ssage-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bob McGraw K4TAX
Sent: Friday, June 23, 2017 7:47 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] ATU and Bandpass Filter
If one chooses to use band pass filters then one should anticipate using
an
If one chooses to use band pass filters then one should anticipate using
an external antenna tuner as well. This of course depends largely on
the antenna and the impedance of the antenna at a given frequency.If
one is using resonant antennas with a reasonably close 50 ohm impedance
then a
20 meters with no trace on interference.
73
Frank
W3LPL
- Original Message -
From: "Don Wilhelm"
To: elecraft@mailman.qth.net
Sent: Saturday, June 24, 2017 12:03:29 AM
Subject: Re: [Elecraft] ATU and Bandpass Filter
What Matt said is true. However, if your a
Lane,
Yes, you cannot do that.
We are only discussing the need for the filter to have a 50 ohm
non-reactive load.
So if you are using a bandpass filter designed for a 50 ohm load (most
are), then you need to use resonant antennas.
What I was saying is that slight variations from a 50 ohm load
I think I'm missing something here. I'm not sure I understand putting
the ATU after the filter since the ATU is internal. How does one put
it after the external BP filter?
On Fri, Jun 23, 2017 at 7:03 PM, Don Wilhelm wrote:
> What Matt said is true. However, if your antennas are close to resonan
What Matt said is true. However, if your antennas are close to
resonance, go ahead and use the ATU to "touch up" the tuning.
If you are trying to use a multiband antenna such as a G5RV and such,
you might as well forget the advantage of the bandpass filter.
Our local club discovered that mul
The problem is that the filter is designed to work with a 50 ohm characteristic
impedance (ie. with a 1:1 VSWR). This means you need to put ATU *after* the
filter, not before, otherwise the filter will not work properly.
73 de Matt VK2RQ
> On 23 Jun 2017, at 1:13 pm, Lane
> wrote:
>
> A ques
A question about the K2. Taking it to the club for FD and I have a
bandpass filter (CF-20) which says "Never use radio's internal tuner
with filter."
I have the internal ATU installed. Is there a way to bypass that? Or
should I just use the "main antenna" jack (manual says never use if
ATU install
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