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  • K6CPO's Avatar
    Yesterday, 21:15
    Just keep in mind the old adage "You get what you pay for..."
    1 replies | 47 view(s)
  • jmsolf's Avatar
    Yesterday, 19:20
    Hello everyone I’m looking for a tutor in the Kansas City or liberty Missouri area. I’ve been a ham operator for many years and have forgotten everything I’ve ever learned. I have a Alinco DR-110 and a Kenwood TS-450S but haven’t a clue how to operate them anymore. If anyone would care to help this aging ham how to figure this out I would certainly appreciate it thank you. Oh crap. One more thing, my license has expired. I just wanna be a General Class again.
    0 replies | 64 view(s)
  • DougT's Avatar
    Yesterday, 16:10
    I have a new Yaesu FT-70DR. I have not found any way to use Chirp to program the radio. I would like to use Chirp, since I like Linux a lot more than Windows.
    1 replies | 47 view(s)
  • Steffen_W's Avatar
    Tue 12th Feb 2019, 09:43
    Hi Ibtissam, first of all, thanks again for your help. If I switch 57 9600bps Mode OFF, the communication doesn't work correct, even with the audio connection from pc soundcard. 63 USB2/DATA1 Func can only be set to or , but not to So I cannot try your suggested settings. Best regards
    9 replies | 2622 view(s)
  • Paul1's Avatar
    Mon 11th Feb 2019, 19:52
    Paul1 started a thread Base Radios FT 450 AT in Yaesu
    Hi guys I would like to know if there is any chance that the radio catport could be accidentally switched off, maybe by a crash. The radio has lost contact with my contest program, N1MM and I can't reset the radio. I have eliminated the comport of the PC and also the catlead. so that leaves either the radio catport output or a config error. I have been using N1MM classic for years and am sure the config is correct. I have tried N1mm classic and also N1MM+ and N1mm site isn't much help, so please any suggestions? Thank you 73 Paul/M0SEV
    0 replies | 92 view(s)
  • KC3KSB's Avatar
    Sun 10th Feb 2019, 21:58
    KC3KSB replied to a thread Handheld Radios FT-70 Select Memory Bank to Scan in Yaesu
    I got it working. The file I sent to the radio had memory channels in banks 1, 2, and 3. Here is what I had to do...in memory mode (normal memory mode, not memory bank) select a random memory, press and hold V/M key. "F" blinks in display. Rotate the dial to a bank that you don't have memories registered to. Press the V/M key to save. Now, while in memory mode, pressing "band" switches between all memories and memory bank mode. Memory mode displays "memory" for a moment, memory bank mode will display the "bank number/name" for a moment. In memory bank mode, press "F" then "band", now use the knob to select what bank you want, then press "band". Pressing "F" then "scan will scan just the bank previously selected.
    8 replies | 1450 view(s)
  • brandon lind's Avatar
    Sun 10th Feb 2019, 20:46
    That's interesting. It reminds me of Hellscriber. In "hell", each letter is composed of an 8x5 grid of blocks that are either black or white. The presence or lack of a carrier at a given time sets the blocks black or white. As far as I can tell, it goes from top down and left to right in an 8x5 grid. "Slow hell" is slow enough to hear that, given "1" is signal and "0" is no signal, "11000011 00100100 00011000 00100100 11000011" would print "X". A photo in gray scale could be sent in the same manner by increasing the number of blocks to 800x600 and changing number of bits per color to represent levels of gray. But your idea is different from that... you want to go over each of the 800x600 blocks with one bit several times to selectively increment the black content. Its a good idea and may spread out and lessen the contrast of errors. However, in the first paragraph, 800x600 positions at 7 bits of data per position (for 2^7=128bit gray scale), comes to 800x600x7 = 3,360,000 bits of data to transfer the...
    3 replies | 425 view(s)
  • K6CPO's Avatar
    Sun 10th Feb 2019, 20:36
    K6CPO replied to a thread Handheld Radios FT-70 Select Memory Bank to Scan in Yaesu
    My suggestion is to get rid of ADMS-10 and buy the RT Systems programming (and cable) for the radio. Yaesu programming software is notoriously bad and very limited compared to the RT Systems product. I did this with my very first Yaesu HT and I haven't looked back...
