K3 VLF Mod Trials, Tribulations and My Results
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K3 VLF Mod Trials, Tribulations and My Results
 
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As most of you know, a couple days ago, Wayne talked about a mod to
improve the VLF sensitivity of the K3 after the KSYN3A synthesizer installation. I volunteered and he sent me the information on what parts were needed and where they went. After finding out that I didn't have the right parts in my stock I went looking. Wound up ordering them from Mouser with a delivery date of this coming Tuesday. Being the impatient type that I am, I went looking. We have a local (former) Radio Shack franchisee that is also our area ham radio store. I finally called him and found out that he did indeed have some surface mount capacitors of the necessary value and also the electrolytic caps that I was out of. Parts in hand, I proceeded to open up the K3. Since mine was a factory built one, though I'd done some repair and installation of the KSYN3A synthesizers, I hadn't had it disassembled to the points necessary to do the mods before. Having worked on many unfamiliar radios in my US Army and Commercial 2-Way Radio careers, I jumped right in (read the book later, sort of). It was necessary to remove the KRX3 sub receiver and the KBPF3 General Coverage Bandpass Filter in order to perform the modifications. If you have the KSYN3A synthesizers and want to do the mods, you'll have to get them from Wayne though. He gave me permission to post my experiences & results, but not the total details of the mods. Prior to doing anything a "before" MDS (minimum discernable signal) test was requested on several of the VLF frequencies (137 KHz and 472 KHz) requiring a calibrated signal generator that will output -107dBm signals on those frequencies. Mine would not so I used a 0 to 69 db precision step attenuator to take the output down from -73 dBm (50 microvolts) to the required -107. Prior to the modifications, the MDS for those frequencies in MY K3 (your results will most certainly vary a bit) were 137 KHz, MDS -82 dBm and 472 KHz -98 dBm somewhere close to what it was determined it should be. After completing the modifications which consist of adding a couple of components on the main RF board, removing a couple of inductors and replacing 3 surface mount capacitors on the KBPF3, as I was reassembling the radio, I had all but completed the job when I accidentally dropped one of the screws and washers used to hold the stiffener bar to the PA shield. It IS necessary to remove this if you have a KRX3 sub receiver in order to get the KRX3 out. That errant screw dropped down into the guts of the K3. When I turned it upside down and shook it, nothing appeared to come out and I didn't hear it rattling around either. Scary stuff, I had to completely disassemble things again, including the PA which was over the area the screw & washer fell into. Still finding nothing, I was really worried now so I got up to get a bigger flashlight to help search. As I stood up, the screw and washer fell out of my lap. Much ado about nothing, but I sure as heck didn't want to reassemble the K3 and have a screw floating around on top of the main RF board. Word to the wise, if you do the mods, keep CAREFUL track of all screws, washers and other parts so they don't drop where they shouldn't and you won't have to do what I did. Fortunately, after the scare, everything went back in place and everything worked when I re-connected things and powered it up. Again, it was requested to do an "after" MDS on those two frequencies and the results (on MY K3, serial# 5027) are as follows with 2 additional freq's in the range added. 137 KHz - Wayne got -114 dBm on the lab K3, I got -116 dBm on mine. 160 KHz - Wayne got -117 dBm, I got -119. 250 KHz - Wayne got -126 dBm, I got -125. 472 KHz - Wayne got -133 dBm and I got -132. These are well within the tolerances of my personal test equipment (Sig gen was a SARK-110 Vector Impedance Analyzer containing a nicely calibrated signal generator that goes from 1.0 KHz through 230 MHz but minimum output is -73 dBm so I used a recently calibrated Telonic precision step attenuator to get it down to the necessary -107 dBm called out in Wayne's MDS measurement procedure. This morning, I hooked up my short PAR EndFedZ 40-20-10 meter QRP antenna which is strung up just above the house roof - far end 30 feet high near end/feedpoint 15 feet high with about 20 feet of RG-58 to the radio and tuned around the Aircraft Beacon band from 250 KHz through about 420 KHz and heard the following stations well after sunup when the noise level on those frequencies is quite a bit higher than during the night time. Heard on VLF this morning well after sun up - 8:30-9:00 Central Daylight Time in Park City (Wichita area), KS. Freq, Identifier, Location and approximate Distance from my QTH 332KHz IC Wichita KS 12 miles 350KHz RG Oklahoma City, OK 141 nautical miles 356KHz PTT Pratt, KS 68 nautical miles 375KHz DW Tulsa, OK 117.5 nautical miles 395KHz CA Newton, KS 15 nautical miles 407KHz HRU Herrington, KS 58.8 nautical miles 414KHz EGT Wellington, KS 28.8 nautical miles It looks like the modifications really do improve the receive sensitivity immensely on these frequencies. I tried listening for some of these beacons after installing the new synthesizers, but could only hear the Wichita and Newton beacons which are quite close to me. Jim Sheldon, W0EB ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: K3 VLF Mod Trials, Tribulations and My Results
