Activity Stream

Filter
Sort By Time Show
Recent Recent Popular Popular Anytime Anytime Last 24 Hours Last 24 Hours Last 7 Days Last 7 Days Last 30 Days Last 30 Days All All Photos Photos Forum Forums
  • Obed's Avatar
    Today, 10:58
    Obed replied to a thread newbie saying hi in Introduce yourself
    welcome to the forum.
    1 replies | 18 view(s)
  • WZ7U's Avatar
    Today, 04:52
    I just hog out the adapter a little bit to fit the size difference with a drill bit. I also just use friction for the shield connection. It works great for me! I've run up to 400 watts SSB/CW into RG-6 for quite a while now without detrimental effect that I can determine. I'm thinking you will have more trouble using an end fed antenna than using RG-6 coax (the catv quad shield stuff). Check with your local catv installers to see if they have a spool end they would rather give you than go to the dump with it.
    4 replies | 84 view(s)
  • stormtracker78's Avatar
    Today, 03:40
    Hello to all from the farthest point of Texas, Brownsville and South padre island. ive been into sw and ham radio for years and im in the process of getting ready to take the no tech license if omg I can get antenna theory down!!it all started for me when in 1975 when I was 5 years old my grandpa got me an orbiter satellite sw radio, hearing those stations overseas the bbc being my favorite I will never forget at that time it was strictly sw for my passion but when my dad passed away couple of years ago I made it a point to get my license as my dad grandpa and uncle all had ham licenses they were from Ohio my main family was from wads worth and Akron now that im married and settled im going to take advantage of the no tech my grandpas was a Morse code reader on the navy ships during ww2 and could read and talk with flashlights!! growing up I also started with scanners the old ones you bought the crystals for as well and various radio equipment right now I own a Grundig satellite 750 and bcd 396xt and 346xt...
    1 replies | 18 view(s)
  • brandon lind's Avatar
    Yesterday, 19:44
    A mismatch between 50 and 75 ohms will yield an SWR of 1.5. In other words, 4% of whatever wattage encounters the mismatch will be reflected. At an SWR of 1.5, the mismatched loss in dB is 0.178, which is probably better than the loss in any broadband transformer you might buy. Go for it! Most 75ohm coax I am familiar with is used for TV and satellite hookup. Knowing these signals reach into the UHF region, I would assume the loss in these cables would be insignificant at HF, but the power levels they can handle are not great as they were designed for reception only. A quick look at the coax list in the ARRL handbook shows that typical 75ohm coax has a maximum Vrms of 300V. Since forward signals add to reflected ones to make the standing wave, we can assume a maximum forward voltage on these cables should be kept under 150Vrms. Since E^2\R=P, 300w at a total mismatch would yield a maximum standing voltage at the hot spots of 300V. So, to be safe, if you intend to TX on that cable, I would recommend...
    4 replies | 84 view(s)
  • OH8GAD's Avatar
    Yesterday, 16:35
    Oh yeah, and welcome to the forum! :)
    4 replies | 84 view(s)
  • OH8GAD's Avatar
    Yesterday, 16:32
    The specs give the input impedance at 50 ohms (link: https://www.universal-radio.com/catalog/commrxvr/0084spec.html), so I would stick with 50 ohm. Since you're not putting power into the cable, you're not going to damage anything, but from what I've read, 75 ohm stuff is generally much more lossy than 50 ohm cable. I think it is because the 75 ohm cables are usually made for broadcast receivers such as TV and FM radio, where power levels are much, much higher that trying to pull in an amateur station running 500 mW the other side of the globe on 20 metres. Also, I'm not sure about PL259/SO239 (laughingly called "UHF") connectors, but with N-type connectors (N, BNC & TNC), the centre pin for the 75 ohm type is wider than the 50 ohm version. So, if you put a 75 ohm plug into a 50 ohm socket, you risk damaging it.
    4 replies | 84 view(s)
  • stormtracker78's Avatar
    Yesterday, 00:02
    I just got my alnico dxr8t in and also my qso king 117 foot end fed antenna with there 9:1un/un from bruce at maple leaf which coax would be the best im thinking of drf 400 but since its receive only receiver I am hearing 75 ohm is just as good and cheaper but if im right the end fed should match the receiver which I believe is 50ohms any advice would be so appreciated thanks!!
