Icom IC-7300 & DIY coaxial vertical dipole for 4m: super audio on FM
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- เผยแพร่เมื่อ 8 ก.พ. 2025
- Hi there, following on from my previous video describing my new DIY coaxial vertical dipole for 4m, here's a good example of the audio using it with my IC-7300 as I chat to a fellow Harwell ARS member about desk mics!
Thanks for watching.
Keep safe,
73s,
Clint, if you want to try something different and gain versatility, you can use an adapter for electret PC microphones, alongside an external PTT switch... That's what I do myself! The adapter is basically Y-shaped, with one end terminated in a suitable mic connector for the radio you want to use it with, and the other then splitting into: 1) a stereo 3.5mm jack socket for the mic, and 2) a mono 6.3mm socket for the PTT... In my case, I use a momentary handheld switch that I purchased alongside with the adapter, but it would have been just as easy to separately buy a male mono 6.3mm jack plug to put together either a 'non-momentary' desktop PTT (alongside some 2-conductor cable and a SPDT switch), or even a foot switch! The possibilities are quite endless, as they are in the case of the microphones themselves! I'm currently mostly using a cheap "Sonia SN-6000" desktop mic that I found, for simply €4.50, in my nearest Chinese "dollar store"-type outlet (and the reports I've received when using it have basically been always positive, so far!), but I can also use a Plantronics PC headset I also have, or even a cheap lav mic that came alongside a simple MP3 recorder I got several years ago (in an attempt to find a cheap solution to capture audio from my portables!)... All of them work with the adapter and my IC-7100! That being said, something has to be had in mind, and that's that there are two ways PC mics' jacks are wired, one of them is by using the tip of the jack for the audio, the ring for DC power up to the electret element, and the sleeve for ground, and the other way is by combining power+audio on either the tip or the ring, and again, using the sleeve for ground. So, I had to make an "adapter for the adapter", consisting of a short pigtail of cable (taken off a failed universal laptop charger, that happened to use a coaxially-arranged cable for the DC supply, good for "hum prevention" when used for audio!), a 3.5mm socket (in which I soldered both the tip and the ring contacts to the center conductor of that 'coax-alike', and the shield/braid to the sleeve contact), and in the other end, a 3.5mm stereo jack with the center conductor to the ring, the shield to the sleeve as well, and a small 1uF 50V capacitor in-between the ring and the tip of the jack (it just fits within the plastic cover for the jack!) to decouple the DC from the audio and place each of them on the correct contacts on the jack! Incidentally, I pulled that cap out of a PL-600 radio that I lost, due to an ESD zap from an outdoors random wire antenna I tried to use with it, but that's another story LOL!
I sourced both the adapter and the hand PTT switch off an UK-based seller (on eBay, but they also sell through their website), so you should have no problems to get those, if you decide to go down the same route! So, for your IC-7300, it would be:
-Adapter: shop.technofix.uk/microphones-and-accessories/headset-adapters/cable-for-pc-headsets-3-5mm-jack-8-pin-round-for-icom-transceivers
-PTT switches: shop.technofix.uk/microphones-and-accessories/ptt-switches (or like I said, you can make your own with just a 6.3mm mono jack & some cable!)
Anyways, I'd say I broke my record for lengthy comments LOL, but in this case I think it was justified! Hope it's useful, at least... As always, take care, Clint!! Off to watch today's edition of your "what I'm up to" videos!! :) 73!! David EA3IEK & EA4998URE SWL
Hi there David, thank you so much for your detailed recommendations - really interesting. Not bad at all for £25 by the way! Hope you enjoy the update vid. Keep safe my friend and 73s, Clint
That is true Jon, but M0UHF did periodically ask whether other operators wanted to use the frequency. 73s, Clint
@@OxfordShortwaveLog You're welcome, Clint! I really like how there are many ways to make significant improvements to our setups on the cheap! And yes, I enjoyed your latest update video, as I did with all the others you've made! 73!! David.
Excuse the intrusion Sir, but Dave is the man to consult he is a genius on the right mike and audio adjustment to sync perfect with the acceptable recognition of your voice over the Ham bands. Hope you don’t mind me saying buddy 👍 73s Tam.
Thanks my friend, I take that on board 100% ...he is the man, but so is Roger G0AOZ....always a stonking signal and audio from him. 73s, Clint
Oxford Shortwave Log Thank you 🙏 for your kind reply , and I never meant to question the nice guy who was helping you. I promise no more butting in from me promise 👍73s Tam.
good advice too
Thanks Tom. 73s
Oxford Shortwave Log enjoy watching your channel mate 73 from down under vk5faah
Hi and tnx for the clip. From one thing to another i must ask: You have this green kind of thin line on the top to your audio on the display (in the spectra, i can´t get that one on my rig, i use the Vers 1.41 (Cpu) Dsp data 1.00 Dsp program 1.07, if that has anything to do with it?
Hi sorry I can't answer your question as I sold my 7300 about a year ago. Google it perhaps? 73
Ok...bossku.
Thank you my friend, 73s
what is the power output on 4m with the 7300 ? ssb ? and fm ?
50W I think...
just press the transmit button if you dont want to hold down mike key
I figured that one out Ron eventually! 73s
I use a Heil icm for my 7300 and get compliments on ssb and fm, just buy a cheap momentry footswitch and cheap mic stand and your good to go
Thanks Paddy. 73
icom radios use condenser or electret elements in there mikes these are powered by the radio through the mike socket so be very careful if you wire the mike yourself clint try the mike from your 756 i did and it works well my compression is at 3 and mike gain 40% good comments from other stations "ron"
Thanks again Ron for the tip on using the mic from my 756. 73s, Clint
Waters and Stanton do the Adonis microphones which have a connection lead matched to the transmitter. See the video where he uses one on the IC 7300. th-cam.com/video/2MBzFvK4gLw/w-d-xo.html
Great review John, thanks very much for the link. 73s, Clint
Hi, 73 de IZ8KVW.
Hi there! 73s,