Re: Band Pass Filter High Attenuation
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Okay. That is helpful information.
A couple questions:?
1: Can I assume that I will for the most part tune the inductors together? To make the correct bandpass, they must all be the same value, right?
2: Can I attach a 50 ohm spectrum analyzer as I showed in the link? Or will the impedance mismatch cause the filter to not function properly?
On Tue, Jan 3, 2017 at 12:41 AM, iam74@... [BITX20] <BITX20@...> wrote:
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As I recall, this BPF is about 200 ohms in and out. If you used the IF transformers supplied with the kit, suspect first the coils of these transformers.? They are quite fragile and it is easy to get a poor or nonexixtent connection through them.
First, were they oriented right?
Second, it is easy to pull one of the pins out of alignment and even break the connection internally. Check them very carefully.
Third, there is a specific and quite narrow window which creates the bandpass. Triple check your alignment. The proper final inductance should be about 4 uH (for 20m).
Hope this helps.
john
AD5YE
---In BITX20@..., wrote : Greetings all.
I seem to have an issue with my Band Pass Filter.
This was built using the components from Sunil Lakhani on eBay.
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The entire schematic is here:?
-- Mark Baldridge 608.561.3853
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