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  • 5B4AJB's Avatar
    Today, 04:58
    pretty much everyone?
    7 replies | 86 view(s)
  • 5B4AJB's Avatar
    Today, 04:16
    Nope :p Multi-band antennas are a compromise at best and even single-band antennas are usually resonant at one frequency. Most of the signal a really good VHF/UHF antenna collects is wasted by poor coax. A decent run of Heliax or H100 (or similar) might cost as much as the whole station, but is worth it. Get your discone up as high as possible and feed it with some nice coax, then you'll start pulling in signals...
    2 replies | 78 view(s)
  • 5B4AJB's Avatar
    Today, 04:13
    You can figure out the approximate value by measurement (dimensions). Its been many years since I was at college, but its a function of the total surface area of the plates and the distance between them. Try this calculator. Be aware that they usually have a minimum capacitance too, so, it may have the range of 20-100pF
    2 replies | 46 view(s)
  • FlyGuy's Avatar
    Today, 00:25
    Well, as a private pilot, most of the flying I do is just for fun. I figured I'd take a mobile up, and just see if I can make any contacts. If I don't, so be it. If I do, well then I think that's pretty cool.
    7 replies | 86 view(s)
  • K7KBN's Avatar
    Yesterday, 22:42
    Connect it to a capacitance meter (and subtract the capacitance of the meter leads).
    2 replies | 46 view(s)
  • DCBUS's Avatar
    Yesterday, 18:17
    Hello, Can someone please help me identify this variable capacitor. I do not see any brand or model on the unit? It is 9" wide x 7" deep x 6" tall. Thank you
    2 replies | 46 view(s)
  • paulears's Avatar
    Yesterday, 18:17
    paulears replied to a thread Tuning in Yaesu
    Seems odd to ask a question, get decent answers that clearly have been a bit misunderstood then walk away, with the wrong explanation in your head. The radio never presents a 50 ohm source to the outside world if that antenna is anything other than 50 Ohms - it does it's job by converting one impedance into another, maximising efficiency. one end of an antenna tuner is designed to be 50Ohms, and the other can be whatever is needed.
    13 replies | 427 view(s)
  • Sixmeters's Avatar
    Yesterday, 16:34
    Who are you going to talk to? I can hear 40+ repeaters at my QTH, and yet not hear much if anything all day long, except the repeater identify from time to time unless there is a net... Would be a perfectly good waste of airplane fuel to fly just for the purpose of wanting to play FM.... Maybe if you tried VHF SSB during a contest you could find people to work, but then you would have to sign aeronautical mobile, and i don't know how it would count for grids and stuff...
    7 replies | 86 view(s)
  • Sixmeters's Avatar
    Yesterday, 16:31
    Sixmeters replied to a thread Tuning in Yaesu
    Well Obed, not to be combative, but unless you can bend the laws of physics, you cannot make a non resonant antenna resonant by just cancelling out the reactive or resistivity component. As you claimed, all you are doing is tricking the radio to accept what ever is connected to the feed line... As you claimed, all you are doing is changing the impedance of the line at the radio end. Anything not adsorbed by the load or the line is reflected back towards the source, turned into heat. Good for keeping your coffee warm, but not good if you want that power to be used efficiently. How many times have you heard someone brag that they are running 100w.. When in fact what they are radiating is much less than the 100w the transmitter could produce - had the antenna been resonant... Point in case someone misses it is the G5RV. Which is semi resonant on 20 meters, not resonant at all on 10 or 40 meters.. Wanna buy a burned up MFJ antenna tuner, just ask everyone that ever tried tuning their G5RV...
    13 replies | 427 view(s)
  • Obed's Avatar
    Yesterday, 16:16
    Obed replied to a thread Tuning in Yaesu
    your radio should be able to turn the built in tuner off...
    13 replies | 427 view(s)
  • Obed's Avatar
    Yesterday, 16:14
    Obed replied to a thread Tuning in Yaesu
    well sixmeters made a technical error in his statement... he said in a perfect world the tuner does not tune the "antenna system" it just tricks the radio... that is not correct... the radio does not know what is out there, it does not know what type or how long the coax, transmission line etc is, it does not know what the antenna is... it only know what it sees at its output... the tuner actually does tune the LOAD to an impedance match...it does not affect the efficiency of the antenna... lots of folks like to use the old wives tale of just "fooling" the radio... it does not do that... it does impedance match the load...lots of radios do have a built in function to reduce the power out if it does not see a good impedance match..l which is the whole load, not just the antenna.
