now that the earphone jack is no longer usable, and the speaker is no longer inline, there would be no audio. In a strange way it makes sense, no audio, much less noise. The cutout switch is driven off the contact for tip of the plug (which is removed). But that also provides the spring detent force to keep the plug from falling out. Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On 19 Apr 2006 15:25:52 -0700, "junius" wrote:
Silfax wrote: On 2006-04-19, RHF wrote: MODIFIED - 1/8" Mono Plug for a 'portable' Radio's Ground Connection : 1. Remove the Tip Section of the 1/8" Mono Plug leaving just the Rear Barrel Section and Solder Terminal. 2. Solder a Wire (Ground Wire) to the Solder Terminal. 3. Connect the Wire to Ground or the Shack's Ground. 4. Plug the 1/8" Mono Plug into the Radio's Earphone Jack. Your Radio is now Grounded. I might be missing something here, but .... If I plug the modufied plug into the earphone jack, the radio's speaker would still be taken out of the circuit. I think step 1 prevents that outcome. In some sockets the switch is opened by the shaft. http://www.action-electronics.com/grc/gc33724.jpg |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
BM - Honestly "YES ! " - ymmv ~ RHF
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Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
In article .com,
"junius" wrote: David wrote: In some sockets the switch is opened by the shaft. http://www.action-electronics.com/grc/gc33724.jpg Ah, okay. Thanks for the visual. I don't think it likely that you would find this type in a portable SW radio. This looks like something that belongs in a cordless phone. It's possible it could though. -- Telamon Ventura, California |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
In article ,
Bob Miller wrote: On 19 Apr 2006 04:09:02 -0700, "RHF" wrote: excerpted Now be honest. Have you ever attached a ground wire and heard less noise? You could use the "ground" to attach to the other side of a dipole. -- Telamon Ventura, California |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On 19 Apr 2006 18:07:00 -0700, "RHF"
wrote: David - Switched or un-switched the Exposed Outer Ring of the 1/8" Mono Jack used for the Earphone Output is usually the Radio's Electrical Circuit Ground and is also the RF Signal Ground. NOTE - This idea and application is mainly for Radios that do not have a built-in External Antenna Input that offers a Grounding "Attachment" Point for the Radio. iane ~ RHF . Why? For what purpose? Ever owned a Drake SW series? |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
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Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
MZ - Right on both points. ~ RHF
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Drake SW1 Radio plus the People's Radio Network PRN1000 Radio and Chuck Harder - Whoa !
David - Here is a re-write :
NOTE - This idea and application is mainly for 'portable' AM / FM Shortwave Radios that do not have a built-in External Antenna Input {Jack} that offers a Grounding "Attachment" Point for the Radio. - - - Be Advised - There are exceptions and ymmv. David - FWIW Somewhere in OK-Land, Cali-4-Ni-A down in sub-basement # 3 is a Drake SW1 Radio -aka- People's Radio Network PRN1000 Radio SW1 = http://www.dxing.com/rx/ssr1.htm http://www.universal-radio.com/catal...rxvr/1100.html http://www.dproducts.be/drake_museum/prn-1000.htm http://www.dproducts.be/drake_museum/prn-1000_pic.htm http://www.eham.net/reviews/detail/1313 http://www.eham.net/reviews/detail/1314 http://www.radionetherlands.nl/featu...ivers/sw1.html FWIW - Bought the Drake SW1 Radio used and it came with a TinyTenna TINY-TENNA = http://www.hamradiofun.com/tinytenna.htm ABOUT - Chuck Harder's "People's Radio Network" (PRN) and The Radio Program "For The People" by Chuck Harder. PRN = http://en.wikipedia.org/wiki/Chuck_Harder CHUCK HARDER = http://www.chuckharder.com/ http://www.pilotproject.tv/view_finalist.php?id=267 FOR THE PEOPLE = http://www.talkstarradio.com/ FTP = http://www.talkstarradio.com/hosts/chuckpage.htm HOSTS = http://www.talkstarradio.com/hosts/meetourstars.htm whoa - end of ramble ~ RHF |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
David wrote:
On Wed, 19 Apr 2006 16:17:19 GMT, (Mark Zenier) wrote: Remember, a receiver works on the voltage difference between the antenna input and its local ground. I thought it worked on resonance. Resonance is one of many things that goes into receiving signals, but when you come right down to it the receiver is nothing more than a device which processes the voltage (or current) fed it from an antenna. You use it to select one of many signals (using resonance), amplify the heck out of it and extract the information from the result. -- All relevant people are pertinent. All rude people are impertinent. Therefore, no rude people are relevant. -- Solomon W. Golomb |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On Thu, 20 Apr 2006 16:09:32 -0500, clifto wrote:
David wrote: On Wed, 19 Apr 2006 16:17:19 GMT, (Mark Zenier) wrote: Remember, a receiver works on the voltage difference between the antenna input and its local ground. I thought it worked on resonance. Resonance is one of many things that goes into receiving signals, but when you come right down to it the receiver is nothing more than a device which processes the voltage (or current) fed it from an antenna. You use it to select one of many signals (using resonance), amplify the heck out of it and extract the information from the result. What's that got to do with a current flowing to ground? |
Drake SW1 Radio plus the People's Radio Network PRN1000 Radio and Chuck Harder - Whoa !
