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If you’d like to support the channel, I’ve set up a Patreon page for you to help out with much needed and thankful donations! www.patreon.co...
Please Subscribe, I don’t monetize this channel. I do it to get back and help others get into ham radio as well as be as successful in it as possible.
Ham Radio Live Show 221 talks about the importance of using remote tuners when using a multi band non-resonant antenna instead of the internal tuner in your shack. The reason is because your antenna impedance is so far away from what your transmitter or amplifier needs to safely operate, that much, if not most of your power from your transmitter is lost as heat through your coax.
On top of that, if you’re using coax with a higher loss factor, The ground gets heated up even more and even less of your precious power from your radio or amplifier is sent out on your antenna.
This is why a remote tuner is ESSENTIAL at the feed point of the antenna. Instead of sending a high VSWR to your shack (even with the best of coax available today) you’re hitting the ground up more than you’re sending out a signal over your antenna.
At 6:43 of this video, get today’s HF Forecast.
At 11:47 of this video, find out the reason why a remote tuner can be so important when using a non resonant antenna.
MFJ Remote Tuners noted in this video:
MFJ 926b, 200W: mfjenterprises...
MFJ 993BRT 300W mfjenterprises...
MFJ 994BRT, 600W: mfjenterprises...
MFJ 998RT 1500W mfjenterprises...
For the antenna loss information, click here: antennatestlab...
For the Coax Loss Calculator shown on the show, click here: www.qsl.net/co...
This was hopefully a helpful show for people to
understand the importance of a remote tuner for a multiband non resonant antenna and of using quality feedline, no matter what antenna you’re using. You’ll get more power out of your transmitter.
Thanks a lot for watching the show. I sincerely appreciate it.
Gunter, DK5ONV
Tom A92GW
Rod K7LAP
Larry K7HN
I welcome your questions as well as your comments about the show. It isn’t for everyone. I realize that. The main audience is for people who aren’t in amateur radio and inspire them. to get their ham radio license. Please reach me at the shows email address which is: CQHamRadioLive@gmail.com
You can study for ANY of the UK Ham Radio License Exams at this link. But STUDY With a ham club or online company that specializes in helping UK amateurs pass their exams. I’m not a substitute for study! I do try to put things in layman‘s terms so you can understand them better to help pass your test.
Big thanks to Paul Herrman, N0NBH, for his great propagation webpage showing an incredible amount of information about the sun and how it effects ham radio. I get some of my information from his webpage. You can find it here: www.solarham.net
radiotutor.uk/...
US Ham Radio Test help can be found at this link: aa9pw.com/amate...
The goal of this channel is to help people get on the air! If you’d like to know more about ham radio or find out where your nearest Radio club is to help get you on the air, contact the American Radio Relay League at www.ARRL.org.
UK viewers, if you’d like to get into amateur radio and receive your license, contact the Radio Society of Great Britain. You can find them at www.rsgb.org.
Canadian viewers, find the Radio Amateurs of Canada at www.RAC.ca
Australian viewers: if you’d like to know how to get your license Contact www.wia.org
MFJ has many accessories that can help make sure ham shack much more effective! From antenna analyzers to amplifiers and antennas to noise canceling devices MFJ has you covered from A to Z! Find them at www.MFJenterprises.com

Опубликовано:

24 авг 2024

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Комментарии : 16

@Proc3000 7 месяцев назад

Looking at the zero five flag pole and seeing many reasons now to use a remote tuner.

@bolovanro 3 года назад

What about quality of MJF producs? I have two: MFJ-941E and MFJ 993BRT. Both are with very low quality builds. In fact, in MJF 993BRT...the soldering si done with iron for pipes. Also coils on toroids was loose...also the relays are making some funny noise. And yes, the tuner was brand new...and no, I don't push more than 100W (in fact, I play a lot with QRP < 5W) and I don't play with digital modes. More, I believe that I got some kind of refurbish MFJ (and yes, it was brand new, sealed box). If you want pictures...just announce me... Sometimes the will tune...(most often if I am in range of 10.120 - 10.130MHz)...will tune with swr 4...but if I am on 10.119...it will tune with swr of 1.4). Also, the bias-tee was blown (the coils) in 160m band... It's true, the tuner is able to tune even a fork or a spoon...but the quality of build is so low...almost unreal...

@HamRadioLiveShow 3 года назад

Sorry you had problems with these products. I have probably over a dozen MFJ products here. Everyone of them work perfectly. Also, they have I think the most extensive warranty in all of amateur radio. Hope you have a great day and thanks for watching the show! Larry de K7HN

@bolovanro 3 года назад

@@HamRadioLiveShow Unfortunately, also on eham I found that I am not the only one with this problems. Also a lot of people are complaining about the quality (some says that they also needed to solder/resolder some joints...) and for this reason evaluation is poor. I wanted to buy MFJ 998BRT (I want to buy a linear amplifier)...but for this reason (reading evaluation on eham, reading on forum etc)...I don't have courage to give almost 900 euro (1100 USD) on a product with this quality.

