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 SWR - how high is too high?

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The Doctor
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The Doctor

Call Sign : 26-CT-3515
Posts : 61
Times Thanked : 3
Join date : 2020-05-03
QTH or Location : Epping, Essex
Equipment Used : President McKinley on Antron 99, Uniden UBC785XLT on ScanKing Royal Discone, Motorola XTN446

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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NUBSTER
10 + Year member
10 +  Year  member
NUBSTER

Call Sign : 26 CT050 26 FB080 26 WT105 26 TE171
Posts : 717
Times Thanked : 44
Join date : 2019-06-27
QTH or Location : NORTH LONDON
Equipment Used : ORIGINAL President Lincoln, Midland 8001XT, President Teddy , Silver Eagle microphones , Gainmaster antenna, use a AMP ofcourse I do sometimes
Age : 62

SWR - how high is too high? Empty
PostSubject: Re: SWR - how high is too high?   SWR - how high is too high? Icon_minitimeWed Aug 12, 2020 10:17 pm

As long as it doesn't go over 1.5 when using the amp your ok ,in fact on normal radio power  even up to SWR of 2.0 is ok really just not as effective if it was lower, basically the lower the SWR the better,as for a matcher its doesn't actually lower your SWR it just lies to the radio in to thinking its lower .


Last edited by NUBSTER on Fri Aug 14, 2020 7:15 am; edited 1 time in total

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The Doctor
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The Doctor

Call Sign : 26-CT-3515
Posts : 61
Times Thanked : 3
Join date : 2020-05-03
QTH or Location : Epping, Essex
Equipment Used : President McKinley on Antron 99, Uniden UBC785XLT on ScanKing Royal Discone, Motorola XTN446

SWR - how high is too high? Empty
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

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Tristar
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Tristar

Call Sign : 26-CT-3771
Posts : 62
Times Thanked : 2
Join date : 2020-08-10
QTH or Location : Weston-super-Mare
Equipment Used : CRT Millennium 3v hand sets Pama GT-19
Age : 56

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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!🙊

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Bovril
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Call Sign : 26-CT-3694
Posts : 16
Times Thanked : 2
Join date : 2020-06-26
QTH or Location : Ruislip, London.
Equipment Used : Yaesu FT2000D

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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
Senior contributor
Senior contributor
43CT016

Call Sign : 43-CT-016
Posts : 122
Times Thanked : 7
Join date : 2019-11-17
QTH or Location : Perth
Equipment Used : iCom IC-7610/IC-9700

SWR - how high is too high? Empty
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...MW7TTA
Posts : 469
Times Thanked : 15
Join date : 2019-11-19
QTH or Location : Holyhead
Equipment Used : Yaesu FT-991A.

SWR - how high is too high? Empty
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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