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data-reddit-rtjson="{"entityMap":{"0":{"type":"LINK","mutability":"MUTABLE","data":{"url":"http://ehpes.com/n6mw/WireYagi2.pdf"}}},"blocks":[{"key":"bs0s1","text":"So
I'm trying to throw together a 3el 6m yagi for the VHF contest
this weekend. I built one based on a design for a wire + PVC beam
I found on da Google (http://ehpes.com/n6mw/WireYagi2.pdf). Mine
has a bit less duck tape.
;-)","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[{"offset":156,"length":35,"key":0}],"data":{}},{"key":"pqot","text":"I
tested only the driven element with my nanoVNA, spot on 1.1 at my
target of 50.2 (FT8). I added the reflector - still 1.1. (All
measurements taken at about 10ft. elevation). I added the director
- the lowest SWR is now 2.5:1 at the same freq. (the SWR low point
did not change).
","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"1m3h5","text":"The
measured impedance dropped from 50.2 to around 35 after adding the
director. I took the wire off the director element support (aka
PVC pipe) and the SWR went back to
1.1:1.","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"ded03","text":"What
variables in the director (length, spacing from DE, etc.) would
cause
this?","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}}]}">
<div class="" data-block="true" data-editor="540011"
data-offset-key="540011_initial-0-0">
<div data-offset-key="540011_initial-0-0"
class="public-DraftStyleDefault-block
public-DraftStyleDefault-ltr"><span
data-offset-key="540011_initial-0-0"><span data-text="true">So
I'm trying to throw together a 3el 6m yagi for the VHF
contest this weekend. I built one based on a design for a
wire + PVC beam I found on da Google (</span></span><span><a
href="http://ehpes.com/n6mw/WireYagi2.pdf"
class="_1FRfMxEAy__7c8vezYv9qP"><span
data-offset-key="540011_initial-1-0"><span
data-text="true">http://ehpes.com/n6mw/WireYagi2.pdf</span></span></a></span><span
data-offset-key="540011_initial-2-0"><span data-text="true">).
Mine has a bit less duck tape. ;-)<br>
<br>
</span></span></div>
</div>
<div class="" data-block="true" data-editor="540011"
data-offset-key="2camq-0-0">
<div data-offset-key="2camq-0-0"
class="public-DraftStyleDefault-block
public-DraftStyleDefault-ltr"><span
data-offset-key="2camq-0-0"><span data-text="true">I tested
only the driven element with my nanoVNA, spot on 1.1 at my
target of 50.2 (FT8). I added the reflector - still 1.1.
(All measurements taken at about 10ft. elevation). I added
the director - the lowest SWR is now 2.5:1 at the same
freq. (the SWR low point did not change).<br>
<br>
</span></span></div>
</div>
<div class="" data-block="true" data-editor="540011"
data-offset-key="9ulb8-0-0">
<div data-offset-key="9ulb8-0-0"
class="public-DraftStyleDefault-block
public-DraftStyleDefault-ltr"><span
data-offset-key="9ulb8-0-0"><span data-text="true">The
measured impedance dropped from 50.2 to around 30 after
adding the director. I took the wire off the director
element support (aka PVC pipe) and the SWR went back to
1.1:1. I did check that the elements were parallel (as
best as can be accomplished with PVC tubing and bits of
cutting board).<br>
<br>
</span></span></div>
</div>
<div class="" data-block="true" data-editor="540011"
data-offset-key="4ui97-0-0">
<div data-offset-key="4ui97-0-0"
class="public-DraftStyleDefault-block
public-DraftStyleDefault-ltr"><span
data-offset-key="4ui97-0-0"><span data-text="true">What
variables in the director (length, spacing from DE, etc.)
would cause this?<br>
<br>
73<br>
<br>
Tim - KC1RET<br>
</span></span></div>
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