The New and Improved Broadcast Interference Filter from K9DP

If your Xiegu radio suffers from BCI (Broadcast Interference from the AM band), you'll want this filter! If your radio doesn't... you must not be close to an AM broadcast station!
Here are some links to Dan's filters:
👉 F-F Kit: geni.us/lVZ4
👉 F-F Pre-Built: geni.us/cV7MO
👉 M-F Kit: geni.us/h1a7ak
👉 M-F Pre-Built: geni.us/OBIxLU
Check out Dan's website at: www.k9dp.com/
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[@JReed305]

I grabbed one of the pre built ones for use with my G90 for POTA. SoCal has a LOT of strong AM Broadcast Stations and they caused havoc with the G90 especially with imaging on the 15m band. This filter eliminated the issue with the bonus that it is so much smaller than the VK3IL filter I built for in the shack.

[@temporarilyoffline]

Double Nice! Glad it worked for you!

[@K3JRZOnTheAir]

Very nice! I haven’t had such issues before, but good to know this product is out there. 73!

[@temporarilyoffline]

It's a great idea for xiegus

[@DonzLockz]

Nice gadget. Hope Xiegu have sorted this in their new mysterious tranceiver. :)

[@temporarilyoffline]

I hope so too

[@makskk6spm275]

I bought one as you suggested. Works great! The band much cleaner now. Thanks!

[@temporarilyoffline]

Glad you like it!

[@victorcharlie7491]

"Do it right do it once, Do it wrong do it twice" lol xiego, great video man!

[@temporarilyoffline]

Hey, thanks!

[@TinyTJ04]

This is going to be handy for a lot of people I think.

[@temporarilyoffline]

Yes it is!

[@KK6USYHamRadioAdventures]

That's pretty cool , nice job he did on that filter!

[@temporarilyoffline]

I think so too!

[@texasyojimbo]

Another thing to keep in mind is that a BCB low pass filter is probably going to attenuate less at the high end of the band (1550 is pretty high) than in middle and lower AM BCB. Also ham antennas are going to be closer to an effective length the higher the frequency.

[@temporarilyoffline]

Thanks!

[@W6IWN_Radio]

Looks like an improvement from the last model. Thanks for the detailed demo! I wouldn't mind having one for my G90.

[@temporarilyoffline]

Yeah, a pretty good improvement! Check the links in the description, he has kits and pre-built units.

[@GSWEAR66]

I bought one of these for my G90 and it works great!!

[@temporarilyoffline]

Great to hear!

[@timothystockman7533]

920 WBAA, Purdue University. I used to work there! They run 5 kW day, 1 kW night. Used to be a Collins 21A transmitter, then a Harris MW5A, now it's a solid state rig. -- de N3TS

[@temporarilyoffline]

That's awesome, I bet that was a lot of fun.

[@vu3mes]

A great acessory to have in a shack.

[@temporarilyoffline]

Sure is!

[@phillyedhrj]

Perfect for metro areas.

[@temporarilyoffline]

Sure is!

[@KN4VA]

Excellent. Thanks. Always enjoy a kit to work with. Having a G90, this will be awesome. - KN4VA

[@temporarilyoffline]

Right on!

[@Ratchet2]

Just bought one for my X6100. Thanks

[@temporarilyoffline]

Sweet. Hope it helps!

[@phillyedhrj]

Rejecting Sports Talk Radio... Noice.

[@temporarilyoffline]

Right!

[@dan_in_sd]

I did a YT video not too long ago about the same thing. I found a BCB filter from Morgan Systems (Salt Lake UT) . The filter from Morgan is a solid box with SO-239 connectors. Pretty rugged. Worked pretty well too. I had a 1kw radio station at 1450AM that was causing me a headache on the G90 for 40m and 20m band. Nice video ;)

[@temporarilyoffline]

Thanks Dan!

[@dan_in_sd]

@@temporarilyoffline Did Dan K9DP ever say what the power rating is on the filter? Have you tried 20W FT8 through it yet?

[@temporarilyoffline]

@dan_in_sd he's had good reports of 20w, but I don't know about FT8. He's on the discord. Probably matters if it's hot out too...

[@robertmeyer4744]

That will be great on some radios and some SWL radios. I worked a park with a AM station right buy. did not have a problem with my ICOM 7300. it did cut my RX a bit on 160 meters . but not a problem. the only trouble with this filter I see is trying to work 160 meter band. this would cut TX and RX on that band, but 80 meters and up will be fine. I don't hear that problem with a IC 705 or 905. my real old Icom 725 does not suffer from this. but a lot of radios do. I know a few parks with a AM station right buy. great place to build a crystal radio. great for a SOTA/POTA kit. 73's

[@temporarilyoffline]

I haven't heard of the 705 having this problem either.

[@lunarbluesmusic]

My 6100 is unusable on FM, can only hope that they consider fixing it one day as it's marketed and sold as a HF all mode radio " Apart from FM "

[@temporarilyoffline]

I haven't really explored FM on any of my HF rigs. I need to do that.

