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  • Big Daddy63's Avatar
    Yesterday, 21:01
    Well, I was hoping to have took my test this week, but my 16 yr old had a date with a girl who brought along Covid-19 as a 3rd wheel. He's ok, but the family is locked down until further notice. Anyway, it gives me time to try to figure out something I'm having problems wrapping my head around...DMR. I've pretty much figured a out Analog on my uv5r and uv82. But now, I have a Anytone at878uv, and to be honest, this DMR is a whole new ballgame. The biggest issue is that I'm trying to listen in on some digital transmissions, but I'm not having any luck setting up the ht to listen. Now I know I need a digital id (and a license to get that) to do any serious operations. But for right now, Id like to listen like I do on analog. So, if anyone knows of a website, video, or anything else that can help me set up my ht for just listening, (or any advice) I've got a couple weeks to kill. Thanks.
    0 replies | 33 view(s)
  • brandon lind's Avatar
    Yesterday, 20:48
    I'll be adding the skywave linux ISO to my usb stick. I have a 256GB thumb drive partitioned into two 128GB parts, one NTFS and the other Ext4. I have Easy2Boot on the NTFS partition with all my essential ISO images which works really nice. I have both the win7 and win10 installers and a few linux iso's on there. I think I have mint 18 something, one of the chirp iso's and some linux server one ive never tried. Ill be adding it to that. Its really nice having a menu to choose iso's from pre-boot. That Ext4 partition is what I use to save things to and install necessary packages from when Im running a non-persistent iso, works great! Did you get the HackRF One? I've been itching to get my hands on one, just cannot afford it right now. Let me know how you like it when you get it figured out!
    3 replies | 80 view(s)
  • DanielW999's Avatar
    Yesterday, 17:31
    You can only install it as a Live User system that is read only. There is no option for a full install. I don't understand why it is set up that way, but you can install it as a persistent drive. Let me know if you have any problems or questions and I'll try to help. I'm new to SDR and just bought the HackRF hardware.
    3 replies | 80 view(s)
  • brandon lind's Avatar
    Yesterday, 17:18
    Does anyone know the programming protocols Motorola used on the old SM50 and GM300 radios? I ordered some of those USB to UART modules and have been having a ton of fun making them talk to each other with a C# windows form app and was hoping someone knew the digital ins and outs of the Motorola programming interface. I have several Motorola radios and, once upon a time, I had software to program them. Every time I tried since 2005 (even on an XP machine like I used before), these radios just dont want to talk to the Motorola software. I ended up giving my cables to someone else thinking they were no longer useful to me. I later found out that the software is not backwards compatible and using an older version software to program a radio that used a newer version software, the older software no longer works. I never did find the software I had used originally and everything online seemed to not work. But now with these serial communication chips, id like to take a shot at making my own programming software ~...
    0 replies | 45 view(s)
  • brandon lind's Avatar
    Yesterday, 16:48
    downloading it now, thanks for pointing it out!
    3 replies | 80 view(s)
  • DanielW999's Avatar
    Yesterday, 04:16
    Is anyone using Skywave Linux?
    3 replies | 80 view(s)
  • BansheeX's Avatar
    Tue 20th Oct 2020, 17:43
    BansheeX started a thread ZS6BKW HF Antenna in Antennas
    Hello, I have decided to go with a ZS6BKW antenna. I'm looking for any suggestions on how to set it up. Years ago I used a G5RV off the top of my tower as an inverted V and it worked great, as I had a lot of room for it. Currently our property has lot's of tall trees, limiting how I can set it up. What do you folks recommend as far as antenna orientation? Also it seems like there will be a lot of ladder line, and coax left over. I think the legs are 45' on each side, and the ladder line, and 80" of coax. Any suggestions are welcome. Thanks Don KB7KUH
    0 replies | 94 view(s)
  • pctech101's Avatar
    Tue 20th Oct 2020, 15:27
    pctech101 replied to a thread Base Radios FT-450D finals test in Yaesu
    I'm grateful for your words! Have blessed days ahead.!