On 20 Apr 2006 14:09:00 -0700, "RHF"
wrote: David - Here is a re-write : NOTE - This idea and application is mainly for 'portable' AM / FM Shortwave Radios that do not have a built-in External Antenna Input {Jack} that offers a Grounding "Attachment" Point for the Radio. - - - Be Advised - There are exceptions and ymmv. David - FWIW Somewhere in OK-Land, Cali-4-Ni-A down in sub-basement # 3 is a Drake SW1 Radio -aka- People's Radio Network PRN1000 Radio SW1 = http://www.dxing.com/rx/ssr1.htm http://www.universal-radio.com/catal...rxvr/1100.html http://www.dproducts.be/drake_museum/prn-1000.htm http://www.dproducts.be/drake_museum/prn-1000_pic.htm http://www.eham.net/reviews/detail/1313 http://www.eham.net/reviews/detail/1314 http://www.radionetherlands.nl/featu...ivers/sw1.html FWIW - Bought the Drake SW1 Radio used and it came with a TinyTenna TINY-TENNA = http://www.hamradiofun.com/tinytenna.htm ABOUT - Chuck Harder's "People's Radio Network" (PRN) and The Radio Program "For The People" by Chuck Harder. PRN = http://en.wikipedia.org/wiki/Chuck_Harder CHUCK HARDER = http://www.chuckharder.com/ http://www.pilotproject.tv/view_finalist.php?id=267 FOR THE PEOPLE = http://www.talkstarradio.com/ FTP = http://www.talkstarradio.com/hosts/chuckpage.htm HOSTS = http://www.talkstarradio.com/hosts/meetourstars.htm whoa - end of ramble ~ RHF . I was thinking more about the floating audio that cannot be grounded. |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
David wrote:
On Thu, 20 Apr 2006 16:09:32 -0500, clifto wrote: Resonance is one of many things that goes into receiving signals, but when you come right down to it the receiver is nothing more than a device which processes the voltage (or current) fed it from an antenna. You use it to select one of many signals (using resonance), amplify the heck out of it and extract the information from the result. What's that got to do with a current flowing to ground? Ohm's Law. When you put a voltage across an impedance, current flows. The voltage induced in a typical antenna is with respect to ground. -- All relevant people are pertinent. All rude people are impertinent. Therefore, no rude people are relevant. -- Solomon W. Golomb |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On Thu, 20 Apr 2006 17:41:31 -0500, clifto wrote:
David wrote: On Thu, 20 Apr 2006 16:09:32 -0500, clifto wrote: Resonance is one of many things that goes into receiving signals, but when you come right down to it the receiver is nothing more than a device which processes the voltage (or current) fed it from an antenna. You use it to select one of many signals (using resonance), amplify the heck out of it and extract the information from the result. What's that got to do with a current flowing to ground? Ohm's Law. When you put a voltage across an impedance, current flows. The voltage induced in a typical antenna is with respect to ground. So, radio doesn't work in outer space? If I had a six transistor radio 50 miles up I couldn't hear Limbaugh? |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
David wrote:
On Thu, 20 Apr 2006 17:41:31 -0500, clifto wrote: David wrote: On Thu, 20 Apr 2006 16:09:32 -0500, clifto wrote: Resonance is one of many things that goes into receiving signals, but when you come right down to it the receiver is nothing more than a device which processes the voltage (or current) fed it from an antenna. You use it to select one of many signals (using resonance), amplify the heck out of it and extract the information from the result. What's that got to do with a current flowing to ground? Ohm's Law. When you put a voltage across an impedance, current flows. The voltage induced in a typical antenna is with respect to ground. So, radio doesn't work in outer space? If I had a six transistor radio 50 miles up I couldn't hear Limbaugh? You know, I've wondered about that, too. The closest to explaining that I've conjured is that the electromagnetic field works up there, but I can't imagine how the electrostatic field from the transmitting antenna could work on a space antenna. But antenna design has always been black magic to me. -- All relevant people are pertinent. All rude people are impertinent. Therefore, no rude people are relevant. -- Solomon W. Golomb |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
David - So are you claiming that 'only' Resonant Current
