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  • paulears's Avatar
    Today, 09:41
    paulears replied to a thread Mobile Radios Setting a Feq in Amateur Radios
    The notion of people randomly buying a Baofeng transmitter to use in aircraft band is frankly a bit scary! I can't think of any reason whatsoever for somebody to do this - clearly they are not a typical user of aviation bands because those that are take tests, buy expensive radios and know how to use them, and what kinds of nasty things could happen if you don;t do it correctly. There is NO equivalent of a cheap Chinese radio on sale that covers airband. I suspect the OP has got their wires crossed somewhere and been given duff information on that frequency.
    2 replies | 73 view(s)
  • vk2bze's Avatar
    Yesterday, 23:18
    vk2bze started a thread 6 metre DX in Propagation
    This is further to my article back in 2006 in which I claimed six (and 2) metres are ducted at around 15000ft and travel for thousands of kilometres. By studying reflections from planes I have proved the above to be true and the methods are easily repeatable by anyone living close to airports. I am 60klms from Sydney. The effect is even more pronounced on 2 metres but readily observable on 6. The following was written about another magazines article. I was just reading your primer article on 6 metre E propagation. As with all E articles the theory is very malleable and ridiculous short and long distance are claimed for contacts in this magical mode. I have studied 6 metres in Australia and New Zealand for many years. It is a vast area of some 7000klm in lenght and 5000klm in height so it gives a good sized mix of distance and terrain. My observation using plane bounces are that most 6 metre propagation is done in a layer around 15000ft (around 0 degrees C). It first started with analogue TV video...
    0 replies | 52 view(s)
  • pmh's Avatar
    Yesterday, 23:07
    A subject many of us are currently involved in. The Amsat and Amsat-UK websites are good ones. I'll be finishing my aerial over the weekend, the design can be found here:- https://www.george-smart.co.uk/wiki/Dual_Band_Satellite_Yagi Some aerials use two handhelds:- 1 for receive and 1 for transmit. The above design uses 1, using appropriate memories to jump between receive and transmit.
    1 replies | 58 view(s)
  • WA9WVX's Avatar
    Yesterday, 20:20
    WA9WVX replied to a thread Mobile Radios Setting a Feq in Amateur Radios
    Hello Kat, Apparently you didn't read the Frequency Specifications as this handheld portable transceiver is ONLY capable of covering 136-174 MHz on the VHF Band and 400-520 MHz on the UHF Band. As for what you have heard that it is possible to tune this transceiver down into the Commercial Aircraft Band probably requires a special Hexadecimal Coding Function and I know that all aircraft use Amplitude Modulation (AM) oppose to these Baofeng handhelds using Frequency Modulation (FM). It would be interesting to know why you want to use the handheld on 120.800 MHz? In the United States there are Federal Communications Commission Rules & Regulations pertaining to the Illegal use non compliant (Type Accepted) two-way radios for the Commercial Aircraft Bands under Part # 87. Dan WA9WVX
    2 replies | 73 view(s)
  • iDuncan's Avatar
    Yesterday, 18:50
    Hey everyone, After a long break from amateur radio, I've decided to jump back in. Since my return, I've found the idea of satellite communications fascinating and have set out to build an appropriate antenna. My hope is to construct a dual-band, handheld yagi antenna. I've been reading lots of articles on the construction of different antenna but I still have lots of questions. 1) How does one go about mounting a UHF yagi on a VHF yagi? 2) What's the best way to go about splitting the channels? Should I try to make a splitter or get a 'commercially' made duplexer like the one from Arrow Antenna? 3)How should the driven element(s) be fed?
    1 replies | 58 view(s)
  • ota's Avatar
    Yesterday, 15:08
    ota started a thread Hello everyone in Introduce yourself
    Hello, I'm new to ham radio. My wife and are preparing to sail the tropics (in 3-5 years) and I decided that I would need SSB for communications and for weather reports. Well that lead to researching ham radio, which I've always been intrigued about, and now taking my technician license and looking for a mobile unit. I'm glad to be hear and learn what other have to teach. Rob
    0 replies | 40 view(s)
  • G0LTG's Avatar
    Yesterday, 12:58
    Hi all, just having a look around and saw this discussion. I picked up a 30-l for restoration last year and have been slowly putting it back together. I don't have any screws at all for reference! Did anyone manage to find a source or suggested sizes? Any direction would be appreciated. regards Laurie G0LTG
    8 replies | 193 view(s)
  • charlie's Avatar
    Wed 18th Jan 2017, 21:04
    charlie replied to a thread Moorse Groups in The Junk Box
    My friend, you are there!! Anything you want to know, just ask. Someone will have the answer for you. Charlie
    6 replies | 239 view(s)
  • charlie's Avatar
    Wed 18th Jan 2017, 20:59
    Depending how long ago you left the hobby, you might find you're talking to yourself. I left in the early 90's and, getting back in, I've discovered everything has shrunk down to where a magnifying glass is needed to find the soldering points. LOL I think you'll see that the climate is easier to take in AZ than "back home". The rain has changed to heat. LOL Welcome aboard Charlie K3UIM
    3 replies | 79 view(s)
  • littlestrawberryfox's Avatar
    Wed 18th Jan 2017, 19:58
    littlestrawberryfox started a thread Mobile Radios Setting a Feq in Amateur Radios
    Hi Everyone I need some help I have a Baofeng GT-3tp Radio but I am trying to get it to tune into feq 120.800 but it keeps saying its too low. what do I do as I cant find any other radio that can tune into that but I have heard there is a way to program the radio to get that feq. I have all the software but not sure what I can do as I have tried just typing in the feq but I get an error. what do I do or what can I do? Kat
    2 replies | 73 view(s)
  • N4AAB's Avatar
    Wed 18th Jan 2017, 19:34
    Hello and congrats on passing your test !