    4 replies | 84 view(s)
  • paulears's Avatar
    Mon 18th Mar 2019, 08:35
    What's reception like? Do you get a sharp peak in performance at the frequencies you think the antenna is resonant? Does the background noise shoot up at a certain frequency and then drop off again the other side - that will give you a clue if your antenna is actually working. If your antenna appears to function on the wanted bands, then I'd give it a shot - but if you need proof of matching, then wait for the VSWR meter and set your mind at ease - Me, I'd listen for somebody calling and respond to them and see what happens.
    5 replies | 219 view(s)
  • brandon lind's Avatar
    Sun 17th Mar 2019, 17:06
    The voltage in the service manual states: 7.2v nominal, 6-16v while on external supply and 11 to 16v while charging. If you have 7.9v, I would think that's within spec. Does it affect just the display or does the actual TX/RX frequency drift as well? If so, does it do it in both 2m and 70cm or just one of the bands? I imagine a problem like this needs a scope to track down. Everything looks like surface mount parts in the manual. Do you have a scope? If I had to guess without knowing anything else, I might suspect a worn rotary dial. There are also 2 electrolytic capacitors, one of which (C1004) is at the input to the 3v regulator (and the 3v regulator appears to supply the PLL). It might be worth checking.
    1 replies | 95 view(s)
  • GTGallop's Avatar
    Sun 17th Mar 2019, 15:15
    I picked up the ARRL VE and a buddy of mine hooked me up with the Laurel Group so I got their VE as well. I'd recommend you doing the same. Laurel uses computers so the test is submitted instantly vs sending in all of the paperwork. Just because we like radio doesn't mean we have to manage paperwork like Marconi did. https://www.marcclub.org/mweb/education/exams/volunteer.html
    3 replies | 154 view(s)
  • N4AAB's Avatar
    Sun 17th Mar 2019, 00:14
    The voltage reads 7.9v when I turn it on. I have had the radio for a few years, about 3. The frequency readout on the front wobbles up and down. Before it read 147.090 just like it should, but this year the read out wobbles up and down. Sometimes as much as a MHz. More typically up and down about 3 to 5 KHz. What could be wrong with it ? Could the battery be bad ? Thanks. I haven't checked it with the adapter, but last time I charged it the voltage read 11.? Volts when it was being charged. The case got hotter than usual during charging.
    1 replies | 95 view(s)
  • N4AAB's Avatar
    Sun 17th Mar 2019, 00:06
    Yes, ARRL VE. Working with the ham radio club I belong to.
    3 replies | 154 view(s)
  • KD3WB's Avatar
    Fri 15th Mar 2019, 17:09
    KD3WB replied to a thread Base Radios Low power related to antenna mismatch? in Amateur Radios
    You need to perform the initial tune up. See the "Transmitter Section" of page 140 in the manual. I don't think the rig cuts back on power in a mismatch situation, so keep your test transmissions short. Ben
    5 replies | 219 view(s)
  • K7KBN's Avatar
    Fri 15th Mar 2019, 06:59
    K7KBN replied to a thread Base Radios Low power related to antenna mismatch? in Amateur Radios
    Another piece of equipment that would be useful here is a dummy load. That would rule out the antenna and feedline. You DID get the operating manual for the 101, right? I built the HW-101 back in the 1970s. With its pi-network output, a separate "tuner" is often not required. I operated mine for a couple of years before I ever used an SWR indicator. My 20 and 15 meter dipoles each had over 2:1 - almost 3:1, but the transmitter was putting out full power CW with no strain. More modern rigs, especially the solid-state final-types, are much more finicky with loads they don't like. That's where the dummy load shines. Just a 50 ohm, non-inductive resistor or combination of resistors equaling about 45-55 ohms and sized to handle the transmitter power. Presents a near-textbook load for the typical "50 ohm" output of a typical ham transmitter.
    5 replies | 219 view(s)
  • WZ7U's Avatar
    Fri 15th Mar 2019, 06:52
    As long as someone has a license, they can transmit the radio, but I don't see on the web where a built in swr meter is a feature. I doubt a cb swr meter will work as accurately as you might want for a $300+ radio. Maybe someone in the area has one you could use, or watch while they do it or something. I grew up next to the front range near Littleton way back in the 20th century. I sort of miss that part of the world, but I do not miss the bomb cyclone you guys just had. Stay safe, stay warm.
    2 replies | 122 view(s)
  • WZ7U's Avatar
    Fri 15th Mar 2019, 06:45
    WZ7U replied to a thread Base Radios Low power related to antenna mismatch? in Amateur Radios
    Without knowing the specifics of how you are going about this, are you certain you are loading the transmitter up properly? It seems to me with the two knobs in the upper left you should be able to peak and dip the finals to achieve max zap. Unless you are trying to tune up in an ssb mode... Try using a cw key (or just any old switch will do) to engage the transmitter and tune 'er up. If I'm not mistaken, that rig should be able to handle a bit of mismatch with ease by simply tuning the knobs. Perhaps you should scour the net for detailed tuning instructions for your rig so you are nearly guaranteed of getting it right the first time. Just my .02Ę
    5 replies | 219 view(s)
  • Jon Hudson's Avatar
    Thu 14th Mar 2019, 16:57
    SDRplay is pleased to announce the release of SDRuno v1.3. This is a major upgrade to SDRuno, which adds a number of important new features and is intended for all RSP models including the now discontinued RSP1. Major new features include: Frequency Scanning (for both frequency ranges and stored memory panel lists) I/Q → Audio Output (for CW Skimmer for example) A new configurable IF AGC scheme For a full list of additions/changes and bug fixes, please see the release notes at: https://www.sdrplay.com/doÖ/SDRplay_SDRuno_Release_Notes.pdf
    0 replies | 84 view(s)
  • K5MOW's Avatar
    Thu 14th Mar 2019, 11:39
    K5MOW replied to a thread Base Radios Low power related to antenna mismatch? in Amateur Radios
    I am not real familiar with a Heathkit radio. My dad had one in the early 70s and thatís what got me interested in amateur radio but I have never purchased one yet. As for your question. A modern transceiver will definitely drop in power when the antenna is not matched properly. Radio at that age would most likely be extremely dangerous transmitting. I would think it would be easy to burn out the finals when the antenna is not matched properly. The quick answer to your question is yes I believe the power would be dramatically dropped if the antenna is not matched. Transmit on very low power with your tuner and SWR in line until you get it matched. Roger
    5 replies | 219 view(s)
  • K7KBN's Avatar
    Thu 14th Mar 2019, 04:57
    Hi Tinbender - My mom was born in Burlington CO, just a short distance from KS. She told me that there was a "Welcome to Burlington" sign at the turnoff from the highway and somebody had put a "Welcome to Kansas" sign on the same post. I still have a few relatives in Kanorado KS which is a LOT closer to CO.
    2 replies | 122 view(s)
  • hyperlogos's Avatar
    Thu 14th Mar 2019, 02:48
    It's worth a try, thanks!
    2 replies | 107 view(s)
  • KI5DQT's Avatar
    Thu 14th Mar 2019, 02:07
    I just installed a fan dipole AND just got my first rig, a Heath HW-101. The rig is not putting out much power, barely twitching the needle. I haven't yet put a SWR meter or antenna tuner on the dipole (waiting for both to get here), but my question is this: will a mismatch between transceiver and antenna cause rig to put out less power? I'm trying to troubleshoot whether the rig is at fault or it's just not happy with the antenna. (Previous owner of Heath says it was putting out 100W last week, so it's a real dilemma.). Thanks for any insights. KI5DQT
    5 replies | 219 view(s)
  • brandon lind's Avatar
    Thu 14th Mar 2019, 01:50
    stumbled on this, not sure the accuracy of it though. https://www.worldwidedx.com/threads/hr2510-no-display.32509/#post-178084
    2 replies | 107 view(s)
  • KC3MXI's Avatar
    Wed 13th Mar 2019, 14:14
    HI Everyone, I am a newly minted ham from Maryland. I just got my tech and are working toward my General for the next test date. I have always loved the idea of amateur radio and look forward to many aspects of this HUGE hobby. I inherited a Kenwood TS440s sat from a old friend who is sadly now silent key. It would be an honor to be on the air with his rig. I also have a Baofeng HT BF8 that I picked up from Amazon. I have yet to make first contact, but that is coming soon I hope. I have been researching antennas and wow - it is a bit overwhelming! I have a small 1/3 acre lot (No HOA, just an XYL) and can use the half behind the house (full of huge live oaks) for a reasonable antenna setup. I can also use some of my second story deck (I was thinking to mount a mast to). I have been looking at the popular G5RV for my HF setup, but I am not sure I have 102 feet of ground space. I can for sure fit a G5RV jr at only 51 feet across. The hardest part to figure out for me seems to be what do I need to...
