Stretch the bandwidth even further with balance feeder and an external tuner there's very little loss with swr in excess of 10.1

Remember what Walt Maxwell (W2DU) said in his article, "Reflections": "Too low an SWR can kill you." (Referring to the ham who spends so much time on his tower obsessing over adjusting his antenna for 1:1 SWR that he falls off.)

@watersstanton

2 жыл бұрын

Nice one William. 73 Peter

@Pioneer936

2 жыл бұрын

Great article and great book ,every amateur should read it

Another great commonsense presentation. Thank you so much, Mr Stanton

@watersstanton

2 жыл бұрын

You are very welcome

I've been watching your videos since the start of the first lockdown and they remain essential viewing. Lockdown would have been intolerable without ham radio, but as it turned out, I had quite a nice time. 😁👍

@watersstanton

2 жыл бұрын

You and quite a few others I guess. BUT not those who suffered with Covid. 73 Oeter

Excellent presentation, thank you

you will get an Oscar for this Peter.

@watersstanton

2 жыл бұрын

……..but maybe not! Thanks for watching. 73 Peter.

Superb! Thank-you.

:) ... Thanks for making me feel better about my high 2.0 - 3.0 SWR on my 80/10 end fed antenna. I usually forget about all that stuff when I am making a QSO - and just enjoy the hobby.

@watersstanton

2 жыл бұрын

Good stuff!. 73 Peter

Great video Peter. Just returning to the hobby and this sort of advice is very helpful

@watersstanton

2 жыл бұрын

Glad it was helpful!. Welcome back. 73 Peter.

The problem these days is that everyone does everything in ham radio to the Nth degree. I hear all sorts of concerns about losses through connectors on HF. Two connectors are not going to make any difference. There is a video on youtube of a US amateur measuring the loss of 40 PL259s and inline couplers and it was only about 1.5db. I used to have a neighbour who was an amateur and a BBC engineer. His home made 400w linear amp had TV coax plugs on it and he ran his LF antenna on TV coax. Its a case of what you have and what you can make work for you really.

@watersstanton

2 жыл бұрын

Yes 100% Gordon, 73 Peter

Great video (AGAIN). Thanks (AGAIN).

@watersstanton

2 жыл бұрын

Thanks again!

Excellent Peter, sage and sensible advice as the books don’t tell you that you have that degree of flexibility! 73

@watersstanton

2 жыл бұрын

Thanks Neil. 73 Peter

@neilmasters9914

2 жыл бұрын

@@watersstanton Keep up the good work, maybe a video on earthing a base station would be helpful to newcomers to the hobby as that is also fraught with confusing and contradictory advice. Neil

@Pioneer936

2 жыл бұрын

Neil ,reflections by Walt Maxwell goes into great detail about this subject

Cheers from the U.S.

@watersstanton

2 жыл бұрын

Hi Joe. Nice to hear from you. 73 Peter

Well said! Hams tend to worry too much about SWR. Although I can appreciate the in-built ATUs in modern rigs, I still like to use my 40-year-old tube final transceivers which can also handle a 3:1 SWR with ease. If you cut back the power to QRP levels with those, you can handle even higher SWR levels. I once made a contact on 160M using a 15M dipole with my 40-year-old FT-901DM just ticking above the normal idle current on tubes. -- John, N0BUP in Colorado

@watersstanton

2 жыл бұрын

Hi John. Thanks for the contribution. 73 Peter.

Hello Peter , Thank U for such Powerful/Deep topic , I wish you reveal more about the difference of the Antenna ERP as well as Received Noise , That's if we add some (Band Width Stretching Accessory) such as MFJ-908 & MFJ-909 , beside the difference Icom Mobile Antennas AH-760 and AH-740 ...

@watersstanton

2 жыл бұрын

Thanks for sharing. 73 Peter

Not so with my old Kenwood TS820, I swear it could tune a piece of wet string.

It can even be end fed.

Brill

@watersstanton

2 жыл бұрын

Thanks. 73 Peter

Thanks from Rochester…NY that is…for your incite full presentations. Facebook antenna groups are filled with: “Why can’t I get my SWR below1.5?” I’ll shall point them towards this video. When I forget to push the tune button on my LDG tuner, the FT-891 still sends out a signal with a 3.5 SWR on FT8…and I still make contacts. So your advice is sound. SWR 1.7? So what! I guess it matters to the QRPers running less than 5 watts. But I only run a max of 35 watts on FT8/FT4 and see no difference in contacts moving to 50 watts. …KA2VCW

@watersstanton

2 жыл бұрын

Hi Ricn. Many thabks for your input. 73 Peter

@Pioneer936

2 жыл бұрын

Point them to the book reflections by Walt Maxwell it explains in great detail how the tuner is tuning the system to resonance for maximum power transfer ,even with swr of over 10.1 with the correct feedline very little power is lost

Let‘s look at the numbers: How much loss a.k.a. reflected power (RP) does a certain SWR give you? 1.5 SWR: 4%; 2.0 SWR: 11%; 3.0 SWR: 25% (means 6 dB loss, that is one S-unit…not one dB… 🤦🏼‍♂️I am wrong - read the thread below). Don‘t worry too much about these losses, as long as you operate moderate power (up to 100W). Remember, you will still radiate 75W of the 100W at 3.0 SWR, if your TRX doesn‘t throttle down. Be careful, if you do modes with 100% duty cycle, especially digital modes. But on SSB an SWR of up to 3 should be no problem.

@watersstanton

2 жыл бұрын

Your dB relarionship is wrong. Check it out.

@pasixty6510

2 жыл бұрын

@@watersstanton yes, you're absolutely right. 6 dB would mean 75% loss, so that only a quarter of the power would be emitted. If you don't mind, I leave my original comment, but edit it, to give readers the chance to comprehend and learn out of my embarrassing mistake. 73 from Germany

@Pioneer936

2 жыл бұрын

@@pasixty6510 your forgetting to include reflection gain in your calculations

@Pioneer936

2 жыл бұрын

@@watersstanton if balance feeder was used because of reflection gain there is very little lost

@pasixty6510

2 жыл бұрын

@@Pioneer936 right, but even if you don’t take that into account, the loss at SWR 3 is only 1.25 dB. 10*log(100/75)=1.249

advanced and above average intermediate level and university genius level, but has nothing to do what so ever with normal human beings or beginners, learners or people looking for ideas or advice

@watersstanton

2 жыл бұрын

Not sure we are on the same planet!

honestly I expected the video to explain actual techniques of making the antenna bandwidth wider, rather than 13 minutes of trying to convince us that it's ok to use higher swr. quite disappointed.

@watersstanton

8 ай бұрын

You cannot increase the bandwidth of an antenna without changing the mechanics in a significant way. For example a dipole would require a very thick element or multiple wire sections. Neither options are very practical in a small garden.

@EvgeniX.

8 ай бұрын

@@watersstanton thanks for the reply! Actually using fat elements sounds like a reasonable modification, especially at the higher bands where antenna size is more manageable.