    4 replies | 109 view(s)
  • N4AAB's Avatar
    Wed 18th Jan 2017, 19:33
    Howdy ! Welcome aboard !
    2 replies | 70 view(s)
  • pmh's Avatar
    Wed 18th Jan 2017, 18:54
    The Diamond is a much better aerial in my opinion. The ground plane design depends on the construction. In the white tube of the Diamond, for example, you'll find a length of copper with coils at various spacing. The length, and angle, of the ground plane brings the aerial to 50ohms. The MFJ needs a different length, and possibly angle, to make it 50ohms. Kind regards,
    1 replies | 71 view(s)
  • paulears's Avatar
    Wed 18th Jan 2017, 18:23
    paulears replied to a thread Hearing a CTCSS tone in The Junk Box
    If you record the signal into something like audacity, you can then analyse the waveform and see the small CTCSS spike, and then find it's frequency. The reason you can't hear them is a mixture of a gentle high pass filter on the audio, to filter it out, and the small speakers which don't work very well down to 60Hz or so. The high tones in the 250Hz area can just be heard - especially on headphones. If you have a scanner, why not connect to a hifi? I now use a frequency analyser that has a CTCSS decode facility/.
    1 replies | 76 view(s)
  • Sudden's Avatar
    Wed 18th Jan 2017, 11:42
    I am trying to setup a radio to call a 70MHz anologue repeater which is only 10 miles away. How can I find out if the CTCSS tone is actualy being transmitted. I am not accessing the repeater with either radio. It could be the pain and simple fact that the repeater is not working. I have been told that you can hear the tone using a scanner but I thought the tones are sub audible, so how can you hear them.
    1 replies | 76 view(s)
  • pmh's Avatar
    Tue 17th Jan 2017, 23:19
    Hello, And welcome to the forum. Kind regards, Phil
    2 replies | 70 view(s)
  • Hideogumperjr's Avatar
    Tue 17th Jan 2017, 22:33
    Hideogumperjr started a thread Mobile Radios Icom 706mkiiG memory/VFO weirdness in Icom
    Hi Folks hope some one might know whats going on here. I have a 706mkiiG I am using for emergency setup for my community. I am programming local repeaters into memory for emergency use if needed. I have added 10+ repeaters into memory with no problem but all of a sudden I can no longer get into memory mode when I select V/M under M2 like I was able to do before. I am unclear if I have selected some mode that precludes me from getting into memory mode but when I select V/M and the display shows "MEMO" rotating the channel select knob only changes frequency and not the memory channels. Any ideas on what I have done? This happened before and I reset the radio blowing all of the memory channels away and it worked as expected again. Thanks John
    0 replies | 44 view(s)
  • Hideogumperjr's Avatar
    Tue 17th Jan 2017, 22:26
    Hello all, looking forward to chatting with yall and getting to know you and taking advantage of the skills and experience online here.
    2 replies | 70 view(s)
  • WA9WVX's Avatar
    Tue 17th Jan 2017, 20:40
    WA9WVX replied to a thread Base Radios Radio Shack HTX 10 (10 Meter) in Amateur Radios
    Hello John, I'd be skeptical about using the Radio Shack HTX-10 with a VSWR of 2:1 as I had a friend that used the same transceiver for a Beacon and he had a 2:1 VSWR but it was causing Spurious Emissions all across the 1.8 to 30 MHz Frequency Bands and who knows about into 30 MHz and above as this ham didn't want me to pull out my Spectrum Monitor & Check. Since you purchased a pre made 10 m Dipole, I wonder what Frequency that Dipole was Cut & Tuned for? Then since this antenna is in your attic, I hope you kept it away from HVAC ducts and Electrical Rolmex and/or Conduit which can easily affect the VSWR of the Dipole. Using PVC pipe for making a RF Choke normally requires a 4" Outside Diameter PVC pipe. Phil M0KPH is correct about the length of the RG-8X Coaxial Cable adding Losses to your RF signal as RG-8X has 2 dB which is equal to 40% of the RF is loss in the cable alone. I just did some quick calculations for 28.4 MHz and the overall length of the Dipole should be 16.5' End to End. If the length...
