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  • Feenone's Avatar
    Yesterday, 21:51
    Hello Iíve joined the forum cos Iím after some advice. I got my foundation license a couple of years ago and Iíve not done anything with it. I got hold of a baofeng but couldnít make contact with anyone. Iím not available to go to the local club and canít afford more advanced equipment. Could anyone suggest ways I could keep my hand in? Books I can read, stuff I can do with the baofeng? Thanks in advance.
    0 replies | 4 view(s)
  • brandon lind's Avatar
    Yesterday, 20:37
    My friend told me I should learn C#, php, and html in visual studio... i should have listened to him. If I had the knowledge, Id gladly help out on the forum. I once used excel to utilize photos and audio clips for encrypting strings of text in a one-time pad fashion but I just don't have the time to get serious with coding. If that day ever comes, I will toss in an application on the forum ! Hope everything is going well for the code monkey.
    2 replies | 119 view(s)
  • 5B4AJB's Avatar
    Yesterday, 16:02
    I think our code monkey is on extended leave for the time being. Linking to external sites is allowed, however, their long-term reliability seems to vary, some being acquired by other companies, terms & conditions changing etc.
    2 replies | 119 view(s)
  • brandon lind's Avatar
    Yesterday, 15:31
    brandon lind replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    The mic does work now, correct?
    11 replies | 253 view(s)
  • JDT's Avatar
    Yesterday, 11:08
    JDT replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    Try to post picture again... Let see if this works!
    11 replies | 253 view(s)
  • brandon lind's Avatar
    Yesterday, 05:23
    brandon lind replied to a thread Base Radios ICOM -725 - fault after storage in Icom
    Do you mean it works out of band, but not in band? That's really odd...
    1 replies | 91 view(s)
  • JDT's Avatar
    Yesterday, 03:52
    JDT replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    Thank you Brandon! 1. As per email, I did clean black outer around the yellow wire to expose the yellow on the mic socket side. 2. I will do the cap now again, I had it the wrong way around! 3. Can the forum moderators assist to get that photo up! That is what this is all about! See, even up to the end even using and testing the mic... I still did something wrong! Never be too sure of yourself! With kindness and gratitude to Brandon! de Johan
    11 replies | 253 view(s)
  • brandon lind's Avatar
    Yesterday, 00:41
    brandon lind replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    I altered the picture you sent me in a photo editor to show the proper wiring and emailed it back. I tried to post the picture here but I am out of storage space on this forum (hoping the admins can help with that). Just be sure to have the positive side of the capacitor facing pin 1 (the cap - stripe facing the mic) or the capacitor will very rapidly turn into a bad version of a resistor and damage the dynamic mic's coil.
    11 replies | 253 view(s)
  • brandon lind's Avatar
    Yesterday, 00:21
    Is there a way for the admins to allow a bit more attachment storage on this site? If we post a schematic, picture or other useful thing, our 4 or 5MB limit is rapidly consumed. This means we must delete prior attachments before adding new ones and this kills the old thread attachments that others might find useful.
    2 replies | 119 view(s)
  • brandon lind's Avatar
    Wed 22nd Jan 2020, 15:45
    brandon lind replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    The problem with using wire colors and terms like that is that it creates the possibility for us to mislead you by accident. For example, audio could mean audio out or audio in, the radio's mic jack supports both. RX could mean a variety of things based on microphone. Some radios require an RX pin to be grounded for the receiver to function ,whereas some radios consider RX at the mic jack to be audio out for a speaker built into the mic. Either way, I doubt it means ground for the TX (PTT) switch. The way you to describe the situation leaves too much ambiguity. The difference between microphones is as follows. A dynamic mic is one that most closely resembles a speaker ~ it has a diaphragm, pickup coil and magnet... a speaker in reverse. A condenser microphone is essentially a large surface area capacitor with an external voltage applied between the plates. When pressure waves from sounds in the air hit one of the plates, the capacitance changes superimposing an ac voltage on the DC plate voltage. An...
    11 replies | 253 view(s)
  • MikeAlex's Avatar
    Wed 22nd Jan 2020, 13:05
    MikeAlex started a thread Base Radios ICOM -725 - fault after storage in Icom
    Hi, Recently powered up my trusty (it was) IC-725 after it has been in storage, at room temp. in my indoor shack, now I find that it is not functioning within the limits of the bands of Region One - Europe, CIS & Africa. After performing a full test (on dummy load)I see that it not functioning to either Region 2 or 3 either but transmitting over a broader range than the ham bands. My first thought was that the diode D5 was probably open circuit - this I recall was the mod known as the 'MARS mod' which has been around awhile. My rig has never been modified - I bought it new to UK spec. However D5 is perfect, tested in situ it shows a typical forward resistance of 435 ohm with a suitably high reverse. I know that manufacturers often used a diode matrix to determine the market destination of equipment and wonder if that is the case with the IC-725 or are the band settings pre-determined in the microprocessor. I note that there are three other diodes associated with the microprocessor and three blank spaces...
