Hello Brent...
I'm thinking about the same approach, using the QRPLabs LPFs. I'm only interested in 40/30/20/17 for now so I bought LPFs for those bands along with the relay board. I have them all assembled now and am looking at how to select them. It looks like a fairly simple code change...I'm looking into the wiring now.
Of course it dawned on me after the fact that I could probably do like you suggest and get full coverage from only four filters. It seems to me like that would work. Oh well...
BTW, the relay board uses jumpers to configure it so you can set it up to not keep the first relay in the circuit.
73... Mark AA7TA
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On 9/8/18 12:43 PM, Brent Seres/ VE3CUS wrote:
Thanks Jerry
I was thinking of taking Allison's advice and either using the existing parts on a new board, or getting the qrp-labs kits and relay board, and use 60m low pass for 80/60, 30 m for 40/30, 17m for 20/17, and 10m for 12/10. I think this should work, since the even harmonics are already fairly well attenuated, but I'm open to the advice of others. I see the qrp-labs board keeps the 10 meter filter always in line, so it would be simple to change the code so you were only toggling 1 bit at a time.
I have the 45 mhz filters on order, so between that and a better LPF layout, we maybe have a workable solution
Suggestions more than welcome
Brent
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