    7 replies | 352 view(s)
  • brandon lind's Avatar
    Mon 19th Oct 2020, 23:43
    Update: I took a closer look with the oscilloscope and there is a ton happening in the kHz region. There are 24 bit data streams running at a rate of about 1.6Mbps separated by about 45microsecond timing pulses. There is also a 24MHz CW signal that is both duration and dc offset modulated throughout everything. It seems that the camera control signals fit into a 2.6ms period between 64ms of many digital video frames (still separated by the 22kHz timing signals). Now I have no clue about digital television signals but I need to learn because I just saw something very cool....... That video portion I mentioned, I zoomed in on one of the 22kHz spaced data portions and watched it as the girlfriend walked in front of the camera (scope tee'd into the video stream) and could see where in the camera view she was (left to right) on the oscilloscope trace! The change in the data chunk corresponded to where she was! Long story short, I have my answer. My capacitor must be big enough to pass that 22kHz timing...
    1 replies | 156 view(s)
  • KF7YVY's Avatar
    Mon 19th Oct 2020, 15:25
    Just FYI what I'd propose is I'd bring the kit over to your house, you key your transmitter, I align the IF and do some other little thing, I forget what. But it would probably be a couple hours max.
    1 replies | 115 view(s)
  • brandon lind's Avatar
    Mon 19th Oct 2020, 03:07
    I recently bought a set of 5MP wired security cameras (Night Owl brand) and wanted to have a camera at the end of the driveway. It is about 200 feet. I homebrewed up a set of bias tees to run the DC power over the coax so I didn't have to run extra wire and ran into a mystery. The cameras use a single BNC connector for the video and have an NTSC sticker on them. I jumped on wiki and assumed the frequency was around 4MHz so I made the bypass capacitor a 1nF (102) ceramic cap in both tee's. No signal through them. Without DC bias, shorting the capacitor allowed the signal to pass through. I tried cap after cap until I had a reliable signal through the tee. The value I ended up with was 100uF electrolytic. This is when I got really puzzled and connected the camera directly to my spectrum analyzer. There is a broad peak around 6.1MHz and another with several sidebands at 24MHz. Now im even more puzzled because that 102 cap should have done just fine at a higher frequency. Along with the 6.1MHz signal, there was...
    1 replies | 156 view(s)
  • XE2XEH's Avatar
    Mon 19th Oct 2020, 02:16
    Recently, I bought a Baojie BJ-318 (25W, 10W, 5W) to install in my truck in substitution of my old Motorola SM-50 (50W). The package include the radio equipment, power cable, bracket, mic and programming cable, without programming software. I has attempt configure it with Chirp but I feel that the configuration is so limited to Channel Names and Memories. I need to solve a problem related with a behavior in A display. When I transmit on A to the repeater, the Downlink frequency is no listened several minutes after beginning transmission. I can still to transmission but I can't listen anyone. I think that any option is programmed but I can't see that is because I haven't the software. I has attempted search the software but is not available on the Internet. Please, if you have it, share it!
    0 replies | 93 view(s)
  • XE2XEH's Avatar
    Mon 19th Oct 2020, 02:01
    I bought a Baojie BJ-318 with programming cable. My problem is that the package doesn't include Programming Software. I have the same problem. I had configure the repeaters frequencies of my location but when I attempt a communication, the radio doesn't listen nothing in the A frecuency (147.180 MHz) but still transmitting on 147.780 MHz. If I want listen the responses, I need put the 147.180 frequency on B. What can be? If is possible, please, give me an URL where I can download the BJ-318 programming software. Chirp is so limited to configure and check that fails. I think that I need to send the radio with an electronic radio technician to check it. Will be cheapest that back to "home". 73, Thanks in advance! Fabian XE2XEH
    5 replies | 4610 view(s)
  • BansheeX's Avatar
    Sun 18th Oct 2020, 21:51
    Hello all. I'm KB7KUH and I have been a Ham General class for 25+ years. Finally getting back into it, and waiting for Equip to arrive. I see there has been a lot of changes since I have be involved it the hobby, I have worked Satellites, MIR (long time ago) was in Navy MARS. Looking forward to getting back up and running. I think I might have a challenge setting up a antenna. Surrounded by tall trees, and a hills on 2 sides. Should be fun lol. 73's Don
    0 replies | 71 view(s)
  • brandon lind's Avatar
    Sun 18th Oct 2020, 15:19
    brandon lind replied to a thread Base Radios FT-450D finals test in Yaesu