    1 replies | 91 view(s)
  • JDT's Avatar
    Wed 22nd Jan 2020, 05:12
    JDT replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    Thank you sir! Old saying... I don't know why... but just do it cause you have to. My English is poor, so I googled terminology. What is a dynamic and electret mike. The new mike I wired on my 735 is a dynamic mic. I found some other write-up on fixing a standard mic to a Icom 720. The pin out on the 720 is not the same as the 735. In a moment you see... read why... He wrote..." Connect the audio wire to pin 1. Connect the TX to pin 6 and the RX to pin 5 and pin 7 screen." The standard mic for the 735, uses the exact same pins, but pin 5 and 6 must be swapped around... as if you wire as above, the radio go into transmit the moment the mic get plugged in. This is how to wire... I can't post a pic... so, use your imagination. The colors I'm using is for visual reference and as it was mentioned before... colors are different by manufacturer.
    11 replies | 253 view(s)
  • brandon lind's Avatar
    Tue 21st Jan 2020, 23:03
    brandon lind replied to a thread Base Radios Yaesu FT-900 with no Power output in Yaesu
    If you have the FT-900AT, there could be an issue in the tuner section assuming the tuner is turned on. If not, the last thing would likely be the TR relay (RL5014) or the coax to the ANT port. If the TR relay is clicking , see if power gets through that (if so, test the cable to the ant jack for continuity). If its not clicking, it might be a bad electrolytic capacitor (C5055) for the TR relay control signal buffer (Q5001) that supplies the relay coil with a ground path. If the TR relay is not clicking, also test to see if J5001 has 12v+ on pin 1.
    8 replies | 1989 view(s)
  • K6CPO's Avatar
    Tue 21st Jan 2020, 19:56
    It's probably physically possible to program MURS frequencies into your Baofeng, but you're getting into legality issues. The FCC regulations prohibit the use of non-type certified radios on radio services such as FRS, GMRS and MURS. It is very likely your Baofeng does not carry the necessary certification to be used on MURS. It's not something I would recommend.
    1 replies | 77 view(s)
  • AB6WP's Avatar
    Tue 21st Jan 2020, 19:53
    AB6WP replied to a thread Base Radios Yaesu FT-900 with no Power output in Yaesu
    Finally got hold of an oscilloscope and performed the alignment procedure as per the service manual up to the point where there was a need to key down on CW and measure power. As expected, nothing came out. Measured the input to the power amp to be 100 mVpp and the output of the PA over 100 W going to the LPF, but nothing out of the RF connector on the back. I can see several relays clicking on the LPF pcb as I change bands, but still no power out. For a moment suspected the logic that selects the various relays but the fact that the problem persists in all bands, tells me that the cause is common to all the relays (thus ruling them out) and the LPF. I am now still tracing the RF signal into the SWR meter circuitry and T/R relays. Believe am looking at the last square inch where the problem is.
    8 replies | 1989 view(s)
  • brandon lind's Avatar
    Tue 21st Jan 2020, 18:57
    brandon lind replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    16v should be fine
    11 replies | 253 view(s)
  • JDT's Avatar
    Tue 21st Jan 2020, 08:01
    JDT replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    I'll try and post a photo.... hope this works. Maybe just a question on the voltage on the 1 uF cap. The mic I got with the 735 is from a 2 meter Icom rig with DTMF code buttons on the rear. Horrible mic! I tried posting before this one... but it didn't show. Sorry, I have difficulty navigating the forum. I'm still not sure wiring a regular mic. Maybe someone can guide me to some other site for help. Thanks.
    11 replies | 253 view(s)
  • brandon lind's Avatar
    Tue 21st Jan 2020, 03:51
    brandon lind replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    K7MEM, good catch on the capacitor value! I grabbed the value from the circuit diagram of the HM12 in the service manual which is clearly not correct. At 200Hz, that's about 1700ohms reactance, far too many ohms! You are 100% correct on 1 to 3uF!
