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  • k7mem's Avatar
    Today, 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
    2 replies | 26 view(s)
  • brandon lind's Avatar
    Today, 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?
    2 replies | 26 view(s)
  • JDT's Avatar
    Today, 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...
    2 replies | 26 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 | 108 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 | 94 view(s)
  • sataustralia's Avatar
    Fri 17th Jan 2020, 15:02
    That is my user name from a forum I used to manage in a German magazine called Tele Satellite, some years ago. I have three dishes on my roof 5m, 3m and 2m. Including other smaller dishes for TV satellite work. The 5m is great for tracking amateur satellites and has a reasonable gain. My main interest is foxhunting and amateur television. Hence the callsign VK5TV.
    0 replies | 76 view(s)
  • 5B4AJB's Avatar
    Wed 15th Jan 2020, 16:12
    5B4AJB replied to a thread New Around in Introduce yourself
    Greetings and welcome!
    1 replies | 189 view(s)
  • erssntenna's Avatar
    Wed 15th Jan 2020, 14:52
    Hello im just new around thanks catching up with the latest update :distracted:
    1 replies | 189 view(s)
  • WZ7U's Avatar
    Tue 14th Jan 2020, 00:09
    WZ7U replied to a thread OTR HAM in Mobile Operating
    I did HF/VHF when I ran the three window office cross country. Lots of fun and a great way to pass the time. Got my first EU in the logs on 20 when I was on the East Coast. Had a route that put me through Northern OH and loved the repeater qsos through there. Always wanted but never did a screwdriver off a grab handle, used tuned whips for 75, 40, 20, 2 & 70cm off the old school mirrors of yesteryear. Still the most fun mobile platform IMO. Enjoy!!
    2 replies | 243 view(s)
  • kc5fm's Avatar
    Mon 13th Jan 2020, 14:21
    kc5fm replied to a thread OTR HAM in Mobile Operating
    Hope you will enjoy some simplex radio frequencies in your trips. 73 Lloyd, KC5FM
    2 replies | 243 view(s)
  • kmiller513's Avatar
    Mon 13th Jan 2020, 00:44
    kmiller513 started a thread OTR HAM in Mobile Operating
    I just put a Icom 7100 in the truck,and have been programming in repeaters in the areas the i have been doing most of my traveling.Hope to make contacts with some of you soon.I run in the between Ohio and Texas mostly.KD8OBA
    2 replies | 243 view(s)
  • brandon lind's Avatar
    Sun 12th Jan 2020, 18:24
    brandon lind replied to a thread NanoVNA in Accessories
    I ordered the nanoVNA-F for $126. One issue is that it said it ships from the usa. The tracking said its shipping with DHL but the tracking number is not recognized by the DHL website. The tracking number starts with a 9 so i looked it up on USPS. The number registered but said they have yet to receive the package. Unfortunately, when something says it ships from the USA, that actually means it ships from the USA once it gets here from China. This seems to be a common trend lately and I am becoming more and more disappointed with amazon and ebay for allowing this deception to go unchecked.
    2 replies | 269 view(s)
  • Tempstar's Avatar
    Sun 12th Jan 2020, 14:51
    Tempstar replied to a thread NanoVNA in Accessories
    We have a $60,000 dollar VNA at work, and I have a nano as well. There is no comparison to the capabilities, but the nano is within a few points of accuracy of our R&S. Well worth the $72 asking price for Ham use.
    2 replies | 269 view(s)
  • Tempstar's Avatar
    Sun 12th Jan 2020, 14:28
    Tempstar replied to a thread Base Radios TS480HX transmitting issues in Kenwood
    That looks like a low power reset to me as well.
    3 replies | 225 view(s)
  • OH8GAD's Avatar
    Sun 12th Jan 2020, 08:41
    What we now use is a tape measure with contact on the end. When it hits the water surface, a box at the other end of the measure goes "Beeeeeeep!" Then again, I could always try and sell you one of our environmental monitoring stations that would monitor the water level, give you the measurements online and send an alarm if the level gets too low or too high ;D
    5 replies | 266 view(s)
  • brandon lind's Avatar
    Sat 11th Jan 2020, 20:18
    brandon lind replied to a thread Base Radios TS480HX transmitting issues in Kenwood
    I think K7KBN's suggestion will prove the radio is just fine. A quick look online shows that is a 200w radio with split finals having separate power supplies and that the radio requires 41A of current (if using one power supply to run the radio). Id bet its shutting down to protect the radio from damage. I think you will need to pigtail both DC1 and DC2 when using one PSU or if you are using two, make sure they are within a volt of each other.