    The particular model meter you have can only check diodes up to 2v. Therefore, I doubt it would provide enough voltage to charge the gate capacitance enough to turn on the mosfet. Meters that run on a 9v battery are much better suited for testing mosfets using the diode setting. The results you got with the ohms setting having the gate shorted to source are just as informative. Hopefully you get that new mosfet in and the radio running. Just wanted to add this to explain the strange results you got using the diode setting. 73! Brandon
    7 replies | 352 view(s)
  • N7CXI's Avatar
    Sun 18th Oct 2020, 07:43
    Hello, I know this thread is old, but I have a friend with one of these rigs and he needs help with this issue. Did you use the original transformers? Thanks! Jim N7CXI
    26 replies | 18370 view(s)
  • KF7YVY's Avatar
    Sun 18th Oct 2020, 02:48
    Coming back to an old Ten-tec 1340 transceiver kit. I got a lot of it built but stalled out on it because it wants you to have another radio to use for alignment/tuning and I don't have another radio. Anyone out there in the Phoenix area that might be able to help me? Thanks. KF7YVY
    1 replies | 115 view(s)
  • Tom7020's Avatar
    Sun 18th Oct 2020, 01:54
    What article did they say they were illegal for use on MURS? There are large gaps in my memory, so its possible its lost, or never known. I feel as though it used to be legal as long as it was low power. MURS does not have the antenna restrictions of frs/gmrs and as long as used below the two watt restrictions was legal, to my memory. If ove missed something I must apologize. Many things are gone, so I am learning/relearning things all the time. Sent from my SM-S767VL using Tapatalk Included in Part 95 of the FCC rules (Personal Radio Services) along with the more familiar services such as CB, FRS, GMRS, etc. Since it is a VHF CB service, MURS fills the gap between the UHF FM services (FRS/GMRS) and the original "Class D" HF AM/SSB 26-27 MHz CB service. According to the FCC, the MURS (Multi-Use Radio Service) is a private, short-distance, two-way data or voice communications service that civilians can use. This is mostly used for personal or business activities. MURS stations cannot legally be...
    14 replies | 9910 view(s)
  • N4TDT's Avatar
    Sat 17th Oct 2020, 15:06
    After 55 years of thinking about it I took the time this summer to study and get licensed. Studied answers (more than theory) and easily passed technician and general exams. Iíve unboxed my Yaesu FT3D and started to look through the manual and some YouTube videos. Prior to getting licensed I had remembered ham radio from the days of my youth where guys in the neighborhood were simply talking (voice) to others, near and far away. Now I discover that ďdigitalď seems to be at least equally important, and itís even somewhat confusing that the things I easily do on the computer (quite proficient on Mac and Windows) can be done via radio. Things like C4M/FM /DG-ID, WIRES-X AND APRS will require some study time to figure out. So for this first post Iím welcoming ideas of where to start and resources to use in embarking on this hobby. I know thereís a rich and deep group of Hams back home (Sarasota) which I know will be helpful but for the next month while weíre still in our motorhome Iím curious on ways to...
    0 replies | 108 view(s)
  • Cundy66's Avatar
    Fri 16th Oct 2020, 08:44
    Hello Iím Tom, I am currently waiting for a online course to start next week, Iíve began the cross over from listening to start the journey to transmit, I am nervous about it as I have only ever spoken over the radio when I was doing flying lessons (that stopped when kids took the money, over 7 years ago 😂). Iíve ordered my foundation book and a Baofeng UV5R III. I am wondering what advice people have and also what licence free frequencies I can use in the mean time that I can practice and build confidence in using the radio? Thanks
    0 replies | 142 view(s)
  • pctech101's Avatar
    Thu 15th Oct 2020, 22:13
    pctech101 replied to a thread Base Radios FT-450D finals test in Yaesu
    I was testing it with a small digital radioshack multimeter (catalog# 22-820). It has a button to select diode, continuity w/sound and ohms. The first tests I was doing it in the diode mode. THe leads are soldered to the board. I'm confident they are correct. Thanks for the explanation ^^^^
    7 replies | 352 view(s)
  • brandon lind's Avatar
    Thu 15th Oct 2020, 18:27
    brandon lind replied to a thread Base Radios FT-450D finals test in Yaesu
    ...and be sure to wear a grounded wrist strap when putting the new mosfet in. That thin layer of oxide can be damaged by anything over (for that model) 50v. That means a static discharge from your finger so small you don't even notice will destroy the mosfet. And that isnt the only mosfet in that radio, there are much smaller ones! if you dont have one, touch something that is earth grounded nearby each time you handle the part or radio until the cover is back on. If your local humidity is really high, its not such a big deal, but if it is dry there, be very very careful!!!