    11 replies | 253 view(s)
  • k7mem's Avatar
    Mon 20th Jan 2020, 22:57
    k7mem replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    JDT, I have a IC-735. The intended microphone is the HM-12 or SM-8, but I use the SM-2 desk microphone or sometimes my D-104. Both of which are amplified. The wiring of the microphone for the IC-735 depends on what mike you choose. The wiring of the microphone connector is detailed in the manual. Pin 1 - Mic Input Pin 2 - +8V Output Pin 3 - Freq Up/Down Pin 4 - NC
    11 replies | 253 view(s)
  • brandon lind's Avatar
    Mon 20th Jan 2020, 21:28
    brandon lind replied to a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    Looking at the diagram it would appear that a standard spst momentary switch between pin 5 and 6 (6 being ground) would activate TX. The mic utilizes pins 1 and 7 (7 being shield, 1 being audio). It also looks like pin 1 (that carries the microphone audio) is DC biased to power the stock microphone. If you use a dynamic microphone (typical of CB mics), you will need a .47uF capacitor in line with pin 1 (positive side of the capacitor facing pin 1 or it will eventually fail) to block the DC voltage that otherwise powers the stock electret mic. The mic jack input impedance is 600 ohm, try to match that with the replacement mic you choose. The type of microphone you substitute will determine how you wire it. Do you intend to use a dynamic mic or an electret mic?
    11 replies | 253 view(s)
  • Ali.Yusufaly's Avatar
    Mon 20th Jan 2020, 20:09
    Hello Everyone. I am new to HAM radios and just received my technical license yesterday. I run a business that uses Motorola RMM2050 VHF MURS radios for communication on site with multiple sites using the same radios. I wanted to find out if its possible to program my Baofeng UV82 radio to work with the Motorola radios since I will be carrying my Baofeng in the car with me on a day to day basis. I would really appreciate any help anyone can offer. Since I am new, I am still trying to figure out the world of HAM but am excited to learn. Thanks!!!
    1 replies | 77 view(s)
  • JDT's Avatar
    Mon 20th Jan 2020, 18:11
    JDT started a thread Mobile Radios Mic Pin-out Icom IC 735 in Icom
    Hi friends. New to this forum and a BIG question! I recently got a Icom IC 735 in working condition, but looks terrible. I feel to disinfect my hands after touching the mic! Not the original, but a Icom HM-56A. Let me not describe how disgusting the mic looks! I downloaded the PDF manual but struggle to figure the pin-out. In short, I want to place a regular standard mic without up or down buttons on it... Similar to a regular CB mic. One of 2 ways... keep the old disgusting cord, or just change the 8 pin plug to the new standard mic cord. As I understand... Pin 1, Mic input, 2 open, 3 open, 4 open, 5 PTT, 6 PTT ground connected to 7 Mic Ground and Pin 8 ....? Normally looking at the PTT switch 6 pins, Top left, Yellow, Middle, Mic insert red, top right open... Opposite those bottom row.................Bottom left, Red, Bottom middle Screen+ insert black and bottom right Blue. Having said this... On the Icom plug, I assume... NOT SURE, pin 1 Yellow, 2 open, 3 open, 4 open, 5 Red, pin 6 and 7...
    11 replies | 253 view(s)
  • W6TZI's Avatar
    Sat 18th Jan 2020, 09:46
    160/80/60/40/30M Vertical DX Antenna The 80M antenna is essentially a dipole, with the coax center conductor going to the vertical element via a trimming coil and the coax shield going to the radial element via a trimming coil. The trim coils adjust the electrical length of the elements. There is a current balun between the radio coax and the antenna connections. 1/4 wave on 3.5 mhz is 8' longer than 1/4 wave on 4.0 mhz. My ground mounted antenna is 55' high and has 5' of wire to connect to the trim coil, which is tapped at 2.6'. My target frequency is 3573 and with some patience and a antenna analyzer I can trim my antenna for a SWR of 1.0:1. My trimming coils are 22 turns of #18 bare copper wire wound on a 1" PVC form, roughly 4 turns is equal to 1'. I am using good quality alligator clips to trim with and have never had a problem, even on 160, but I only run 50W digital. My radial started out 1/4 wave long but it has been chopped on, my 80M ant tap is on turn 10 of the trim coil. The...
    0 replies | 150 view(s)
  • KM6TMK/LBC's Avatar
    Fri 17th Jan 2020, 18:11
    Living on 12th floor, appx 150 feet up. Must use an EF-random, 100 feet for 80 meters and 50 feet for 40 meters. How long the counterpoise?
    0 replies | 125 view(s)
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