    6 replies | 112 view(s)
  • Dougal's Avatar
    Tue 17th Jan 2017, 20:25
    Hi guys Very new here and also to amateur radio, so I'm still on a very steep learning curve. Thoroughly enjoying the process though. Could someone try to explain to me, why these two antennas are able to have very different ground planes? http://www.radioworld.co.uk/amateur_radio_antenna/vhf-uhf-base-antennas/vhf-uhf-vertical-antennas/diamond-2m-70cm-vertical-antennas/diamond-x-50-2m70cm-fixed-station-vertical http://www.radioworld.co.uk/amateur_radio_antenna/uhf_vhf_antenna_accessories/mfj-1754_2m_70cm_ground_plane_home_base_antenna
    1 replies | 71 view(s)
  • pmh's Avatar
    Tue 17th Jan 2017, 19:51
    Congratulations. Good luck with the rest of your studies. Kind regards, Phil
    4 replies | 109 view(s)
  • pmh's Avatar
    Tue 17th Jan 2017, 19:38
    pmh replied to a thread Base Radios Radio Shack HTX 10 (10 Meter) in Amateur Radios
    2:1 will do, but it's not ideal. You should reduce it if you can. You also only want to use the minimum amount of coax, it has losses too! Kind regards, Phil
    6 replies | 112 view(s)
  • AuburnAlum's Avatar
    Tue 17th Jan 2017, 19:07
    Just an update I received my license this morning! KN4ACT It only took one Federal business day (yesterday was a holiday for MLK). Cannot wait to get on the air and waiting like a kid for Christmas for my initial learning gear to arrive. Thanks for all the help on this!
    4 replies | 109 view(s)
  • sparky89's Avatar
    Tue 17th Jan 2017, 14:52
    Lloyd, Thanks for that thought. I had considered that chopping the wire was the easiest way out. My particular QTH is really awkward and, in order to clear well away from phone lines, I have to have both low ends at least 8m off the ground on poles. I have enough scaffolding to reach one end or the other but not both! So trimming would be a very laborious process indeed. I can't bring it down to a lower level as it would foul the aforesaid phone lines (which go to various neighbours so I'm trying to reduce crosstalk/pickup/Standing waves on the downleads as much as possible). Which brings me to another thought, which is that I quite fancy 80m as well and have 'just' enough room for a full size 80m V, and I think covering that with one trim-length is not so easy. I'm an electronics designer, so everything looks like an electronics/software challenge to me! 73 David
    2 replies | 71 view(s)
  • kc5fm's Avatar
    Tue 17th Jan 2017, 13:08
    kc5fm replied to a thread 40m Inverted V auto tuning in Antennas
    Probably your research could conclude that the 40-meter band is so narrow that an inverted VEE would cover the whole band with a reasonable Standing Wave Ratio with no tuner required. Most hams cut the antenna for the portion of the band of most interest and use it from there. 73 Lloyd, KC5FM
    2 replies | 71 view(s)
  • Rob_P's Avatar
    Tue 17th Jan 2017, 13:06
    A push button rotary encoder has 5 pins, 2 are for the interrupts, so the microcontroller knows the direction of movement, 1 is for the push button switch usually used to change the step of frequency change, and the other 2 are positive and negative power. Also ask the seller for a link to the manual, they will usually have something in chinglish that may or may not be of much use, generally you will get a schematic, a BOM if you are lucky, and now and again you get instructions that are useful. Mostly though you can work things out with a little thinking, though its not always obvious what is needed.
    7 replies | 499 view(s)
  • sparky89's Avatar
    Tue 17th Jan 2017, 11:49
    Hi, I'm erecting a 40m inverted V for SWL with a view to going for Foundation/Intermediate later this year. Because of the height, the wire ends will be out of normal reach so I'm working on a way of auto tuning the antenna. I was thinking that if the lower wire ends were fed to a telescopic rod end section with an insulated threaded rod arrangement and a stepper motor at each end, I could drive the stepper motors to increase/decrease the effective wire lengths simultaneously. Obviously the wire strain would have to be taken by a separate insulated arrangement and the whole lot would have to be waterproofed. It's such an obvious thing to do that I'm surprised I can't find anybody doing it before (except for mobile antennae) , which makes me suspect there's a big catch I'm not seeing! Any ideas on this, please? The engineering is not a problem.
    2 replies | 71 view(s)
  • pmh's Avatar
    Tue 17th Jan 2017, 09:17
    Hello, And welcome to the forum. There are probably a few new data modes since you were last on the air, so plenty to have a go at. Kind regards,
    3 replies | 79 view(s)
  • 2E0FVL's Avatar
    Tue 17th Jan 2017, 08:53
    That's the thing with retirement - how did you ever find time to work!! Welcome back to radio. :encouragement:
    3 replies | 79 view(s)
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