This is a fantastic series of lessons on the IC 7300 - Much appreciated and welcome .. I'm new to the 7300 and you have made owning and NOW using this great radio ..
@MrMHancock
5 жыл бұрын
Excellent lesson learned, and a very clean setup for your antenna. Thanks much for sharing the followup.
@jimyohe100
5 жыл бұрын
Another good lesson. Thanks for the ideas. I have RFI in my shack and now have a couple more ideas to follow to try to minimize or eliminate it.
@user-su5sq5ib3i
3 жыл бұрын
there is a good article on coax wound chokes, I think the amount of wraps are frequency dependent but thats great that you were able to suppress the rf. It would have been interesting to see it it was either the choke or the ground? 73
@mark6831
5 жыл бұрын
I enjoy all your video's description keep up the good work from K2CSX mark 73s
@mingram008
5 жыл бұрын
Love the work! Keep it up.
@daveduffy2292
4 жыл бұрын
Hi Tom . Thanks for all you help with the IC 7300. Awesome job. One question about the 9:1 balun unun. What length is you earth wire? I’m planning the same set up as you hav.
@HamRadioA2Z
4 жыл бұрын
Hi Dave. I have moved from that location. I never did accurately measure the counterpoise wire, but it was about 20-30 feet. I also experimented with adding to the 53 ft. Length of the original antenna. However, you have to be careful about this. It is important that the antenna length is NOT resonant on any bands you want to work on. Any frequency where the antenna is resonant will present a very high impedance at the feed point and the 9:1 transform won’t bring it down low enough to be reasonable to tune. If you Google “non resonant end fed antenna” you’ll find some web sites that give a number of lengths to use depending on which bands you want to work. Good luck with it and let me know how it works for you. 73, Tom
@wafbootq
3 жыл бұрын
Why do you run your mic gain so high? I've always thought it should never be over 50% on the ALC meter.
@jwnagy
8 ай бұрын
Im enjoying the series. I just experienced an issue and I wanted your input. I used the internal tuner a few days ago and when it stopped, the receive signal was down (reflected also on the waterfall) and was only receiving very strong signals. I tried tuning again and still the same. Any ideas? I'm ready to try a total reset as a last resort. The radio was purchased new from HRO at the end of December, only 60 days in use. Jeff - W3AAB
@HamRadioA2Z
8 ай бұрын
Hi Jeff. I have several questions. This could quickly get too long for KZitem comments very quickly. Please reach out through the Contact Me on the channel website- a-2-z.tech
@jeanbaptistebrevelle1239
3 жыл бұрын
I thought with “shielded” coax that near by interference would be eliminated? If this is true how does the coiled coax affect inductance? Or would the extra wraps on the torrid would have been what affected your out come?
@HamRadioA2Z
3 жыл бұрын
The shield helps with many things, but it is not a perfect solution. If the antenna isn’t a perfect 50 ohm match for your coax (and a random length end fed never is) you can get common mode voltages between the shield and center conductor that will cause the shield to radiate like it is part of the antenna. This can radiate all the way into the shack and can cause your equipment chassis to be “hot” with RF. The coiled up section of coax becomes what is called a Choke BALUN (Balanced to Unbalanced). The name comes from it choking off the RF and preventing it from coming down the shield into the ham shack. Here is one article on the subject: www.hamuniverse.com/balun.html. You will find a lot of opinions about how much coax, how many turns and what diameter is best. The best answer can be determined by mathematical analysis. However, there is a lot more opinion than analysis out there. In my case, the amount of coax in my choke was very scientifically determined based on how much extra coax I had available. 😉
@oooomoment5739
4 жыл бұрын
Still slamming the ALC to full scale??? This doesn't look right based on your previous instructions.
@donsilva4441
5 жыл бұрын
Compression on 8 and it's hardly showing ? Mine is on 3 and is almost too much. Any higher with the hand mic and it's overblown. Now, I have a desk mic that I tuen it up to 6 on.... sounds good though.
