Topband: BCB Filter Recommendation?

[donovanf at starpower.net]

Ed, 


If your receive loop has a preamp at its feed point, its very likely 
that the preamp is being overloaded by the nearby BCB station. 


If that's the case, a filter after the preamp will not help. 


73 
Frank 
W3LPL 

----- Original Message -----

From: "Edward" <navydude1962 at yahoo.com> 
To: donovanf at starpower.net 
Sent: Thursday, April 16, 2020 9:51:51 PM 
Subject: Re: Topband: BCB Filter Recommendation? 

Yes. I have a receive only loop. Thanks for the link. Will check it out. 

> On 17 Apr 2020, at 00:49, donovanf at starpower.net wrote: 
> 
> Hi Ed, 
> 
> Do you currently route your 160 meter antenna through the receive only input? 
> If not, you must have the capability to do so to use this filter. 
> 
> This is by far the least expensive 160 meter receive filter and its rejection 
> at 1400 kHz is approximately 60 dB. But you have to build it yourself 
> from inexpensive components. Its a band pass filter so you'll need to 
> bypass it to operate on other bands. Countless hundreds of these 
> 160 meter filters have have been built. 
> 
> www.k1ttt.net/technote/w3lplfil.html 
> 
> 73 
> Frank 
> W3LPL 
> 
> ----- Original Message ----- 
> 
> From: "Edward" <navydude1962 at yahoo.com> 
> To: donovanf at starpower.net 
> Sent: Thursday, April 16, 2020 9:35:34 PM 
> Subject: Re: Topband: BCB Filter Recommendation? 
> 
> I have receive-only inputs on my rigs. 
> 
> On 17 Apr 2020, at 00:07, donovanf at starpower.net wrote: 
> 
> Hi Ed, 
> 
> Does your station layout allow you to use a receive only filter? 
> 
> 73 
> Frank 
> W3LPL 
> 
> ----- Original Message ----- 
> 
> From: "Edward" <navydude1962 at yahoo.com> 
> To: donovanf at starpower.net 
> Sent: Thursday, April 16, 2020 8:36:59 PM 
> Subject: Re: Topband: BCB Filter Recommendation? 
> 
> 
> Thank you, Frank! 
> 
> 
> On 16 Apr 2020, at 22:06, donovanf at starpower.net wrote: 
> 
> Hi Ed, 
> 
> What is the frequency of your local BCB transmitter? 
> 
> This is the best brickwall filter -- capable of handling 200 watts -- 
> that money can buy. Its provides at least 40 dB of attenuation below 
> 1700 kHz. Several PVRC members located within a few thousand 
> feet of a 50 KW 1500 kHz BCB transmitter use them with excellent 
> success. 
> 
> www.dxengineering.com/parts/dlw-fl1718 
> 
> Less expensive filters work fine if your local BCB transmitter is below 
> 1500 kHz. You can save even more money if you can place the filter 
> before the receiver input to your radio, so the components don't have 
> to be rated for 200 watts. 
> 
> 
> 73 
> Frank 
> W3LPL 
> 
> ----- Original Message ----- 
> 
> From: "Edward via Topband" <topband at contesting.com> 
> To: topband at contesting.com 
> Sent: Thursday, April 16, 2020 6:34:21 PM 
> Subject: Topband: BCB Filter Recommendation? 
> 
> Greetings, 
> 
> I am getting clobbered by a local BCB transmitter, making 160M unusable, even with a dedicated RX antenna. 
> 
> As for filters, I have narrowed it down to the ICE and the Kiwa. Kiwa seems to be the more serious filter, as they publish their specs in great detail. ICE does not. 
> 
> Any other filter I should consider besides these two? 
> 
> Thanks, 
> Ed 
> 7Z1ES