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Content preview: On Monday, December 03, 2018 10:03:00 PM you wrote: > Hi Paul, > > I think the scope match may be an old method but is advanced because it > shows not only the magnitude of voltage and current and the [...] Content analysis details: (-0.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [212.97.34.22 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (smtp01[at]email.it) 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (smtp01[at]email.it) 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 0cdfd8d5ce44f1724c623c4ac9f44df6 Subject: Re: LF: Re: More on unstable antenna R Content-Type: multipart/alternative; boundary="nextPart5047406.Zyiq0SKo0M" Content-Transfer-Encoding: 7Bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_50_60, HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false This is a multi-part message in MIME format. --nextPart5047406.Zyiq0SKo0M Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Monday, December 03, 2018 10:03:00 PM you wrote: > Hi Paul, > > I think the scope match may be an old method but is advanced because it > shows not only the magnitude of voltage and current and the phase > between them, it also shows the waveforms at the power level of > operation! A VNA, if i'm informed correctly injects a small test signal, > so it is not a measurement at the peak power! > If your antenna R just changes from 58 Ohm to 46 Ohm, then just forget > it! I bet the changes can be much higher on average radio amater setups. > I agree Stefan! And in my opinion if the transmission line is shorter than 1/10 of the wavelength ALL the impedance adjustments can be performed at the Transmitter side of the line. So the impedance transformer at the antenna side is an unnecessary loss. Adjust X at the antenna side and adjust R at the transmitter side ;-) 73 de Claudio IK2PII -- -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui http://posta.email.it/caselle-di-posta-z-email-it.php?utm_campaign=email_Zimbra_102014=main_footer/f Sponsor: Idee regalo classiche o alternative? 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On Monday, December 03, 2018 10:03:00 PM you wrote:

> Hi Paul,

>

> I think the scope match may be an old method but is advanced because it

> shows not only the magnitude of voltage and current and the phase

> between them, it also shows the waveforms at the power level of

> operation! A VNA, if i'm informed correctly injects a small test signal,

> so it is not a measurement at the peak power!

> If your antenna R just changes from 58 Ohm to 46 Ohm, then just forget

> it! I bet the changes can be much higher on average radio amater setups.

>

 

I agree Stefan!

 

And in my opinion if the transmission line is shorter than 1/10 of the wavelength ALL the impedance adjustments can be performed at the Transmitter side of the line.

 

So the impedance transformer at the antenna side is an unnecessary loss.

 

Adjust X at the antenna side and adjust R at the transmitter side ;-)

 

73 de Claudio IK2PII

 

--

 




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