Flows to ground ? ;-) ~ RHF FWIW - There is a lot of Dipole Antennas out there free floating above ground that must not be working :o) IIRC - The Antenna Input has a characteristic impedance 50, 75, 300, or 500 Ohms. Subsequent to that the internal circuity of the Radio can be Resonated to Select and Amplify an RF Signal and then process it into an Audio Sound that we can Hear. yes it is that simple ~ RHF |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
JHR,
HOW TO - REMOVE THE TIP OF THE 1/8" MONO-PLUG : http://groups.yahoo.com/group/Shortw...a/message/9133 Use two Pairs of Pliers to carefully remove the End-Tip of the body of the 1/8" Mono Plug. Oops - Some people just use a Pair-of-Diks and snip-it-off :-( Next - Ever-so-Gently -squeeze- the Barrel and deform it 'just enough' (into an Oval) to make it a "Pinch-Fit" for the 1/8" Jack. FWIW - If you only have a SO-239 Jack on the back of your Radio or other equipment; and want to connect a simple Insulated Wire feed-in-line form a classic LongWire {Random Wire} Antenna. Then a {1/8"?} Banana Plug will 'fit into' the Center Female Pin of the SO-239 Jack. -Note- Sometimes you have to gently spread the four sections of the Banana Plug Tip to get a Snug-Fit with the Center Female Pin of the SO-239 Jack. Back in the Good Old Days on the Farm the Answer . . . would be Baling Wire :o) http://en.wikipedia.org/wiki/Baling_wire The Modern Day Urban Answers are now things like : a Paper Clip, a Rubber Band and some Duck Tape :o) http://tinyurl.com/mlpty http://www.texasescapes.com/DelbertT...s-Caulking.htm yes it is that simple - iane ~ RHF |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
David - That is True ~ RHF
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Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On Thu, 20 Apr 2006 19:43:18 -0500, clifto wrote:
David wrote: On Thu, 20 Apr 2006 18:09:23 -0500, clifto wrote: You know, I've wondered about that, too. The closest to explaining that I've conjured is that the electromagnetic field works up there, but I can't imagine how the electrostatic field from the transmitting antenna could work on a space antenna. But antenna design has always been black magic to me. Basic Nicola Tesla. Resonance. Has nothing to do with ground or waves travelling through space. An antenna sets up a field by resonating at the frequency of a connected generator. An antenna samples energy from the field in a similar manner and this can be detected. But nonresonant antennas work quite well, probably even in space. Resonant antennas work better, but your explanation doesn't account for the long-wire antenna that works on 19M and 49M too. It's in the field and absorbing energy. The lack of resonance requires more amplification. |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
Telamon wrote:
We have drifted a long way from the topic. Yes, but it's still about radio and you're still complaining ...and who appointed you as a "Net Policeman" anyway? You gonna show us your "steenking bodge"? |
Four Tricks to Try for Better AM {Medium Wave} Radio Reception
BM,
Like most suggestions - This is not a perfect suggestion that works for everyone all the time. This is simply one of those suggestions that if you try it; it just may work for you; this time and the next time it may not do anything or even make things worse. The main idea is to see 'if' by adding a Ground to the un-grounded Radio {Grounding the RF Signal Ground Side of the Radio's internal circuitry} So starting with a low cost 'portable' AM / FM Shortwave Radio with a Plastic Case that does not have an External Antenna Input or an Exposed Ground Connection. FOUR TRICKS TO TRY FOR BETTER AM {MEDIUM WAVE} RECEPTION : http://groups.yahoo.com/group/Shortw...a/message/9137 1. Touch a Finger Tip to the Tip of the Whip Antenna - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands 2. Touch a Finger Tip to Exposed Ring of Earphone Jack. - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands 3. Take a 15-20 Foot piece of Insulated Wire and strip-off an Inch of Insulation from one end and attach the Wire to the Collapsed Whip Antenna. Route the Wire around the Room. - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands Finally we get to the root of this suggestion . . . # 4 4. Take a 3-6 Foot piece of Insulated Wire and strip-off an Inch of Insulation from both ends and attach one end to a ground within the room (Cold Water Pipe?). Make sure that the Radio's Whip Antenna is fully extended. Next "Touch" this Wire to the Exposed Ring of the Radio's Earphone Jack. - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands HEY - Even try Touching this Ground Wire to the Radio's Collapsed Whip Antenna :o) - - - Does the Radio's Reception Improve or get Noiser ? "IF" - When you "Touch" the Wire to the Exposed Ring of the Earphone Jack the Radio's Reception Improves. Then Modify an 1/8" Mono-Plug to put into the Earphone Jack to connect a Ground to the Radio for Improved Reception all the time {most of the time}. READ - Antenna's for AM/MW Reception: http://www.marcspages.co.uk/tech/antmwrec.htm Marc's Technical Pages - by Marc Dekenah Choosing the AM/MW Antenna: - The Short-Low Capacitance; - The Medium Impedance - - Low Impedance Antennas. READ - AM Radio Reception - Tips and Links -by- Rich Lee Bruce http://www.geocities.com/richleebruce/amradio.html READ - How to Get Better AM Radio Reception http://www.geocities.com/SunsetStrip...2/amradio.html -by- The Pilot of the Airwaves http://www.geocities.com/SunsetStrip...332/index.html hope clarifies a few things and helps - iane ~ RHF |
Four Tricks to Try for Better AM {Medium Wave} Radio Reception
In article .com,
"RHF" wrote: BM, Like most suggestions - This is not a perfect suggestion that works for everyone all the time. This is simply one of those suggestions that if you try it; it just may work for you; this time and the next time it may not do anything or even make things worse. The main idea is to see 'if' by adding a Ground to the un-grounded Radio {Grounding the RF Signal Ground Side of the Radio's internal circuitry} So starting with a low cost 'portable' AM / FM Shortwave Radio with a Plastic Case that does not have an External Antenna Input or an Exposed Ground Connection. FOUR TRICKS TO TRY FOR BETTER AM {MEDIUM WAVE} RECEPTION : http://groups.yahoo.com/group/Shortw...a/message/9137 1. Touch a Finger Tip to the Tip of the Whip Antenna - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands 2. Touch a Finger Tip to Exposed Ring of Earphone Jack. - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands 3. Take a 15-20 Foot piece of Insulated Wire and strip-off an Inch of Insulation from one end and attach the Wire to the Collapsed Whip Antenna. Route the Wire around the Room. - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands Finally we get to the root of this suggestion . . . # 4 4. Take a 3-6 Foot piece of Insulated Wire and strip-off an Inch of Insulation from both ends and attach one end to a ground within the room (Cold Water Pipe?). Make sure that the Radio's Whip Antenna is fully extended. Next "Touch" this Wire to the Exposed Ring of the Radio's Earphone Jack. - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands HEY - Even try Touching this Ground Wire to the Radio's Collapsed Whip Antenna :o) - - - Does the Radio's Reception Improve or get Noiser ? "IF" - When you "Touch" the Wire to the Exposed Ring of the Earphone Jack the Radio's Reception Improves. Then Modify an 1/8" Mono-Plug to put into the Earphone Jack to connect a Ground to the Radio for Improved Reception all the time {most of the time}. READ - Antenna's for AM/MW Reception: http://www.marcspages.co.uk/tech/antmwrec.htm Marc's Technical Pages - by Marc Dekenah Choosing the AM/MW Antenna: - The Short-Low Capacitance; - The Medium Impedance - - Low Impedance Antennas. READ - AM Radio Reception - Tips and Links -by- Rich Lee Bruce http://www.geocities.com/richleebruce/amradio.html READ - How to Get Better AM Radio Reception http://www.geocities.com/SunsetStrip...2/amradio.html -by- The Pilot of the Airwaves http://www.geocities.com/SunsetStrip...332/index.html hope clarifies a few things and helps - iane ~ RHF All righty then, I ask why should you care about picking up the ground side? Will this make the reception less noisy? Is it worth the trouble? Theoretically it should help but like all things pertaining to antennas it will depend on the situation at hand. If you connect the radio ground to the other half of a dipole or other Hertzian type antenna it should reduce common mode pickup, which is the main mode of local noise pickup. I'll explain why this is if anyone cares to know. -- Telamon Ventura, California |
Four Tricks to Try for Better AM {Medium Wave} Radio Reception
In article .com,
