|Subject:||Re: LF: Anyone good with Elsie?|
|From:||DK7FC <[email protected]>|
|Date:||Thu, 23 Aug 2018 14:55:59 +0200|
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|References:||<[email protected]> <[email protected]> <[email protected]> <[email protected]>|
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Hi Chris, Am 23.08.2018 14:38, schrieb Chris Wilson:
Yes, sure. You see what you need to see. The perfect tool. I also use SpecLab to check filter curves...My method of testing is a wide band commercial noise source and two series wide band amps to up the level to something useable by my SDR, then look at the BPF filter action on the display in HDSDR. I have a spectrum analyser but am not very good with it, given the comfort I have using HDSDR I am probably better keeping it simple! Sound OK?
For what do you need the BPF? Just for fun or do you have serious problems with DCF39 and HGA22? In the last case you may need to put some effort in the Q of the coils to get a sharper slope. Hand wound coils on pot cores, using RF litz wire seems to be best. I reached a Q of > 500 if i remember correctly.
But somehow my results have never been really satisfying... 73, Stefan
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