Re: Elecraft Digest, Vol 22, Issue 2 Message 3 TVI

[alan alan]

Hi David,

My suggestion is a coaxial trap or possibly a series LC to deck (use
a trimmer C).  The insertion loss will be minimal.  A single trap had
little effect on the feed Z as shown on my Tx but ideally a second
one about lambda/4 at 145MHz further down the feeder will offset the
effect at 145.  I'll be interested to see how it works on the
harmonic.

Regards  73   Alan G0HIQ

> Message: 3
> Date: Wed, 1 Feb 2006 12:07:19 +0000
> From: David Pratt <[hidden email]>
> I am having a problem with 5th harmonic radiation from my
> XV144 transverter.  I have found that I am causing TVI to
> the UK analogue Channel 51 (711.25MHz) and digital Channel
> 52 (719.25MHz).  Other TV channels are free from interference.
> 73 de David G4DMP



               
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[David Pratt]

Thank you, Alan, that is very helpful and will try that.  I have had a
suggestion that the problem could be due to high harmonic content from
the 28MHz output from the K2, so I am continuing with various test to
establish the cause.

73 de David G4DMP

>My suggestion is a coaxial trap or possibly a series LC to deck (use
>a trimmer C).  The insertion loss will be minimal.  A single trap had
>little effect on the feed Z as shown on my Tx but ideally a second
>one about lambda/4 at 145MHz further down the feeder will offset the
>effect at 145.  I'll be interested to see how it works on the
>harmonic.

>> I am having a problem with 5th harmonic radiation from my
>> XV144 transverter.  I have found that I am causing TVI to
>> the UK analogue Channel 51 (711.25MHz) and digital Channel
>> 52 (719.25MHz).  Other TV channels are free from interference.


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