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Interesting article in the recent issue of of RadCom Plus which like QEX. Dave W6VYC

If you have one built, let's put it in a VNA. Either a nanoVNA, or my Rigol. Cliff

The values can be scaled by the ratio of the frequencies. ie: 21/28 for the multiplier for the inductors and capacitors to scale to 10 meters. if you want to see the response of various filters, use a

Dave, Do you have any data in re how sharp/effective this filter is? I'd like to try building one (or more for other bands besides 21MHz). Hiroki AH6CY

These are the bandpass filters that have been used for years. Don't know if you can find them anymore. They are coupled resonator type filters using air core inductors. If you really want, you can

I meant Oct 2024, not Sept 2024. Begin forwarded message: From: Hiroki Kato <hiroki@...> Date: October 6, 2024 at 01:26:21 PDT To: [email protected] Subject: [QRPops] RadCom Sept 2024 Reply-To:

? Jeff’s call sign, AJ6WX, was corrected in the final printed version. The mag loop has been modified to allow 20m operation by adding an additional 50pF butterfly variable capacitor. Hiroki AH6CY

The Wizard of Portola Valley!

I don't sell the filters, Hans Summers does.? ?But my curiosity is? up.? I am going to build a filter and send it to Joy to try.

Hiroki strikes again this month with an article about his mag loop remote controller.? He credits Jeff Reagan for the dual stepper motor idea.? He also credits 6 others for help preparing the

Clif, Morgan filters look like the filters I would also recommend. Thanks for pointing them out.... Dave W6VYC

by the way, good catch on this book.? I'm really enjoying reading it. lotsa good stuff in there.? Cliff K6CLS CM87

my FTdx10 was getting massive front end overload from KNEW, KRE, etc., on the ROV long wire antenna. recently I bought a Morgan AM BCB filter. https://www.kf7p.com/KF7P/Morgan_Filters.html it is very

Doug, Good bandpass filters use air core inductors in a coupled resonator configuration which gives lower losses and better skirts. You used to be able to get these filters for around $100 for each

I plan to pop by the ops site, then bike, then dine (at Green Elephant) and then check out the PAARA goodies table. Best, --David KM6RI

Dave,? I am curious as to why you don't think a band pass filter can be home brewed.? I have seen several examples on you tube that seem to work fine.? And, back in the 90's, I used to go to the

The Tactical Radio Gear guy also sells the filters and diplexers of the kind used by multi-transmitter Field day sites. ?His QRP filter kit seem to be a lower-power implementation of the same. ?I

Joy was asking about how to use a bandpass filter to limit interference at the Baylands. I don't recommend that you buy the filter. It is difficult to build analog filters good enough to limit

I also plan to be at the Baylands for lunch and ops. I am staying for the PAARA meeting (USS Hornet Radio Station) and dinner at the Green Elephant.?Dave W6VYC

My trip to Grand Canyon was a real hoot.?? Now I am off to Vancouver for Microwave Update Conference.? https://microwaveupdate.org/Home