    13 replies | 427 view(s)
  • Obed's Avatar
    Yesterday, 16:09
    on commercial flights here you can not do it, but private pilots can.
    7 replies | 86 view(s)
  • OH8GAD's Avatar
    Yesterday, 15:31
    The D220R is for 100 to 1600MHz. Most of the amateur radio bands are fairly close to being harmonically related: 1,8 MHz/160 m, 3,5 MHz/80 m, 7 MHz/40 m, 14 MHz/20 m and 28 MHz/10 m, so you can just string out a length of wire at one of these lengths. It's not perfect, but you should get something. But bear in mind, the HF bands can be rather fickle and event with a perfect antenna for that band, you might not hear anything at all. As well as the long wire, you could knock up a simple antenna tuning unit** from a large variable capacitor and coil of stripped down mains cable and see what you can get. **Yes, yes, I know some folk consider these to be instruments of the devil, but hey, you're just starting out and it's a good place to start*learning how adding things work.
    2 replies | 78 view(s)
  • OH8GAD's Avatar
    Yesterday, 15:15
    It's country by country: In the UK, it is forbidden, but in Finland, you must have permission from the Finnish Transport Safety Agency (TraFi) and the pilot of the aircraft.
    7 replies | 86 view(s)
  • Gopher5's Avatar
    Yesterday, 14:31
    Gopher5 replied to a thread Mobile Radios IC706MK11G Won't Key in CW Mode in Icom
    Tnx very much Eric. That was the problem. Q4-CW PADDLE was set at default or (n). I changed it to (off) and it will now key. I think I am getting too old with these new technology radios as it was simple to operate in the old Collins KWM2A and 30L1 era. 73's es tnx agn, Forrest K0MK
    2 replies | 78 view(s)
  • Joevano's Avatar
    Yesterday, 12:30
    New tech here, passed by exam on Saturday. Bought an SDRPlay RSP1A and Diamond D220R antenna. I'm finding out now that the antenna is not as multi-band as I thought it was, and an end-fed wire was recommended to me for HF bands. For receiving only, isn't there a wide band antenna I can use for all frequencies?
    2 replies | 78 view(s)
  • Obed's Avatar
    Yesterday, 11:20
    it is legal here... on the ham bands of course. We have several pilots here in the Houston area who are hams, and they do a bit of operating from time to time... some of them just use an ht.
    7 replies | 86 view(s)
  • 5B4AJB's Avatar
    Yesterday, 09:07
    In Europe, it's prohibited - you'll have to check your license for the U.S.
    7 replies | 86 view(s)
  • FlyGuy's Avatar
    Yesterday, 03:52
    I just recently received my Technician License, and I was wondering if there are any rules/regulations regarding airborne operation? I'm a private pilot, so I was thinking about taking a portable up on one of my next flights, and giving it a shot. Any advice would be much appreciated. Thanks!
    7 replies | 86 view(s)
  • WZ7U's Avatar
    Yesterday, 01:16
    WZ7U replied to a thread Mobile Radios IC706MK11G Won't Key in CW Mode in Icom
    Probably have the mic set for keying. Check your setting in quick setting mode #Q4; off is for a straight key, ud is for use of the microphone up/down buttons. Check that and get back to us. Maybe an open connection somewhere between the key and the plug? Q5 is a setting for use when you use the mic buttons or a paddle. Hope this helps, get back and follow up for more.
    2 replies | 78 view(s)
  • BobAtom3's Avatar
    Sun 12th Aug 2018, 22:37
    Yup, that is what it is, and that is what I did, and that is what worked. Thanks!!
    12 replies | 3310 view(s)
  • BobAtom3's Avatar
    Sun 12th Aug 2018, 22:32
    Newbie here, but someone below had the answer. You cannot be receiving on the channel you are trying to program. I took off the antenna as recommended, keyed in a NOAA freq and viola, it worked! I spent an hour trying to figure out why I could program any other random channel with success. I remember reading about programming channels while receiving is a no-no.
