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73, Eric NF6S ex WD6DBM ?

If you look at the tiny low pass filters (toroids plus capacitors) on the circuit board of your uSDX or QDX, that's the size of filtering you need for QRP bandpass filters for 10M or bandstop filters

Doug, yes the most I run is 10 W and usually less. I hear interference, mostly from CW stations. I'm not sure if they are on the same band that I am on or not. It seems to me it bleeds to some of the

Dave, Do you mean the cafe at noon and ops at about 1:30pm? I think those are the normal times. I am planning on coming to both. Joy N6GO

I will not be there today. I have out of town guests. See you (at least some of you) at Pacificon next week. Hiroki AH6CY

Planning to join y'all for lunch, ops and bike. Best, --David KM6RI

I'll be entertaining my favorite kindergartner while her mom goes to the first parent/teacher conference.? There is a small chance I'll get out to the ops afterwards.? If not, next week. Dick

I plan to be at the Bay Cafe for lunch and ops at the Baylands around 1:30 Dave W6VYC

Thanks Dave, I don't think the clock in my 7300 has ever been correct. Thanks for passing this fix on. I will forward to my engineering department, my husband. Joy N6GO

Very? interesting postings.? But are we using a cannon to kill a fly?? These filters are all good and do the job I am sure.? But they are expensive,? and handle hundreds of? Watts. Joy runs qrp.

How many of us have a 7300 with the clock battery run down and time constantly needs setting. Here is a nice solution by installing a rechargeable battery LR 2032 and a 1K resistor. IC7300 extra clock

This is the original source of the S Tuner design that was in the FARS homebrew contest. The unit at FARS was nicely built in a non-conductive wooden/plexiglass box. He claimed this tuner architecture

Christopher, Nice looking products with very good adjacent band rejection. The low power toroid versions are reasonably priced. Dave W6VYC

We (AB6RF and me) have been pretty happy with K6WX's filters and diplexers at Pacificon. We rarely run more than 500W on any station (due to AC power limitations). They run cool; we have never plugged

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: