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20 plus talking range back in the day now cant talk across town...why

K6EEN

Member
Joined
Sep 17, 2020
Messages
18
Location
Albuquerque
The filter is interesting and to be honest I have never seen one..
They've been around a long time. Mostly used by the amateur radio "multi-operator HF contesting" crowd, where you have a few radios set up all near each other in a room operating different bands in a competition setting, one 80 meters, one 40 meters, one 20 meters, one 10 meters, etc. Each operating position has a bandpass filter for the band to which the radio is tuned. Keeps the radios/antennas in close proximity from interfering with one another. But the bandpass filters can be useful when there is a lot of HF junk and you want to attenuate all out-of-band noise to maximize your in-band receiver sensitivity. If all you have between the antenna and your IF filter is the RF front end on a cheap CB radio, adding some external RF bandpass filtering can improve the receive capability.

Link to HF contesting definition:
Contesting (a.k.a. Radiosport)
 
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slowmover

Member
Premium Subscriber
Joined
Aug 4, 2020
Messages
149
Location
Fort Worth
I have the 411cb and consider a bandpass filter on 11m as essential in the mobile.

There are other brands to also consider.

I’m going to try others as well.

The other item (and has precedence) is the WEST MOUNTAIN RADIO CLEARSPEECH DSP SPEAKER.

That piece of Amateur gear (DSP) badly, badly needed in 11m.

Will change your life.
.
 

Retroradio

Member
Joined
Jan 4, 2015
Messages
267
Location
Ontario
Ive run a three different external DSPs on HF and they worked very well but what I found for me that it was just more playing to find the setting and albeit it helped but the change in tonality of the sending station bothered me.
After awhile just shelved them. I didn’t find them to be the silver bullet I had hoped for.
 

K6EEN

Member
Joined
Sep 17, 2020
Messages
18
Location
Albuquerque
I have the 411cb and consider a bandpass filter on 11m as essential in the mobile.
I'm curious what the 11 meter bandpass filter does for your mobile install. The noisiest thing in my various HF/CB mobile installations over the years has been ignition and fuel pump noise from my own vehicle at S1 to S3 levels, not strong out-of-band stuff. But I really only operate HF mobile or CB on the open interstate (desert southwest) and not around town, so there's not a lot of RF noise sources in the middle of the desert. I imagine if you're driving around a big metro area with the CB on, some extra RF bandpass filtering could be very helpful.
 

slowmover

Member
Premium Subscriber
Joined
Aug 4, 2020
Messages
149
Location
Fort Worth
I'm curious what the 11 meter bandpass filter does for your mobile install. The noisiest thing in my various HF/CB mobile installations over the years has been ignition and fuel pump noise from my own vehicle at S1 to S3 levels, not strong out-of-band stuff. But I really only operate HF mobile or CB on the open interstate (desert southwest) and not around town, so there's not a lot of RF noise sources in the middle of the desert. I imagine if you're driving around a big metro area with the CB on, some extra RF bandpass filtering could be very helpful.
All’s I can truly say is that desperation is the mother of acquisition.

One can get relatively good performance in a Class 8 fleet-spec truck. But the relativity isn’t with personal vehicle much less base station installations.

Same radio installed in all three makes a bigger jump to the former than the former does to the latter.

I figure that “if” competing signals are attenuated, then 11-Meter ought to be easier in which to control “noise”.

The MO411cb isn’t a change on par with a West Mountain Radio CLEARSPEECH DSP Speaker but it does clear several species in the underbrush.

I probably have $90-$100 in ferrites in any given radio stack configuration (and including those outboard to it).

Is it the equivalent in cost-effectiveness? Close enough.

Current stack is:

1). Radio
2). PALOMAR ENGINEERS cmnf-500 coax filter
3). RM ITALY KL-203
4). MORGAN 411cb band pass
5). Co-phase coax harness with both ft240 -31 & -61 toroids wound into it.

I’m willing to try what’ll work. With 2-3 other systems to complete (all in some phase of work ongoing), supply and gear budget is open.

Anyone else gone thru a 1,000-count zip-ty package this past year?

.


Oh, and as I’ve never put on a mask for anyone, anywhere (moral cowardice not my style), I also don’t have it muffling TX.
 
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