    8 replies | 1450 view(s)
  • KC3KSB's Avatar
    Sun 10th Feb 2019, 19:46
    KC3KSB replied to a thread Handheld Radios FT-70 Select Memory Bank to Scan in Yaesu
    I know this thread is old. I had resolved the issue, and was able to scan one bank at a time. My radio was reset while using ADMS-10. I sent the file I had stored on the computer to the radio. The information is back on the radio, but now it is back to scanning all the memories, and I again can't get it ti scan just one bank. In fact it says "no bank" again, even though I manually registered memory channels to banks, which fixed it the first time around.
    8 replies | 1450 view(s)
  • hjeleas's Avatar
    Fri 8th Feb 2019, 18:45
    Hi, Thanks for the respons. Yes, I'm proposing a new communication mode to send images. I'm thinking of a mode like SSTV. As there are N^2 patterns and an equal number of observations needed to completely encode an NxN image, you'll need a lot of carriers ; Basically, the mode encodes N*N linear equations on the spectrum for an NxN image. It is possible to spread the equations over time, to achieve a slower version with lower bandwidth. I think we need to assign a frequency, a number, to a Hadamard pattern.
    3 replies | 425 view(s)
  • brandon lind's Avatar
    Fri 8th Feb 2019, 00:05
    This article is a good one. It gets right into the theory and math. 6 pages. http://bcpink.com/KB3IFH/files/Download/Gamma%20Match%20article.pdf
    1 replies | 148 view(s)
  • KJ6UQQ's Avatar
    Thu 7th Feb 2019, 05:27
    I am in the process of building a dual band handheld yagi for satellite contacts. I have a question, how far away from the driven element should the gamma match be? Like the distance between the two parallel rods? Sent from my moto x4 using Tapatalk
    1 replies | 148 view(s)
  • KM4COF's Avatar
    Wed 6th Feb 2019, 20:09
    Thank you essbee. HF is on my horizon.
    2 replies | 173 view(s)
  • essbee's Avatar
    Wed 6th Feb 2019, 20:01
    Hello from Lynchburg, VA - not so far from you. I want to welcome you to the forums. You have quite a background in comms. I enjoy 2M/440, and also HF. Sent from my SM-G950U using Tapatalk
    2 replies | 173 view(s)
  • 5B4AJB's Avatar
    Wed 6th Feb 2019, 18:04
    That's pretty much your only constraint - I've made a few of these antenna and they all worked great (to a degree). They're performance is similar to a dipole but with far less noise. Bear in mind, if you put 100W into it your capacitor should be rated for about 10kV so mount it out of reach of children & animals. Performance at ground level is pretty good, although I used a 1.5m diameter one just sitting on the carpet on the first floor (worked all continents). Anyway, try to find a nice big variable capacitor and make up a remote tuning device with lots of gear reduction...
    3 replies | 171 view(s)
  • Jon Hudson's Avatar
    Wed 6th Feb 2019, 16:44
    We sometimes want to set up virtual COM ports to allow synchronization between SDRuno and other logging or decoding software. Here we show how to set this up using the free software com0com. Sourceforge link for com0com: https://sourceforge.net/projects/com0com/ This is one of many video guides from SDRplay - makers of the RSP family of SDR radios. See the full list of SDRplay videos and applications documents on: https://www.sdrplay.com/apps-catalogue/
    0 replies | 151 view(s)
  • Jon Hudson's Avatar
    Wed 6th Feb 2019, 16:39
    In this new video from SDRplay, we show how to use an RSP SDR receiver to compare performance between different antennas. Although primarily intended to illustrate the technique to perform this comparison, after all many factors affect the performance such as location, implementation, local noise sources etc., we were able to suggest an antenna combination that performs well over many bands: https://youtu.be/91fCXPQnlTc
    0 replies | 126 view(s)
  • arcone's Avatar
    Wed 6th Feb 2019, 15:05
    In my case I would like to know how long the heliax is to rf. For one it will be for single band use and I don't think I require a tuning capacitor of any great value, so I can use a simple wide spaced one, home made. Secondly, I would like for the coupling loop to be around the 1/5th of the main loop. I've got a feeling that the heliax needs to be cut a fair bit shorter, I mean when you look at the corrugations closely, the outside length must be far greater than straight pipe. I am surprised that there is no mention of this anywhere with quite a few builds using heliax and the like, but I suppose most of these are multi band and they are utilising larger tuning caps. I want to keep mine as simple as possible for single band which may also help with the efficiency. Jeremy.