    7 replies | 352 view(s)
  • brandon lind's Avatar
    Thu 15th Oct 2020, 18:04
    brandon lind replied to a thread Base Radios FT-450D finals test in Yaesu
    My multimeter has 2 functions on the diode setting. By default it is measuring capacitance until I press the select button and change it to diode. Because I am unfamiliar with your particular meter (you should tell me the model), I am unsure if the F in .0F means Farad (telling me you have it in capacitor mode) or if it is some foreign abbreviation for overload. If your probes are plugged into the meter wrong (red in negative, black in positive) you could see this result. Check that. Yes. At 12ohm, that bugger is toast. Crash course in mosfets... MOSFET stands for Metal Oxide Semiconductor Field Effect Transistor. The metal oxide part means there is a microscopic layer of oxide insulating the gate from the rest of the device. There is no conductive path between the gate and the rest of the pins. Field Effect tells us that it is the electric field on this gate surface that influences the conductivity of the junction between the source and drain, but without directly connecting to it. It is...
    7 replies | 352 view(s)
  • Tom7020's Avatar
    Thu 15th Oct 2020, 13:31
    Tom7020 replied to a thread Mobile Radios Cross Band repeater mode with TM-V71A in Kenwood
    I had originally purchased a similar TM-V71A. This one works perfect, first try. The way the v71a works is a little slow (plus 1000 memories is going to take a while!) but man it's a lot better than hand-programming things.
    3 replies | 2774 view(s)
  • pctech101's Avatar
    Wed 14th Oct 2020, 20:01
    pctech101 replied to a thread Base Radios FT-450D finals test in Yaesu
    When I follow this exactly nothing show, just .0F But if I swap the black and red leads I do get a reading of of .550 I attempt the above and I get nothing to happen when the Black lead is touching Source. Only time any readings happen is if I put Red lead on Source. Am I to understand that shorting Gate to Source should remove the voltage on the Gate? And that if their is resistance (by getting a reading of OHMs) that it is junk? So I shorted Gate to Source and remove short.
    7 replies | 352 view(s)
  • brandon lind's Avatar
    Wed 14th Oct 2020, 18:45
    brandon lind replied to a thread Base Radios FT-450D finals test in Yaesu
    Mosfets can usually be tested with a multimeter by using the diode setting. You will first need to take a look at the datasheet https://www.mitsubishielectric.com/semiconductors/content/product/hf/sirfpowermosfet/siliconrfdiscrete/siliconrfdiscrete_lv4/rd100hhf1.pdf and identify the gate, drain and source pins ~ looks like you have done that already... Then, with the mosfet sitting on a nonconductive surface (and the meter in diode mode - not ohms), touch the negative probe to the source and touch the positive probe to the gate. This charges up the gate capacitance. Now, while continuing to hold the negative to the source, move the positive probe to the drain. You should see the meter show a low voltage reading that slowly climbs as the gate loses its charge. Then, to turn the device back off, leave the positive probe on the drain and take the negative off the source and touch it to the gate. Now the meter should read overload (no voltage) when the negative probe is returned to the source. Another...
    7 replies | 352 view(s)
  • pctech101's Avatar
    Wed 14th Oct 2020, 01:29
    pctech101 started a thread Base Radios FT-450D finals test in Yaesu
    My uncle gave me his non working FT450D. He told me the finals are bad. He stated one of his HAM friends looked at it and said that was the case. It supposedly turns on. I see the finals only for about 40 before shipping. I am hoping to test the finals before blindly purchasing. Hoping to not have to take to a repair shop. I pulled the finals. RD100HHF1 Is it possible to test with a multi-meter? With positive on Source and Negative on Drain using Diode/Ohm I get a reading on both finals of around .710
    7 replies | 352 view(s)
  • Tom7020's Avatar
    Tue 13th Oct 2020, 14:10
    I'm meeting the same problem too ??? I could not find the way resolve, damn it!!! :blue::blue::blue: reply if u found the answer plsss many thanks :redface-new::redface-new::redface-new:
    1 replies | 2223 view(s)
  • DanielW999's Avatar
    Sun 11th Oct 2020, 17:24
    DanielW999 replied to a thread ground rods in Amateur Radios
    Good suggestions, Thanks!
    12 replies | 666 view(s)
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