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Hmmmm now the dilemma. Who wants to rip their radio apart to install the new KSYN3A pair just to rip it apart again to install these mods? I think ill wait until both are available.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email: [hidden email] > On May 3, 2015, at 10:44 AM, Jim Sheldon <[hidden email]> wrote: > > As most of you know, a couple days ago, Wayne talked about a mod to improve the VLF sensitivity of the K3 after the KSYN3A synthesizer installation. I volunteered and he sent me the information on what parts were needed and where they went. After finding out that I didn't have the right parts in my stock I went looking. Wound up ordering them from Mouser with a delivery date of this coming Tuesday. Being the impatient type that I am, I went looking. We have a local (former) Radio Shack franchisee that is also our area ham radio store. I finally called him and found out that he did indeed have some surface mount capacitors of the necessary value and also the electrolytic caps that I was out of. > > Parts in hand, I proceeded to open up the K3. Since mine was a factory built one, though I'd done some repair and installation of the KSYN3A synthesizers, I hadn't had it disassembled to the points necessary to do the mods before. Having worked on many unfamiliar radios in my US Army and Commercial 2-Way Radio careers, I jumped right in (read the book later, sort of). It was necessary to remove the KRX3 sub receiver and the KBPF3 General Coverage Bandpass Filter in order to perform the modifications. If you have the KSYN3A synthesizers and want to do the mods, you'll have to get them from Wayne though. He gave me permission to post my experiences & results, but not the total details of the mods. > > Prior to doing anything a "before" MDS (minimum discernable signal) test was requested on several of the VLF frequencies (137 KHz and 472 KHz) requiring a calibrated signal generator that will output -107dBm signals on those frequencies. Mine would not so I used a 0 to 69 db precision step attenuator to take the output down from -73 dBm (50 microvolts) to the required -107. > > Prior to the modifications, the MDS for those frequencies in MY K3 (your results will most certainly vary a bit) were 137 KHz, MDS -82 dBm and 472 KHz -98 dBm somewhere close to what it was determined it should be. > > After completing the modifications which consist of adding a couple of components on the main RF board, removing a couple of inductors and replacing 3 surface mount capacitors on the KBPF3, as I was reassembling the radio, I had all but completed the job when I accidentally dropped one of the screws and washers used to hold the stiffener bar to the PA shield. It IS necessary to remove this if you have a KRX3 sub receiver in order to get the KRX3 out. That errant screw dropped down into the guts of the K3. When I turned it upside down and shook it, nothing appeared to come out and I didn't hear it rattling around either. Scary stuff, I had to completely disassemble things again, including the PA which was over the area the screw & washer fell into. Still finding nothing, I was really worried now so I got up to get a bigger flashlight to help search. As I stood up, the screw and washer fell out of my lap. Much ado about nothing, but I sure as heck didn't want to reassemble the K3 and have a screw floating around on top of the main RF board. Word to the wise, if you do the mods, keep CAREFUL track of all screws, washers and other parts so they don't drop where they shouldn't and you won't have to do what I did. > > Fortunately, after the scare, everything went back in place and everything worked when I re-connected things and powered it up. > > Again, it was requested to do an "after" MDS on those two frequencies and the results (on MY K3, serial# 5027) are as follows with 2 additional freq's in the range added. > > 137 KHz - Wayne got -114 dBm on the lab K3, I got -116 dBm on mine. > 160 KHz - Wayne got -117 dBm, I got -119. > 250 KHz - Wayne got -126 dBm, I got -125. > 472 KHz - Wayne got -133 dBm and I got -132. > > These are well within the tolerances of my personal test equipment (Sig gen was a SARK-110 Vector Impedance Analyzer containing a nicely calibrated signal generator that goes from 1.0 KHz through 230 MHz but minimum output is -73 dBm so I used a recently calibrated Telonic precision step attenuator to get it down to the necessary -107 dBm called out in Wayne's MDS measurement procedure. > > This morning, I hooked up my short PAR EndFedZ 40-20-10 meter QRP antenna which is strung up just above the house roof - far end 30 feet high near end/feedpoint 15 feet high with about 20 feet of RG-58 to the radio and tuned around the Aircraft Beacon band from 250 KHz through about 420 KHz and heard the following stations well after sunup when the noise level on those frequencies is quite a bit higher than during the night time. > > Heard on VLF this morning well after sun up - 8:30-9:00 Central Daylight Time in Park City (Wichita area), KS. > > Freq, Identifier, Location and approximate Distance from my QTH > 332KHz IC Wichita KS 12 miles > 350KHz RG Oklahoma City, OK 141 nautical miles > 356KHz PTT Pratt, KS 68 nautical miles > 375KHz DW Tulsa, OK 117.5 nautical miles > 395KHz CA Newton, KS 15 nautical miles > 407KHz HRU Herrington, KS 58.8 nautical miles > 414KHz EGT Wellington, KS 28.8 nautical miles > > It looks like the modifications really do improve the receive sensitivity immensely on these frequencies. I tried listening for some of these beacons after installing the new synthesizers, but could only hear the Wichita and Newton beacons which are quite close to me. > > Jim Sheldon, W0EB > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: K3 VLF Mod Trials, Tribulations and My Results
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The new synthesizers only require removing the top cover, taking 2
screws out of each synthesizer board and exchanging a few cables (easily reached). That is not what I would call "rip their radio apart". I would certainly advocate changing the synth boards when they arrive. The mod to the KBPFL3 is only preliminary and it may be a while before it is available. 73, Don W3FPR On 5/3/2015 2:16 PM, Dr. William J. Schmidt, II wrote: > Hmmmm now the dilemma. Who wants to rip their radio apart to install the new KSYN3A pair just to rip it apart again to install these mods? I think ill wait until both are available. > > > Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ > > Owner - Operator > Big Signal Ranch – K9ZC > Staunton, Illinois > > Owner – Operator > Villa Grand Piton - J68HZ > Soufriere, St. Lucia W.I. > Rent it: www.VillaGrandPiton.com > > email: [hidden email] > > >> On May 3, 2015, at 10:44 AM, Jim Sheldon <[hidden email]> wrote: >> >> As most of you know, a couple days ago, Wayne talked about a mod to improve the VLF sensitivity of the K3 after the KSYN3A synthesizer installation. I volunteered and he sent me the information on what parts were needed and where they went. After finding out that I didn't have the right parts in my stock I went looking. Wound up ordering them from Mouser with a delivery date of this coming Tuesday. Being the impatient type that I am, I went looking. We have a local (former) Radio Shack franchisee that is also our area ham radio store. I finally called him and found out that he did indeed have some surface mount capacitors of the necessary value and also the electrolytic caps that I was out of. >> >> Parts in hand, I proceeded to open up the K3. Since mine was a factory built one, though I'd done some repair and installation of the KSYN3A synthesizers, I hadn't had it disassembled to the points necessary to do the mods before. Having worked on many unfamiliar radios in my US Army and Commercial 2-Way Radio careers, I jumped right in (read the book later, sort of). It was necessary to remove the KRX3 sub receiver and the KBPF3 General Coverage Bandpass Filter in order to perform the modifications. If you have the KSYN3A synthesizers and want to do the mods, you'll have to get them from Wayne though. He gave me permission to post my experiences & results, but not the total details of the mods. >> >> Prior to doing anything a "before" MDS (minimum discernable signal) test was requested on several of the VLF frequencies (137 KHz and 472 KHz) requiring a calibrated signal generator that will output -107dBm signals on those frequencies. Mine would not so I used a 0 to 69 db precision step attenuator to take the output down from -73 dBm (50 microvolts) to the required -107. >> >> Prior to the modifications, the MDS for those frequencies in MY K3 (your results will most certainly vary a bit) were 137 KHz, MDS -82 dBm and 472 KHz -98 dBm somewhere close to what it was determined it should be. >> >> After completing the modifications which consist of adding a couple of components on the main RF board, removing a couple of inductors and replacing 3 surface mount capacitors on the KBPF3, as I was reassembling the radio, I had all but completed the job when I accidentally dropped one of the screws and washers used to hold the stiffener bar to the PA shield. It IS necessary to remove this if you have a KRX3 sub receiver in order to get the KRX3 out. That errant screw dropped down into the guts of the K3. When I turned it upside down and shook it, nothing appeared to come out and I didn't hear it rattling around