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Jerry, This is the nth time where N is greater than 3.? ;) You put two signals into a DBM and you get all the possible sums and differences for the first two and all the harmonics of those two and

Allison, I agree with that totally, 25 dB down 2Mhz over is a tall order for any LPF. So that's how much it has to be reduced ? Oh, well, at least we're on the same page. Thanks. 73 Kees K5BCQ

Glenn, For an interum board look at CoilCraft at the larger but not huge parts.? I have the 20M slopbucket and the band pass filter for TX is SMT and the RX Inptut filter is SMT. It works well (no

Warren's Spectrum Analyzer screenshot of 2W out on 15m shows the 23mhz spur to be 50dB down, which is fully compliant.? ?? ??/g/BITX20/photo/65861/2?p=Name,,,20,1,0,0 Of course,

MadRadioModeler, I understand and knew that.? Those that don't build or haven't in the last 25years?may even remember that.? However someone else seems to be out in the wild about it. Its easy to

Kees, spur's frequency of ~23MHz ? The existing uBITX 20/17 LPF?IF USED ON 15m?actually is ~0.5dB down at 21.450MHz and the ~23.xxMHz spur is down ~6dB.? Save for the built in filter (existing)

Hi I can't tell you with certaintity if it's ok but i would err on the side of caution. glenn

HI Glenn, Relays on ebay. I can clean you that los RX trace, as you say it will be fex with coax from the other side.... But do remember that the board will be have a copper flood top and bottom

My reference was to the operating classes that were on all of our FCC (and like) tests… (Jerry don’t speed read). Sent: Monday, August 13, 2018 8:24 PM To: [email protected] Subject: Re:

Nick, where are you getting Omron G6S-2 relays for $1.30? AUD$ or US$? The HK19F-DC 12v are a very common type and cheap on ebay. Pinout is same as the ones used in uBITX.? US$?? 40c.? You have

Nick, Now we're cooking. Great basic relay switched LPF board. Relay control TBD. 73 Kees K5BCQ

Allison, Yes, I agree with all that....and when you are on 15m and you have a ~23MHz spur ....if your LPF is designed to cover 20/17/15 (using the values I gave earlier), would it not be nice to have

Just a taste so far:

MadRadioModdder, ?There are people I suspect have forgotten more than I know.? I keep that in my head. After 50 years in the industry as tech, Engineer I do not know it all.? I work at learning

Timothy, You have restarted a *14 year old* topic! Its dead, need a shovel? Allison

Kees, Even if using the existing 20/17 LPF "as is" on 15m, the 15m signals are ~0.5dB down and the 23.xx MHz spur is 6-7dB down vs 0 dB down on the 15/12/10 LPF. You can sharpen up the original LPF

HI All. I am still working on my new LPF board. I actually plan on using Omron G6S-2 relays. they are 5V, so i might look at changing them to a 12v version, Or using a regulator to get TX-5V. I like

I found that only microsd cards which said Hc1 or UHC1 worked for me. Class did not matter. Joe Ve1bwv

Note went "poof" so here it is again...... You could even use relays on the board so the RF lines are short and wire over to a 6 position, 8 position....whatever, for selection. Wait for the dust to

That's very promising!