    3 replies | 225 view(s)
  • brandon lind's Avatar
    Sat 11th Jan 2020, 17:56
    Good to know! I used a fishing line, bobber and sinker to to check our well by feeling when the bobber took on the weight of the sinker. At least this emissivity thing can be readily corrected for. Luckily, it seems to be accurate pointing it at water, which is one of the main reasons I bought it. I should have bought one that can be programmed. Unfortunately, I dont think I will be using it on my glass distillation apparatus or on my hotplate testing salt melting points without some prior testing. Maybe a spot of soot or something other than tape will give me a decent target to check hot surfaces. Lesson learned lol!
    5 replies | 266 view(s)
  • OH8GAD's Avatar
    Sat 11th Jan 2020, 17:38
    At work, we had one of those laser range finders. One of the guys bought it with the idea that they could measure the surface height of water in wells and bore-holes, instead of dropping a tape measure down. It worked fine on most solid objects, but failed miserably on water :)
    5 replies | 266 view(s)
  • brandon lind's Avatar
    Sat 11th Jan 2020, 17:33
    Thank you! I missed emissivity day in school! New plan... I am going to buy various rolls of black tape and see which one is closest to E=0.95 (what this IR is calibrated to) so I can just toss a piece of tape on whatever it is I'm commonly measuring, otherwise, this $25 was a total waste. I guess I will have to get a new thermocouple for my DVM and go around with dabs of thermal paste if I ever want accurate results.
    5 replies | 266 view(s)
  • Psi*'s Avatar
    Sat 11th Jan 2020, 12:02
    In a word, emissitivity Simply put, infrared thermometers must be calibrated for the material they are measuring.
    5 replies | 266 view(s)
  • K7KBN's Avatar
    Sat 11th Jan 2020, 05:55
    K7KBN replied to a thread Base Radios TS480HX transmitting issues in Kenwood
    Try using an automobile battery (around 12 - 13 volts) to see if the radio faults. It might even be a good idea to have the vehicle running to keep the battery from discharging too much.
    3 replies | 225 view(s)
  • brandon lind's Avatar
    Sat 11th Jan 2020, 04:17
    Prepare yourselves for what might be a totally dumb question! I am posting this non-radio question because it is electromagnetically involved, and although it has nothing to do with radio communications, I think there are enough smart people here to give me the DiNozzo treatment and show me what I'm missing here. Setting the stage: Its a perfectly calm night with clear skies and -9F outside. I have a brand new infrared (laser sighted) thermometer with a temp range of -56F to 718F having an alleged accuracy of 2.7F. In and around the house, the device performed absolutely amazing. Everything it showed was on par with the digital wall thermometer and my highly accurate distillation thermometer. So far so good. I shouldn't have, but I went outside and started pointing it at things... My outer wall reads -17F and both my trucks (measured on the fender) and snow plow blade read -46F. Now, I know there is a difference between air temps at certain heights above ground and differences in surface...
    5 replies | 266 view(s)
  • neflyfisher's Avatar
    Fri 10th Jan 2020, 16:57
    neflyfisher started a thread ATAS 120 in Antennas
    Does anyone have experience grounding this antenna to a 2016 Nissan Frontier?
    0 replies | 160 view(s)
  • 5B4AJB's Avatar
    Fri 10th Jan 2020, 14:58
    Greetings and welcome!
    1 replies | 123 view(s)
  • z34pec's Avatar
    Fri 10th Jan 2020, 08:43
    z34pec started a thread Base Radios TS480HX transmitting issues in Kenwood
    Hello. Recently from a friend I purchased TS-480HX radio. I connected to my longwire antenna and MFJ 971 ATU. I must say I had 2 PSU's capable of giving 20Amps and both are used on my Icom 706 MKII radio without any problem. When in ssb mode max given current that is shown is around 10-12 amps so I suppose both psu's are working well (Icom 706 MKII). In RX mode it works well, good sensitivity, but... When in TX mode , TS480HXI had issue of resseting of unit during or after TX (SSB mode). I tried everything and all I can get better is not resseting up to 60W, one PSU as a power supply and only in "setting mode" where I set my antenna SWR.
    3 replies | 225 view(s)
  • z34pec's Avatar
    Fri 10th Jan 2020, 08:22
    Hi, My name is Petrika, operator call sign Z34PEC. You can find my info at qrz dot com. 73 de Z34PEC
    1 replies | 123 view(s)
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