[@WECB640]

Why do we see S3 on the meter when the antenna is disconnected? Yes, a MW filter is always very useful on these "wideband" radio types. Days of old had good rejection and that rejection to out of band signals was a sales point. Today, the sales point has flipped to being able to hear everything from DC to daylight. I think having a few inline filters offers the best flexibility for the many changing situations we encounter. Great review T.O. 73

[@temporarilyoffline]

The short answer is "because xiegu" 🤣

[@WECB640]

LOL! I wonder if there is a way to align it. Not that that matters much because everyone is "5 by 9".@@temporarilyoffline

[@temporarilyoffline]

@WECB640 I won't know what to do for signal reports at the top of the solar cycle! I've always thought with all the filters and dsp and such that we really don't know what radio was like back then.

[@JonathanKayne]

This is why i got rid of my x6100. A $600 radio should not suffer from something so simple to remedy. I can accept it on the g90 since we are talking about a $400 radio. I REALLY hope that Xiegu fixes this issue on their new radio but I doubt they will.

[@temporarilyoffline]

I agree!

[@P.SeanCoady]

I was going to say the same thing. Bandaid

[@gravestonemyth]

I noticed that the problem is more pronounced when I use an EFHW. The problem disappears when using my 6BTV. I have also seen it to a far lesser degree with my IC7300. My Elecraft rigs are immune. I;m in the Chicago market with three clear channel stations.

[@temporarilyoffline]

How is your EFHW setup compared to your 6BTV (Vertical) - I wonder if that has something to do with it?

[@hedgiehogUK]

Ooh just a thought… from the video thumbnail I thought this was about why we should NOT buy the filter (reject this). I can see now where the arrow is pointing, but I had completely misunderstood before watching the video. Just in case your buddy needs the positive marketing 👍

[@temporarilyoffline]

Nice catch

[@SteveBerwick]

Is this specific to the xiegu? Does your IC705 already have broadcast filters built-in?

[@JonathanKayne]

Yeah it's a Xiegu thing. ICOM, Yaesu, elecraft all made sure their filters properly block the broadcast AM bands in their frontend. You could probably be two feet from the station antenna and still not hear a thing on the 705. Xiegu doesn't seem to care.

[@temporarilyoffline]

There are some other recievers (I don't have a list) that are effected, but the 705 isn't one of them (although it has other problems)

[@DennisMathias]

So you can transmit through this? Wouldn't an attenuator on receive do the same thing? And a basic question, are you hearing this station out of band..i.e., are you hearing it on 75 meters. What prompted you to research a device like this? Now, 160m would be desireable too and I don't think this is going to work for that. What's needed is a type of preselector or a series of filters to 'notch out' the broadcast band. Or ideally really good front end filters that track with tuning. Roofing filter if you will. Shortcoming with the radio I would say.

[@temporarilyoffline]

Yes. You can TX through it, but you can't auto-tune with it in place (remove, tune up, replace). Lots of people complained about the Xiegu AM overload, Dan stepped up with a solution. What this manifests as is an almost completely useless radio when there is a nearby strong AM transmitter.

[@wild-radio7373]

Cool ♡

[@temporarilyoffline]

There she is!

[@gliderrider]

Wonder if this will work on my (tr)uSDX? I don’t see why it wouldn’t. Maybe even my cricket. I’m a mile from a strong AM station.

[@temporarilyoffline]

It will work on any QRP radio that suffers from Broadcast Interference.

[@W4YDL]

My filter worked great the first three times I used it. Now, the lowest SWR I can get is 2:1, and I see some interference in the waterfall. No idea how I "broke" the damn thing, either

[@temporarilyoffline]

Check in with Dan, he might know

[@johncheyney3515]

Can you give me the link to the case for the NanoVNA/TinySA. The card did not show in the video.

[@temporarilyoffline]

Here you go: kzbin.info/www/bejne/f2PWh6age9ysb7c

[@ireadursoul]

I see you are using oficial firmware right? You prefer it?

[@temporarilyoffline]

I switch back and forth, I like them both. Oleg just put out 0.17.0 and I need to take a look!

[@jundyrb]

What's the difference between the first and second version? What's the new improvement as you said in the title of your video?

[@temporarilyoffline]

It filters better than the older version. Good point though, I should have measured them both side by side.

[@joeblow8593]

I'm glad that they are available, but it's a shame that they have to be used for Xiegu radios.

[@temporarilyoffline]

Right, xiegu isn't the first or only, just the current most popular offender.

[@av3510]

How is it "new and improved"? Just the connectors? I ordered and built one after your last video. It works ok, but I am about a mile from a 10,000w AM station and it can't fully repress that signal. The station goes down to 2000w at night and it works much better.

[@temporarilyoffline]

Dan says it filters out more in this version. If you have a VNA, compare yours to what I show in the video and see if it will help more.

[@wa4aos]

Has anyone checked for attenuation, hopefully none, at the 630 meter band, 472-479KHz, below the AM broadcast band?

[@temporarilyoffline]

I show a chart the video

[@wa4aos]

your video with the VNA only goes down to 500KHz but looking at the slope the attenuation will be high at 472-479KHz., Looks like I'll have to design a low pass filter which will pass below and attenuate above 500KHz. Being an E.E, has it's advantages... 73 Glenn WA4AOS@@temporarilyoffline

[@temporarilyoffline]

@@wa4aos good idea Glenn! Reach out to Dan, he might have a better chart.

[@ksink74]

How much power is it rated for?

[@temporarilyoffline]

20w, so its a good match for the G90 as well.

[@ksink74]

@@temporarilyoffline Good to know. Thanks.

[@mikesmithg0rfd356]

it will stop top band how will talk about what herts. hihi

[@temporarilyoffline]

I'm not old enough for top band yet...