This is interesting. Have you (or anyone else in the group) actually
used a preselector and/or highpass filter with a 7030 and found it to
result in improved performance? The 7030 is said to have such a robust
front end that additional filtering is the last thing I'd expect to
make a noticeable difference. In fact, I'd expect whatever tiny
improvement that resulted from the extra filter to be outweighed by
insertion loss.

However, I have an open mind about this--as well as a Kiwa highpass
filter, standing by.

Steve

wrote in message
oups.com...
This is interesting. Have you (or anyone else in the group) actually
used a preselector and/or highpass filter with a 7030 and found it to
result in improved performance? The 7030 is said to have such a robust
front end that additional filtering is the last thing I'd expect to
make a noticeable difference. In fact, I'd expect whatever tiny
improvement that resulted from the extra filter to be outweighed by
insertion loss.

However, I have an open mind about this--as well as a Kiwa highpass
filter, standing by.

Steve


Hi there Steve

I'm also interested in that Kiwa highpass filter you mentioned. They do the
mod for you too. What have you added to the 150 as improvements?

Lucky

I haven't really added anything. I already had the Kiwa highpass filter
(which is a very good filter) and have been using it to reinforce the
150's front end. The Kiwa filter completely eliminated what minor
problems I had with intermodulation. Otherwise the 150 works fine as it
is.

Steve

wrote in message
oups.com...
I haven't really added anything. I already had the Kiwa highpass filter
(which is a very good filter) and have been using it to reinforce the
150's front end. The Kiwa filter completely eliminated what minor
problems I had with intermodulation. Otherwise the 150 works fine as it
is.

Steve


Steve,

This is what Kiwa offers for the 150:
http://www.kiwa.com/HF150.html

Where did you get your highpass filter and did you install it yourself or is
it external?

Lucky

Yes, I have the external highpass filter sold by Kiwa. You can find
information about it he http://www.kiwa.com/bcb.html.

Since MW DX-ing doesn't interest me very much, and since it's a pain to
be tuning a preselector all the time, it's nice to have a filter like
this that will heavily attenuate *everything* below 2500 khz.

I.C.E. sells a comparable highpass filter (model 402), and I believe
Par Electronics does as well.

Steve

Hi Steve,

You are correct in your assumption. The preselector isn't really necessary.
My statement was purely theoretical.......I think that the only way you
would see a difference would be if you would have a few signal generators
hooked through isolators and combiners, set up at high output levels and
tuned to different frequencies.
This would allow you to see the multi-tone response under very adverse
conditions. Under these conditions, a preselector would help.
Do you need to do this in the real world? Not really, unless you were using
this receiver on a ship where there were several high power transmitters
being used at the same time.

Pete

wrote in message
oups.com...
This is interesting. Have you (or anyone else in the group) actually
used a preselector and/or highpass filter with a 7030 and found it to
result in improved performance? The 7030 is said to have such a robust
front end that additional filtering is the last thing I'd expect to
make a noticeable difference. In fact, I'd expect whatever tiny
improvement that resulted from the extra filter to be outweighed by
insertion loss.

However, I have an open mind about this--as well as a Kiwa highpass
filter, standing by.

Steve