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 SWR - how high is too high?

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NUBSTER
The Doctor
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The Doctor
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The Doctor


Posts : 61
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Join date : 2020-05-03
QTH or Location : Hertfordshire
Equipment Used : Uniden

SWR - how high is too high? Empty
PostSubject: SWR - how high is too high?   SWR - how high is too high? Icon_minitimeWed Aug 12, 2020 10:05 pm

Hi All,

I’m looking for advice as to whether I’m being too precious with SWR and in doing so, costing myself Watts.

Across most of the frequencies I use, I have an SWR of 1:1.
Max 1.4 : 1 at the high end of my rig’s range.
I have a Zetagi TM999 in-line which is a Wattmeter, SWR meter and matcher all-in-one.
Now, when running low power, SWR of 1.4:1 would not bother me enough to use the matcher.
However, when running a linear, I use the matcher to pull it down closer to 1:1.
However, upon doing so the Wattmeter falls from 80W to 60W, (as example).
Probability not the most accurate meter, however, am I concerning myself too much with the SWR v’s the linear’s transistors?
Would you guys just roll with the 1.4:1?
Is it even worth using the matcher for 1.4:1 ?

Any thoughts or advice greatly appreciated as always,

Smile
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The Doctor
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Posts : 61
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Join date : 2020-05-03
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PostSubject: Re: SWR - how high is too high?   SWR - how high is too high? Icon_minitimeWed Aug 12, 2020 11:53 pm

Thanks NUBSTER,
Yes, it just “creates” a match. (Absorbs the reflected power, by minor tweaks to impedance I assume........)
Paracetamol for radios Very Happy

Thanks for your reply.
Rory

Tristar likes this post

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Tristar
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Call Sign : 26-CT-3771
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Equipment Used : CRT Millennium 3v hand sets, President Barry2
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PostSubject: Re: SWR - how high is too high?   SWR - how high is too high? Icon_minitimeSun Aug 16, 2020 6:26 pm

Hi 👋🏻 

I didn’t know that!

Always thought it magically fixed it!

Duh!🙊

glenn dog likes this post

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Bovril
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Join date : 2020-06-26
QTH or Location : Ruislip, London.
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PostSubject: Re: SWR - how high is too high?   SWR - how high is too high? Icon_minitimeTue Nov 10, 2020 12:41 am

Well, to some, all radio is magic...Tristar...he-he.
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43CT016
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PostSubject: Re: SWR - how high is too high?   SWR - how high is too high? Icon_minitimeTue Nov 10, 2020 9:02 am

The Doctor wrote:
Thanks NUBSTER,
Yes, it just “creates” a match. (Absorbs the reflected power, by minor tweaks to impedance I assume........)
Paracetamol for radios Very Happy

Thanks for your reply.
Rory

All the tuner (Really poor name for them, BTW!) is doing is presenting a near 50 ohm load to radio, nothing more.  The SWR between tuner and antenna is still whatever it was before.

People will argue all day about the efficiency of resonant vs non-resonant antennas, so I won't even go there....  Very Happy

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Alan Pilot
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Alan Pilot


Call Sign : 163-CT-220...
Posts : 2657
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Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7610,,Anytone AT-D878UV PLUS",,LINCOLN II+.
Age : 16

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PostSubject: Re: SWR - how high is too high?   SWR - how high is too high? Icon_minitimeTue Nov 10, 2020 9:59 am

The best tuner in the world can't adjust the physical length of the antenna.
I just fools the transceiver into seeing a 50 Ohm load.
I think i am correct but i could be wrong as i am falling to bit's
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PostSubject: Re: SWR - how high is too high?   SWR - how high is too high? Icon_minitime

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