@HamRadioA2Z
5 жыл бұрын
As I was recording this, I was talking into both my video mic and the rig mic at the same time. I've got my video mic gain up fairly high and I'm speaking pretty softly. I was recording these fairly late in the evening and trying not to disturb others in the house. I was probably also paying less attention to the rig mic and not holding it close enough. I think if I was talking in a normal voice and just paying attention to the radio my settings would have ended up different. Thanks for watching and thanks for your comments.
@donsilva4441
5 жыл бұрын
@@HamRadioA2Z ah, ok. I recently bought this radio, and I noticed distortion when the compression is too high coming through when you have the monitor on. It sounds like RF on your signal, but it's not. The 7300 needs very different settings for different mics that you might use. I have 3 mics I use with it. I have the stock hand mic, a Heil Pro 6 elite with the regular dynamic hc-6 element, and a Heil HM-12 for a desk mic. In that order, you need lower to higher settings all around to get about the same results. It helps to have a friend on air to help dial them in. For the stock mic, I use treble +3, bass 0, compression 3, and mic gain 45-50. This suits a deeper voice. The headset... treble +3, bass +1, compression 5 or 6, and mic Gain 55-60. For the HM-12 Treble +3, bass -1 or 0, compression 6-7, mic gain 65. Using a condenser like the hand mic is a bit hot. Newer Icom's are like that, so it's no surprise the settings are much lower than a dynamic.
@donsilva4441
5 жыл бұрын
Some end fed manufacturers recommend a line isolator to keep RF out.
@HamRadioA2Z
5 жыл бұрын
Thanks Don. I agree that's one way to do it. See my reply to bigbangnone below. In my case, I have a separate counterpoise and I wanted to stop my coax from acting as a 2nd counterpoise. That's why I put the choke right below the unun.
@donsilva4441
5 жыл бұрын
@@HamRadioA2Z Thanks. Antenna theory heavy here. I haven't done much with end feds, so I'm learning here. That's good because I want to employ one for portable ops.
@HamRadioA2Z
5 жыл бұрын
Trust me, I'm just learning too. I've only started playing with end feds over the last 4-5 months. I've been doing as much reading as I can. Over the years, I've found that antenna discussions are lot like politics, religion or the best pickup truck to buy. People have very strong opinions about their favorite antenna and how to deploy it. And, on top of that, if you ask 10 different hams you'll get 20 different opinions.😉
@donsilva4441
5 жыл бұрын
@@HamRadioA2Z Huh. Makes me think that there are a lot of wrong answers out there then. The good news is that we know certain basics that get the job done and accomplish effects that we are looking for. If we at least stick with these, we are a good way along to where we need to be.
@denniswage9748
3 жыл бұрын
You called that an end fed. A true end fed has no counterpoise wire. It’s work entirely against ground. Isn’t this really an off center fed dipole? End feds also need a 50:1.
@HamRadioA2Z
3 жыл бұрын
Hi Dennis. It is definitely an end fed antenna. I could have just connected the ground terminal on the unun to a good ground instead of a counterpoise. It's just that in setup in this video and the other temporary setup I had, I didn't have a good RF ground available. I will agree that the line between an OCF and end fed does get a little muddy with the counterpoise. The 50:1 unun that you're thinking of is for a half-wave end fed. That is a resonant antenna for 1 specific band. The end of a half wave wire is very high impedance. So if you're going to feed there with a 50 ohm line, you need a very large transform ratio, thus the reason for the 50:1. My antenna is a "random" length specifically chosen to not be resonant on any of the bands I want to use. So it needs a tuner for most bands. Most of the articles on these call them random length. Oddball length is probably a better description, since it isn't really random at all. Thanks for watching! 73, Tom
@782matt2
5 жыл бұрын
Hi I liked the Video,,,,,,, But your comp is to High you only need about 5/4 that's 10Db. on my radio my power 100% the mic gain is 80% and the comp is set at 5..........73s Matt
@HamRadioA2Z
5 жыл бұрын
Thanks Matt - Yes, I usually have my COMP set to about 4. In one of the previous comments, I mentioned that I was filming this late in the evening, talking softly and also talking away from the rig mic as I was using both the rig mic and my video mic. So I ended up setting the Comp up a lot higher than normal to see any effect. Unfortunately, I didn’t think to comment about that in the video.
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