    12 replies | 3310 view(s)
  • Gopher5's Avatar
    Sun 12th Aug 2018, 14:56
    Gopher5 started a thread Mobile Radios IC706MK11G Won't Key in CW Mode in Icom
    I recently purchased a used Icom IC-706MK11G and did the Quick set and Initial set modes. Now I am unable to get the xcvr to transmit in the CW mode. It has both a FL223 narrow ssb filter and a FL232 cw/rtty filter installed in filter 1 and filter 2 slots. The key is good. Can anyone tell me what I am doing wrong?
    2 replies | 78 view(s)
  • Ots's Avatar
    Sat 11th Aug 2018, 19:49
    Ots replied to a thread Tuning in Yaesu
    I'm getting the feeling that we are addressing separate issues. But that's OK - I think it's time to drop this. Thanks for the responses.
    13 replies | 427 view(s)
  • Sixmeters's Avatar
    Sat 11th Aug 2018, 18:38
    Sixmeters replied to a thread Tuning in Yaesu
    I think this all goes back to what you should have learned when you obtained your technician class license, but did not learn, because there is no minimum requirement of what you should know when you were first licensed. In electronics / communications 101 - you would learn that in a perfect world a antenna tuner doesn't really tune a antenna system, it just tricks the transceiver into applying all or most of its power into the tuner.. The dummy load - in theory, if you apply power into a resonant load, all the power applied is absorbed by the load - hence if you think your radio produces 100w, most all of the 100w is applied to the dummy load. However, when you connect jumper cables between the transmitter and the tuner and the dummy load
    13 replies | 427 view(s)
  • Ots's Avatar
    Sat 11th Aug 2018, 16:42
    Ots replied to a thread Tuning in Yaesu
    "...when you put the dummy load in line, your tuner is not doing anything...the dummy load is already a "perfect" match..." So if I understand what you are suggesting, my FT-450D with its built-in tuner, will always present a 50 Ohm impedance at the output of the transceiver. So even if I connect an antenna system to the transceiver that will resonate at 45 Ohms and I have this built-in tuner tune to this antenna system, instead of matching impedance at 45 Ohms it will stay at 50 Ohms. I would think that it would match the 45 Ohms of the antenna system as that's its job. So what do I do if I want to return it to 50 Ohms, for whatever reason? Reset the rig to its factory settings? That would do it, of course, but at the cost of losing whatever other settings I've changed, so that is not a desirable solution.
    13 replies | 427 view(s)
  • OH8GAD's Avatar
    Sat 11th Aug 2018, 00:03
    OH8GAD replied to a thread Argosy in Ten-Tec
    Well, since you need to be fairly self contained, you need to decide how you're going to manage things: Buy new stuff, guaranteed to work, or make do and mend. I guess it comes down to finances and what you can do in the motorhome. I mean, do you have the space to work with a soldering iron and knock up a few kits? If yes, then I know of a few useful, cheap kits that would help. Rob.
    3 replies | 249 view(s)
  • kb0zke's Avatar
    Fri 10th Aug 2018, 23:21
    kb0zke replied to a thread Argosy in Ten-Tec
    Thanks. Since we travel full-time in our motorhome I'm rarely in a place when the local club has a meeting. More often that you might think, the monthly meeting was the week before we arrived.
    3 replies | 249 view(s)
  • OH8GAD's Avatar
    Fri 10th Aug 2018, 21:59
    OH8GAD replied to a thread Argosy in Ten-Tec
    Frequency is a good start. Are you in touch with any other local radio amateurs? If so, then see if someone can visit with a 40 metre rig and tune around until they locate your signal. If not, then do you the facility to do soldering? If you do, then check out the web shop Banggood (www.banggood.com), they do a really good 0 to 50 MHz frequency counter for less than USD 10 - seriously, they are bl00dy good, I have two. But make sure you either protect the input or reduce your rig's output power to milliwatts. But, still try and find your nearest amateur radio club, there should be folk willing to help.
    3 replies | 249 view(s)
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