Talk to me about swr and matchers

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original45
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Talk to me about swr and matchers

Post by original45 » 10 Jun 2018, 14:21

Never owned a matcher or even used one.
I have seen the modern plug in jobs where you press button and it does it automatically but one their costly 2 I like manual stuff.

I would like to add a swr matcher to my radio set up and I'm considering
A used model ,I keep seeing model 175 matchers on fleebay with a swr and matcher meter, would this kind decent model to purchase firstly and are they the simplest to use and suitable .

Planning to use something on Linc 1 .

I'd appreciate you best advices please. Pros and cons.

Thank you

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ch25
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Re: Talk to me about swr and matchers

Post by ch25 » 10 Jun 2018, 14:27

Matcher placed next to radio protects your final(s) from destroying due to bad SWR. That's all.
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Tim
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Re: Talk to me about swr and matchers

Post by Tim » 10 Jun 2018, 15:30

If you have an SWR below 2:1 you don't need a matcher and as far as your application is concerned a matcher basically lowers the power output of the radio.

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Buick Mackane
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Re: Talk to me about swr and matchers

Post by Buick Mackane » 10 Jun 2018, 16:25

Tuning your antenna is far more effective than using an ATU (Matcher)

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Re: Talk to me about swr and matchers

Post by original45 » 10 Jun 2018, 16:53

I have tuned the antenna as well as its able. However on the edges of frequencies I can use they are just over 2 ,whilst this is still acceptable ,call me over protective I would rather lower the swr than risk damage or over working of any internals .

If anyone has recommendations for specific models also I'd be happy to consider them.

Also I note on some of the older 175/176 /178 models some still have the wire rod present, whilst some don't.

Is this important,are they specific lengths and gauge or can I make one simply to replace if I purchase one with missing wire

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Re: Talk to me about swr and matchers

Post by wa10 » 10 Jun 2018, 18:18

What matchers do and don't do is possibly the biggest can of worms in amateur radio,
on one side you have walt maxwell and others giving us the conjugate match theorem,

on the other you have guys like Owen duffy and others,
these guys have argued about it for years, articles refuting each theory have surfaced from time to time,

Then there was an English guy who said they were both incorrect, can't recall his name,

i used to try to follow the arguments back & forth, then it all got too much to be bothered with, even the smart folk can't agree,

There are matchers & matchers, some are lossy and some with little loss, units like mod 178 are low power cb matchers with plastic tuning capacitors, easy to burn up especially if the vswr is high before you put the matcher in line,
the wire antenna is for field strength, any bit of wire will do the job.

original45
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Re: Talk to me about swr and matchers

Post by original45 » 10 Jun 2018, 18:29

Thank you , yes I just noted they are in fact for low power radios.

Zetagi tm 999 seems to cover what I need power wise,swr ,power Meter and antenna matcher.
Anyone recommend these , not going to break the bank reviews seem ok too ? .

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ch25
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Re: Talk to me about swr and matchers

Post by ch25 » 10 Jun 2018, 19:02

100/200W with those tuning caps? b0llox.
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original45
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Re: Talk to me about swr and matchers

Post by original45 » 10 Jun 2018, 20:54

Take it their crap then .

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Ur5by9
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Re: Talk to me about swr and matchers

Post by Ur5by9 » 10 Jun 2018, 21:17

Tim wrote:
10 Jun 2018, 15:30
If you have an SWR below 2:1 you don't need a matcher and as far as your application is concerned a matcher basically lowers the power output of the radio.
Or listen to that load of coswollop :thumbdown:

An Antenna matcher is nothing more than a compromise to trick the radio into seeing a low standing wave ratio which will prolong the finals of the radio longer.

It does this by matching the impedance of the antenna to the feeder, compromise being the key word however if its the best you have to work with then it will allow you work with what you have. Handy in many applications for tuning using multi band use. Performance is another story.

I use an Automatic tunner on 100ft of wire to tune the HF band's.

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ch25
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Re: Talk to me about swr and matchers

Post by ch25 » 10 Jun 2018, 21:24

No compromises for me. All antennas are resonant where should be.
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Re: Talk to me about swr and matchers

Post by cb4ever104 » 11 Jun 2018, 09:05

If you're going to buy one , then my advice would be to buy a decent one . It'll last you a lifetime . I bought a Palstar one a few years back and it works great .

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Re: Talk to me about swr and matchers

Post by paulears » 11 Jun 2018, 09:26

If an antenna on a quite narrow band gives unacceptable performance at these edges, it's not a very useful antenna - the band is not wide, and if an ATU is needed to rectify a poor antenna, then I'd want to be using a different antenna. After all, the poor antenna is still poor, the ATU just convinced the transmitter to be comfy with it.

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Re: Talk to me about swr and matchers

Post by 108EH002 » 11 Jun 2018, 13:06

If it was me original45,I would keep the money that you are looking to spend/waste on a matcher,and buy a decent homebase antenna instead of buying equipment you won't use in the future,as a decent antenna doesnt need a matcher on 27 MHz.
Last edited by 108EH002 on 11 Jun 2018, 13:19, edited 1 time in total.
You can talk worldwide on CB not 10 - 15 miles,
some are too far up their own @rse to admit it = snobs.

27.781.25 Fm
27.555 Usb
27.385 Lsb
27.315 Fm
27.275 Usb
27.025 Am

108EH002
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Re: Talk to me about swr and matchers

Post by 108EH002 » 11 Jun 2018, 13:18

original45 wrote:
10 Jun 2018, 16:53
I have tuned the antenna as well as its able. However on the edges of frequencies I can use they are just over 2 ,whilst this is still acceptable ,call me over protective I would rather lower the swr than risk damage or over working of any internals .

If anyone has recommendations for specific models also I'd be happy to consider them.

Also I note on some of the older 175/176 /178 models some still have the wire rod present, whilst some don't.

Is this important,are they specific lengths and gauge or can I make one simply to replace if I purchase one with missing wire
As well as it is able = have you wrapped copper wire around the threaded end of the groundplane legs and tried altering the swr in this way ?
You can talk worldwide on CB not 10 - 15 miles,
some are too far up their own @rse to admit it = snobs.

27.781.25 Fm
27.555 Usb
27.385 Lsb
27.315 Fm
27.275 Usb
27.025 Am

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