    0 replies | 113 view(s)
  • Tinbender59's Avatar
    Wed 13th Mar 2019, 01:42
    Well hello everybody, been thinking about ham radio for many years my second son decided we needed to get into Ham radios for our 4 x 4 club so he and I both bought Yaesu FTM 100 "CD?" I think on the CD. Still have to take test (next month) my radio arrived today, and I'm preparing to set it up. I'm worrying about the SWR. Since I'm at work i havent seen it yet. But does it have a built in swr meter? And can i use my old CB meter??
    2 replies | 122 view(s)
  • hyperlogos's Avatar
    Tue 12th Mar 2019, 23:52
    I have a President HR2510 which isn't working which I'd like to either get quick tips on fixing if there's some known problem, or give away to someone who can fix it and get some use out of it. It's a 10 meter radio which some prior owner hacked to also do 11 meter. It worked when I put it away, but when I plugged it in just now, nothing came up on the display. The backlight comes on, but that's it. If there's a well-known problem, tell me, I've got tools. If there isn't, tell me you want it and pay the shipping, and you can have it I've got a matching power cable, too. Located in Albion, CA
    2 replies | 107 view(s)
  • jack89's Avatar
    Tue 12th Mar 2019, 22:08
    Hello all. I'm retired Army and now retired everything. I live here in sunny Arizona and have some time on my hands. I got my General license a few years ago, mostly because my father was big into it for search and rescue. He has since passed and left me his mobile equipment. It's been sitting for a couple of years, but I've decided to get into it and see where it goes. He left me 4 mobile radios; Yaesu FTM-350, Kenwood TM-V71A, Yaesu FT-2900 and an ICOM IC-7000. He also left me a handheld, a Kenwood TH-D72A. I've also got a few vehicle antennas to include a large Scorpion antenna. I'm going to install one of the radios in my truck for starters and go from there. Not sure which one yet. To be honest, I don't remember much and have some learning and re-learning to do. Looking forward to it.
    0 replies | 64 view(s)
  • K6CPO's Avatar
    Tue 12th Mar 2019, 21:52
    I'm assuming ARRL VEC? As far as I know, each VEC has to qualify their VEs themselves, although some will accept the other's qualifications. When I became a SANDARC VE, I sent a copy of my SANDARC certificate to the ARRL and they made me an ARRL VE without having to take the ARRL's little exam.
    3 replies | 154 view(s)
  • WZ7U's Avatar
    Tue 12th Mar 2019, 19:20
    It sounds more like he needs a scanning receiver, digitally enabled, so all those variables can be heard. You aren't going to find a transmitting radio that will do all that, for good reason. Most people have no business transmitting on public service bands anyway. When the term "handheld" gets used in a forum like this one, most automatically go to the transceiver notion, but it seems to me you want to hear all this stuff instead. It's all in the nomenclature.
    5 replies | 167 view(s)
  • Psmith7863's Avatar
    Tue 12th Mar 2019, 17:57
    Psmith7863 started a thread Transmitting Tone in Ten-Tec
    I recently became the proud owner of a Ten Tec Jupiter (green screen). Have not had the chance to play with it until the last few days. When I push to transmit I get a loud tone, the same tone you hear when you tune. Is this normal? I swear I do not remember that when I first tried out the radio. I also get that tone when using the key. It is very annoying and I really donít think it is right. Any suggestions?
    0 replies | 64 view(s)
More Activity