@HamRadioLiveShow 3 года назад

I can only share my experience my friend. I’ve had nothing but great luck with MFJ gear. Every single piece I have which is like I said well over a dozen MFJ products has worked perfectly. Plus I always feel good about their warranty. I think it’s the best in the business. All the best to you and I hope you have a very good day. Larry

@c.m.dawson2478 2 года назад

Have used remote tuners of all makes and power for years. The elephant in the room is always excessive circulating current when the autotuners try to match complex impedance outside their design parameters. Common culprits seem to be (in the case of verticals) poor radial fields and excessive power applied. Many other factors can and will contribute as well. The only observation I can make given the above is "you get what you pay for..." YMMV es 73

@HamRadioLiveShow 2 года назад

This is a great remote tuner. I very much like it and it’s worked me the world. If you’re using something like a flag pole antenna which is something that’s really not resonant, what if you live in an HOA, where they don’t allow you to have “antennas,” this remote tuner will make the antenna work brilliantly. Not everybody can put up an antenna on their property. But usually flagpoles are allowed. You need a remote tuner like this to make it work.

@w4orh-ron 3 года назад

Larry, Thanks for your response. I was actually referring to the return loss. The video shows the infinity value, but below that on the analyzer is the Return Loss showing 0.16 or 0.17 db. I'm only suggesting that the return loss is not 16 or 17 db but instead 0.16 db or 0.17 db. I have the same setup a my Florida winter home, with CCRs, so I too use a 22 foot flagpole antenna, with the MFJ 993 BRT. Works really well with my ICOM 7610. I used 3/4 inch braid up the inside of the pole to provide a bit of broad-banding (but probably not required due to the antenna mounted tuner). Fed with 25 feet of LMR-400. The real key was providing an adequate ground radial field in the sandy Florida soil. (Isn't sand just a silicon semiconductor? Ha! ) I currently have 16 radials but 32 would be better. While it's one thing to get the antenna to match, it's another to get it to be a great radiator. Also have a 6 foot ground rod driven in at the base. (Hey, everyone knows a good flag pole needs to be grounded. -- or at least that's what I'm telling the neighbors. Of course in central FL you have to be careful driving ground rods - you may open up a new sink hole!!! Ha!). The automatic tuner is mounted inside a plastic deck box that sets beside the antenna with a short , 10-inch copper wire connection to the antenna and buried coax. Anyhow, great project and it certainly works with regular contacts throughout North America, Europe, South and Central America.! Thanks, Ron

@HamRadioLiveShow 3 года назад

Thanks Rob, you are correct. Feedline is so important. I wish I could afford higher than an LMR 400 generic. I’d love to go up to an LMR 800. But I have a lot more to worry about than that right now my friend. Thank you again for riding in. It’s really nice to meet you. Larry

@MrZerohour1967 5 месяцев назад

The losses are not "huge" nor a "mess", those subjective terms that don't stack up against your own math. At a VSWR of 4:1@14MHz, 50 ft of RG8X delivers 78W to the antenna while LMR-400 delivers about 90W. That's about 0.5dB. Given that 1S point is about 6dB, we're talking 1/12th of an S point. This is why engineers do these calculations in dB and not watts.

@daveborchard2019 Год назад

The remote tuner is important to reduce massive power losses in the coaxial cable when transmitting, so that the maximum power reaches the antenna. But when looking at just receiving signals, does the remote antenna tuner make a difference with the received signals? Or, are the received signals the same if you compare using a remote tuner, the shack tuner, or no tuner at all?

@w4orh-ron 3 года назад

Gee, I read your antenna analyzer at 0.17 db at 2:1 in the first example Did I miss something? Why do we ignore the 0. On the reading?

@HamRadioLiveShow 3 года назад

There was not a “zero” there, it was the “infinity sign.” For me, that means it was above 50:1. All bands were the same way. When I “tune” from the antenna tuner at the base of the antenna, it comes in at 1.2:1 on 20, 1.5:1 on 40 and 2.5:1 on 80. It’s just too short for 80 at 24 feet. If I “tune” using my MFJ 998 desktop tuner, it gives me similar SWR readings but the power drops significantly to the flagpole due to the feedline loss from so much SWR coming from the antenna down the coax. After doing this show I did some additional testing using the desktop to tune it inside instead of outside. It could still make calls, but the S reading on the receiving station was significantly lower. About 2 to 3 S units lower. Ron I do have one extra section of the flagpole itself, I just chose not to use it because it aesthetically makes it look too tall for the house. If I used that extra length that I have, it would make 80 m better and get the signal out farther… But I just don’t think this is ideal at 80 m unless it’s about 40 feet high. Just my opinion. I think with the 998RT, it does amazing work considering my actual VSWR readings. An antenna that truly just looks like a flagpole is actually a very good antenna and has work me from Europe to Australia. As to the tuner photo: It was really hard to me Ron to get a good picture of the zoom analyzer because of the way the sun was out that day. Sorry it was hard to see. All the best to you and yours my friend, thank you for watching. Larry de K7HN

@rossbassette7518 3 года назад

Way too many RU-vid reviewers are showing antennas which use cheap 9:1 UNUN's with random wire , or are using portable, non-resonant vertical antennas made by Chameleon. These antennas are good used out in the field with a short piece of coax, especially if QRP. However, as you emphasized, if you are using a long run of coax, or or higher power, you will be losing a lot coming back into the shack

@HamRadioLiveShow 3 года назад

Do you know Ross, I just couldn’t find many RU-vid videos that showed remote tuners is out there. And why you need them. I’m grateful to have been able to make this one. I hope it helps people it for many years because they can be very important for non-resonant Antenna Thank you again Ross, Larry de K7HN