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Filter values for 160m QDX?

Nate Reik N8BTR All Messages By This Member #116842 I've seen discussion about the possibility of building a 160M QDX-M... But haven't found anyone that's documented doing it, other than Hans saying he ran some WSPR on one? I see filter values for someone's 2200m build, but curious if anyone has done a 160m QDX-M build, and if they could share what they worked out for BPF and LPF values? -Nate N8BTR
Joe Atkinson W5CRN All Messages By This Member #116883 I would like to know how to build a 160 meter QDX-5. I am working a? few stations with My Phaser.. There are a lot of stations on the band running FT8
James Ervin All Messages By This Member #116890 Perhaps you could borrow the values from the 160m QCX? toggle quoted message Show quoted text On Sat, Jan 20, 2024 at 1:43?PM Joe Atkinson W5CRN via <pjatkin36=[email protected]> wrote: I would like to know how to build a 160 meter QDX-5. I am working a? few stations with My Phaser.. There are a lot of stations on the band running FT8 -- ジェームズのメール
James Ervin All Messages By This Member #116891 On Sat, Jan 20, 2024 at 5:04?PM James Ervin <ervinhfamily@...> wrote: Perhaps you could borrow the values from the 160m QCX? On Sat, Jan 20, 2024 at 1:43?PM Joe Atkinson W5CRN via <pjatkin36=[email protected]> wrote: I would like to know how to build a 160 meter QDX-5. I am working a? few stations with My Phaser.. There are a lot of stations on the band running FT8 -- ジェームズのメール -- ジェームズのメール
Paul - AI7JR All Messages By This Member #116900 开云体育 The diode band switching for filters doesn't work as well below 80M. IIRC I've seen conversations about single band versions for 160 and below, but no multi-band setups. 73, Paul -- AI7JR On 1/19/24 18:05, natereik@... wrote: I've seen discussion about the possibility of building a 160M QDX-M... But haven't found anyone that's documented doing it, other than Hans saying he ran some WSPR on one? I see filter values for someone's 2200m build, but curious if anyone has done a 160m QDX-M build, and if they could share what they worked out for BPF and LPF values? -Nate N8BTR -- Paul -- AI7JR
Nate Reik N8BTR All Messages By This Member #116909 ? ?On Sat, Jan 20, 2024 at 05:04 PM, James Ervin wrote: Perhaps you could borrow the values from the 160m QCX? James, That would be too easy! :-) The QCX uses a Class E PA, which Hans says is "rich in harmonics." So he has to use a 7 element filter with 3 inductors and 4 capacitors to get a sharper/deeper filter. The QDX uses a Class D Push-Pull amplifier, and the 2nd harmonic is naturally reduced, so on the QDX one can use a 5 element filter with 3 capacitors and 2 inductors. This means it's not easy or simple to use Han's LPF circuit from the QCX or the LPF kits in the QDX. Also, the receive circuit of the QDX has a different bandpass filter setup than the QCXs. So while I can easily calculate a likely L-C combo needed, was just trying to see if someone had already done this and confirmed....no need for me to reinvent the wheel. :-) Just figured I'd ask here first. If I build one, I'll be sure to share what values I land on!? On Sat, Jan 20, 2024 at 09:59 PM, Paul - AI7JR wrote: The diode band switching for filters doesn't work as well below 80M. IIRC I've seen conversations about single band versions for 160 and below, but no multi-band setups. 73, Paul -- AI7JR Paul -- AI7JR Paul, I'd read this too, which is why I was staying away from trying to cram 160m into a multi-band, and mentioned the QDX-M. I'm not sure if Joe was talking a 5 band QDX or Rev 5 QDX-M.? -Nate N8BTR
Joe Atkinson W5CRN All Messages By This Member #116974 I mean the QDX-M

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