either. Scary stuff, I had to completely disassemble things again, including the PA which was over the area the screw & washer fell into. Still finding nothing, I was really worried now so I got up to get a bigger flashlight to help search. As I stood up, the screw and washer fell out of my lap. Much ado about nothing, but I sure as heck didn't want to reassemble the K3 and have a screw floating around on top of the main RF board. Word to the wise, if you do the mods, keep CAREFUL track of all screws, washers and other parts so they don't drop where they shouldn't and you won't have to do what I did. >> >> Fortunately, after the scare, everything went back in place and everything worked when I re-connected things and powered it up. >> >> Again, it was requested to do an "after" MDS on those two frequencies and the results (on MY K3, serial# 5027) are as follows with 2 additional freq's in the range added. >> >> 137 KHz - Wayne got -114 dBm on the lab K3, I got -116 dBm on mine. >> 160 KHz - Wayne got -117 dBm, I got -119. >> 250 KHz - Wayne got -126 dBm, I got -125. >> 472 KHz - Wayne got -133 dBm and I got -132. >> >> These are well within the tolerances of my personal test equipment (Sig gen was a SARK-110 Vector Impedance Analyzer containing a nicely calibrated signal generator that goes from 1.0 KHz through 230 MHz but minimum output is -73 dBm so I used a recently calibrated Telonic precision step attenuator to get it down to the necessary -107 dBm called out in Wayne's MDS measurement procedure. >> >> This morning, I hooked up my short PAR EndFedZ 40-20-10 meter QRP antenna which is strung up just above the house roof - far end 30 feet high near end/feedpoint 15 feet high with about 20 feet of RG-58 to the radio and tuned around the Aircraft Beacon band from 250 KHz through about 420 KHz and heard the following stations well after sunup when the noise level on those frequencies is quite a bit higher than during the night time. >> >> Heard on VLF this morning well after sun up - 8:30-9:00 Central Daylight Time in Park City (Wichita area), KS. >> >> Freq, Identifier, Location and approximate Distance from my QTH >> 332KHz IC Wichita KS 12 miles >> 350KHz RG Oklahoma City, OK 141 nautical miles >> 356KHz PTT Pratt, KS 68 nautical miles >> 375KHz DW Tulsa, OK 117.5 nautical miles >> 395KHz CA Newton, KS 15 nautical miles >> 407KHz HRU Herrington, KS 58.8 nautical miles >> 414KHz EGT Wellington, KS 28.8 nautical miles >> >> It looks like the modifications really do improve the receive sensitivity immensely on these frequencies. I tried listening for some of these beacons after installing the new synthesizers, but could only hear the Wichita and Newton beacons which are quite close to me. >> >> Jim Sheldon, W0EB >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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The synthesizer [1, I don't have the sub-Rx] installation took me 30
mins, 10 of which were spent looking for a top cover screw I dropped onto the dark carpet. If by "rip your radio apart", Dr. Schmidt is referring to the "wireless mess" behind the radio, that took a bit longer but only because I cleaned it up and got a lot of unused coax jumpers out in the process ... and labeled connectors on cables. Waiting for the KBPFL3 and doing it together is fine too. It's just not a big job and there was no "ripping" involved. :-) 73, Fred K6DGW - Northern California Contest Club - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015 - www.cqp.org On 5/3/2015 11:24 AM, Don Wilhelm wrote: > The new synthesizers only require removing the top cover, taking 2 > screws out of each synthesizer board and exchanging a few cables (easily > reached). That is not what I would call "rip their radio apart". > I would certainly advocate changing the synth boards when they arrive. > The mod to the KBPFL3 is only preliminary and it may be a while before > it is available. > > 73, > Don W3FPR > > On 5/3/2015 2:16 PM, Dr. William J. Schmidt, II wrote: >> Hmmmm now the dilemma. Who wants to rip their radio apart to install >> the new KSYN3A pair just to rip it apart again to install these mods? >> I think ill wait until both are available. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: K3 VLF Mod Trials, Tribulations and My Results
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In reply to this post by Jim Sheldon
Thanks for the update
I've been swamped and have not had a chance to even order the parts From: Jim Sheldon <[hidden email]> To: Elecraft Mailing List <[hidden email]> Sent: Sunday, May 3, 2015 11:44 AM Subject: [Elecraft] K3 VLF Mod Trials, Tribulations and My Results As most of you know, a couple days ago, Wayne talked about a mod to improve the VLF sensitivity of the K3 after the KSYN3A synthesizer installation. I volunteered and he sent me the information on what parts were needed and where they went. After finding out that I didn't have the right parts in my stock I went looking. Wound up ordering them from Mouser with a delivery date of this coming Tuesday. Being the impatient type that I am, I went looking. We have a local (former) Radio Shack franchisee that is also our area ham radio store. I finally called him and found out that he did indeed have some surface mount capacitors of the necessary value and also the electrolytic caps that I was out of. Parts in hand, I proceeded to open up the K3. Since mine was a factory built one, though I'd done some repair and installation of the KSYN3A synthesizers, I hadn't had it disassembled to the points necessary to do the mods before. Having worked on many unfamiliar radios in my US Army and Commercial 2-Way Radio careers, I jumped right in (read the book later, sort of). It was necessary to remove the KRX3 sub receiver and the KBPF3 General Coverage Bandpass Filter in order to perform the modifications. If you have the KSYN3A synthesizers and want to do the mods, you'll have to get them from Wayne though. He gave me permission to post my experiences & results, but not the total details of the mods. Prior to doing anything a "before" MDS (minimum discernable signal) test was requested on several of the VLF frequencies (137 KHz and 472 KHz) requiring a calibrated signal generator that will output -107dBm signals on those frequencies. Mine would not so I used a 0 to 69 db precision step attenuator to take the output down from -73 dBm (50 microvolts) to the required -107. Prior to the modifications, the MDS for those frequencies in MY K3 (your results will most certainly vary a bit) were 137 KHz, MDS -82 dBm and 472 KHz -98 dBm somewhere close to what it was determined it should be. After completing the modifications which consist of adding a couple of components on the main RF board, removing a couple of inductors and replacing 3 surface mount capacitors on the KBPF3, as I was reassembling the radio, I had all but completed the job when I accidentally dropped one of the screws and washers used to hold the stiffener bar to the PA shield. It IS necessary to remove this if you have a KRX3 sub receiver in order to get the KRX3 out. That errant screw dropped down into the guts of the K3. When I turned it upside down and shook it, nothing appeared to come out and I didn't hear it rattling around either. Scary stuff, I had to completely disassemble things again, including the PA which was over the area the screw & washer fell into. Still finding nothing, I was really worried now so I got up to get a bigger flashlight to help search. As I stood up, the screw and washer fell out of my lap. Much ado about nothing, but I sure as heck didn't want to reassemble the K3 and have a screw floating around on top of the main RF board. Word to the wise, if you do the mods, keep CAREFUL track of all screws, washers and other parts so they don't drop where they shouldn't and you won't have to do what I did. Fortunately, after the scare, everything went back in place and everything worked when I re-connected things and powered it up. Again, it was requested to do an "after" MDS on those two frequencies and the results (on MY K3, serial# 5027) are as follows with 2 additional freq's in the range added. 137 KHz - Wayne got -114 dBm on the lab K3, I got -116 dBm on mine. 160 KHz - Wayne got -117 dBm, I got -119. 250 KHz - Wayne got -126 dBm, I got -125. 472 KHz - Wayne got -133 dBm and I got -132. These are well within the tolerances of my personal test equipment (Sig gen was a SARK-110 Vector Impedance Analyzer containing a nicely calibrated signal generator that goes from 1.0 KHz through 230 MHz but minimum output is -73 dBm so I used a recently calibrated Telonic precision step attenuator to get it down to the necessary -107 dBm called out in Wayne's MDS measurement procedure. This morning, I hooked up my short PAR EndFedZ 40-20-10 meter QRP antenna which is strung up just above the house roof - far end 30 feet high near end/feedpoint 15 feet high with about 20 feet of RG-58 to the radio and tuned around the Aircraft Beacon band from 250 KHz through about 420 KHz and heard the following stations well after sunup when the noise level on those frequencies is quite a bit higher than during the night time. Heard on VLF this morning well after sun up - 8:30-9:00 Central Daylight Time in Park City (Wichita area), KS. Freq, Identifier, Location and approximate Distance from my QTH 332KHz IC Wichita KS 12 miles 350KHz RG Oklahoma City, OK 141 nautical miles 356KHz PTT Pratt, KS 68 nautical miles 375KHz DW Tulsa, OK 117.5 nautical miles 395KHz CA Newton, KS 15 nautical miles 407KHz HRU Herrington, KS 58.8 nautical miles 414KHz EGT Wellington, KS 28.8 nautical miles It looks like the modifications really do improve the receive sensitivity immensely on these frequencies. I tried listening for some of these beacons after installing the new synthesizers, but could only hear the Wichita and Newton beacons which are quite close to me. Jim Sheldon, W0EB ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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