    3 replies | 171 view(s)
  • 5B4AJB's Avatar
    Wed 6th Feb 2019, 10:26
    It won't matter, the tuning capacitor will handle the tiny mismatch...
    3 replies | 171 view(s)
  • arcone's Avatar
    Tue 5th Feb 2019, 22:59
    Make sure you have those radials on it when you tune it in the backyard. And surrounding objects, especially metallic, can alter your swr readings, but then again there are the surroundings where it will be mounted on your roof and height above ground that may change things up. So you may find yourself taking it down again if you’re fussy about swr.
    6 replies | 318 view(s)
  • M6YTB's Avatar
    Tue 5th Feb 2019, 22:40
    Thanks, wow few to consider there!
    5 replies | 194 view(s)
  • M6YTB's Avatar
    Tue 5th Feb 2019, 22:39
    Thanks Phil, just Googled such a project and looks useful to the shack too.
    5 replies | 194 view(s)
  • M6YTB's Avatar
    Tue 5th Feb 2019, 22:26
    Thanks for the pointers.
    5 replies | 189 view(s)
  • M6YTB's Avatar
    Tue 5th Feb 2019, 22:21
    Hi thanks, certainly is the plan, course has an exam date for mid May. Maybe look to going Full in 2020 on new syllabus.
    2 replies | 142 view(s)
  • arcone's Avatar
    Tue 5th Feb 2019, 21:11
    I wish to make a magnetic loop antenna with 1/2” heliax and it occurred to me that because the outer conductor is corrugated, this will be longer to rf. Does anyone know how much this lengthening effect is with this coax? I have studied the data sheets and combed the internet with no definitive answer.
    3 replies | 171 view(s)
  • KM4COF's Avatar
    Tue 5th Feb 2019, 14:52
    Greetings all, KN4COF here, from Dinwiddie, Va. I've had my technician ticket for a couple of years now but really haven't done much with it. Been tied up with buying a new place, getting remarried and moving. Even bought a new truck and need to get my mobile rig resituated. Time to settle down and get back into things now. I have used radios all my life, since I was 14, for work, EMS, SAR, and the military. A friend, at my office, kept after me to get my license and get into amatuer radio. So far I have stayed on 2 meter/440 but I shall expand in the future. Anywho, that's me, I look forward to getting to know some folks on here and learning a bit. Thanks
    2 replies | 173 view(s)
  • WZ7U's Avatar
    Mon 4th Feb 2019, 20:58
    Be careful running a mkII (or any 706) into high swr for any amount of time. While true that it should fold back power, those finals are not available as replacements unless you cannibalize another rig. A manual tuner is almost a necessity for multi band operation IMO. Experiment & enjoy!
    5 replies | 189 view(s)
  • K7KBN's Avatar
    Mon 4th Feb 2019, 20:36
    Experiment! Marconi didn't have any antenna reference books; nor did he have the Internet. He did pretty well. Try a dipole cut for one band (where you are licensed to operate). Take lots of time and lots of notes
    5 replies | 189 view(s)
  • brandon lind's Avatar
    Mon 4th Feb 2019, 15:50
    Gate dip oscillator, sinad meter, diode ring mixer, UHF swr meter, function generator, RF field strength meter, rubber ducky direction finder, three-voltmeter impedance measurement setup, TDR pulse generator, avalanche oscillator... I have been wanting to try a Lecher Line with LED sliders instead of Geissler tubes.
    5 replies | 194 view(s)
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