"RHF" wrote: In article , Telamon wrote: If you connect the radio ground to the other half of a dipole or other Hertzian type antenna it should reduce common mode pickup, which is the main mode of local noise pickup. I'll explain why this is if anyone cares to know. I will take you up on your offer, please enlighten and educate me ~ RHF Snip A portable using a whip antenna or using a single wire extension is a Marconi type, which is a common mode voltage antenna. Locally generated noise is picked up best by this type of antenna. The whip or extension wire picks up common mode energy, generated nearby or from a distance, which travels across the radio input impedance into the radio chassis return. If you hold the radio or if it is plugged into an AC converter supply then you and the mains become part of the RF return. The radio chassis return, you or the mains look like a low impedance path for the RF to go into so the circuit is the one element generating a voltage with the RF current across the radios input impedance into a low impedance ground or return. This is contrasted with a Hertzian balanced antenna where the RF current travels from one element to the other through the radios input impedance. Here locally generated noise tends to couple to both elements more or less equally so a potential voltage difference does not appear across the radios input impedance for the local noise source energy. However, a distant EM waves at 1/2 wavelength of the dipole or smaller will generate a potential voltage between the two elements, which causes RF current to flow through the radios input impedance. This action between local and distant energy on a Hertzian type antenna is situationally dependent but should show a marked improvement over a Marconi type antenna for distant signal to local noise. This improvement is best shown with the portable on batteries so the antenna arrangement is best balanced. Using a AC supply will have a tendency to unbalance the Hertzian antenna. -- Telamon Ventura, California |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On Fri, 21 Apr 2006 02:13:35 GMT, Carter-K8VT
wrote: Telamon wrote: We have drifted a long way from the topic. Yes, but it's still about radio and you're still complaining ...and who appointed you as a "Net Policeman" anyway? You gonna show us your "steenking bodge"? The topic is why should you ground a radio that doesn't want to be grounded. Telemon is uptight. |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
In article .com,
RHF wrote: MZ - Right on both points. ~ RHF Which is why the battery eliminator jack (coaxial power socket) may be a better bet. If it's hooked up so that the center pin is ground, you may be able to get a crimp on terminal (as used in a Molex connector or RS-232 plug) that fits on the center pin without activating the disconnect switch (that's pushed by the outer barrel). A bit of shrink tubing is recommended to keep from shorting the two contacts. (There's no disconnect switch on an FR-200, so I just use a (size N?) plug from Radio Shack). Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
Telamon wrote:
EM waves, radio or light, do not depend on a medium to propagate. We all know there is a medium and is called ETHER. Let's get with it..It IS the nineteenth century, after all... mike |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
David wrote:
On 20 Apr 2006 16:17:57 -0700, "RHF" wrote: David - So are you claiming that 'only' Resonant Current Flows to ground ? ;-) ~ RHF No. The opposite, actually. The antenna will develop maximum signal at it's resonant frequency. This signal energy will then be transfered most efficiently to the radio when the impedance of the antenna is the same as that of the radio. A power generator works the same way..the antenna is just a stationary conductor in a moving field looking for a suitable load to drive. mike |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
RHF wrote:
David - Switched or un-switched the Exposed Outer Ring of the 1/8" Mono Jack used for the Earphone Output is usually the Radio's Electrical Circuit Ground and is also the RF Signal Ground. NOTE - This idea and application is mainly for Radios that do not have a built-in External Antenna Input that offers a Grounding "Attachment" Point for the Radio. My car radio is isolated from ground by four large rubber doughnuts and still manages to outperform most of the in-house am radios, using an obscenely small antenna on top of it all. Your advice would imply that dragging ten or twenty feet of logging chain from the chassis would reduce signal noise, at least on wet days. Is that really a logical conclusion? I'm having problems with your assumptions. mike |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
m II wrote:
Telamon wrote: EM waves, radio or light, do not depend on a medium to propagate. We all know there is a medium and is called ETHER. Everybody knows that. But there is no Ether Bunny. -- All relevant people are pertinent. All rude people are impertinent. Therefore, no rude people are relevant. -- Solomon W. Golomb |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
David,
Until the individual 'portable' AM / FM Shortwave Radio Owner tries - The Four Tricks to Try for Better AM {Medium Wave} Radio Reception - They Don't Know. http://groups.google.com/group/rec.r...227b009aa19478 Until Then - One does not know whether their 'portable' AM / FM Shortwave Radio "Wants" a Ground or an Antenna or both or neither. Sometimes What Works - WORKS ! - "IF" - You Give It A Try ! { Remember 'if' at First You Don't Succeed : try, Try and TRY ! again, Again. and AGAIN ! :o} http://www.bartleby.com/59/3/ifatfirstyou.html http://www.quotedb.com/quotes/1841 http://www.answers.com/topic/if-at-f...-try-try-again overly redundantly yours - iane ~ RHF |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On Thu, 20 Apr 2006 22:46:25 GMT, David wrote:
On Thu, 20 Apr 2006 17:41:31 -0500, clifto wrote: David wrote: On Thu, 20 Apr 2006 16:09:32 -0500, clifto wrote: Resonance is one of many things that goes into receiving signals, but when you come right down to it the receiver is nothing more than a device which processes the voltage (or current) fed it from an antenna. You use it to select one of many signals (using resonance), amplify the heck out of it and extract the information from the result. What's that got to do with a current flowing to ground? Ohm's Law. When you put a voltage across an impedance, current flows. The voltage induced in a typical antenna is with respect to ground. So, radio doesn't work in outer space? If I had a six transistor radio 50 miles up I couldn't hear Limbaugh? You'd use a "loop".... where the second wire simulates a ground. rj |
Four Tricks to Try for Better AM {Medium Wave} Radio Reception
4. Take a 3-6 Foot piece of Insulated Wire and strip-off an Inch of Insulation from both ends and attach one end to a ground within the room (Cold Water Pipe?). Make sure that the Radio's Whip Antenna is fully extended. Next "Touch" this Wire to the Exposed Ring of the Radio's Earphone Jack. - - - Does the Radio's Reception Improve or get Noiser ? Try this on the AM, FM and Shortwave Bands HEY - Even try Touching this Ground Wire to the Radio's Collapsed Whip Antenna :o) - - - Does the Radio's Reception Improve or get Noiser ? "IF" - When you "Touch" the Wire to the Exposed Ring of the Earphone Jack the Radio's Reception Improves. Then Modify an 1/8" Mono-Plug to put into the Earphone Jack to connect a Ground to the Radio for Improved Reception all the time {most of the time}. Easiest "ground" is to use the ground socket on your AC outlet. I find a banana plug fits about right.... rj |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
RJ - "You'd use a 'loop'....
where the second wire simulates a ground." please explain - i am lost in space - iwtk ~ RHF |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On 25 Apr 2006 01:35:57 -0700, "RHF"
wrote: David, Hence the AGC Circuitry in Radios, so that a Strong Signal that is developed by a Resonant Antenna is Averaged 'down' -and- a Weaker Signal that is developed by a the same Antenna at a non-resonant frequency is Averaged 'up' : So that both Signals 'appear' to sound about the same to the ears. NOTE - The Stronger and Weaker Signals are what the Radio receives at the Antenna Input. In reality both Signal are relatively the same strength around the Antenna. * One Signal is at Resonance with respect to the Antenna and therefore the Antenna develops a greater signal "A Stronger Signal" that is sent to the Radio's Input. * The 'other' Signal is Not at Resonance with respect to the Antenna and therefore the Antenna develpos a lessor signal "A Weaker Signal" that is sent to the Radio's Input. and that is why the proper antenna is important to good radio reception - iane ~ RHF . You're going to explain circuitry to me? HAH! |
Modified 1/8" Mono Plug for a 'portable' Radio's Ground Connection
On 25 Apr 2006 01:38:53 -0700, "RHF"
wrote: RJ - "You'd use a 'loop'.... where the second wire simulates a ground." please explain - i am lost in space - iwtk ~ RHF . . A loop works by the priciple of a magnet moving past a coil. No ground required. |
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