Hi All,
> > What I want to see is someone design a tuneable preselector with many
> > adjustable parameters.
At these frequencies and with a load impedance of 50 ohms
you can come a long way with a good 1 mH inductor and a
tuneable capacitor in series with the antenna. The 1 mH
inductor is in the
On Tue, Feb 21, 2012 at 10:33 AM, Ken Alexander wrote:
> Hi All,
>
> I'm not sure what kind of parameters you'd like to be able to adjust
> Brian.
>
I don't think there are any besides frequency (tuning) and possibly preamp
gain.
> I think that if you put a good filter at the antenna jack and g
; ;
"flexradio@flex-radio.biz"
Sent: Tuesday, February 21, 2012 1:33:35 PM
Subject: Re: [Flexradio] The new 472-479 kHz band - REAL DX
Hi All,
I'm not sure what kind of parameters you'd like to be able to adjust Brian. I
think that if you put a good filter at the antenna
arol F. Milazzo, KP4MD/W6" ,
"flexradio@flex-radio.biz"
Subject: [Flexradio] The new 472-479 kHz band - REAL DX
Date: Tue, Feb 21, 2012 10:33 am
Hi All,
I'm not sure what kind of parameters you'd like to be able to adjust Brian. I
think that if you put a good filter at t
_
From: "Robert Costa, KB6QXM"
To: Brian Lloyd
Cc: "Carol F. Milazzo, KP4MD/W6" ;
flexradio@flex-radio.biz
Sent: Tuesday, February 21, 2012 12:48:24 PM
Subject: Re: [Flexradio] The new 472-479 kHz band - REAL DX
Brian,
Yes I agree about your
what if"
73,
Robert
KB6QXM
"Ham Radio Open Conversation"
Yahoo group owner/moderator
- Reply message -
From: "Brian Lloyd"
To: "Robert Costa, KB6QXM"
Cc: "Carol F. Milazzo, KP4MD/W6" ,
Subject: [Flexradio] The new 472-479 kHz band - REAL
On Tue, Feb 21, 2012 at 8:47 AM, Robert Costa, KB6QXM wrote:
> What I want to see is someone design a tuneable preselector with many
> adjustable parameters.
>
> Anyone up to the task. I will even build your website to market it.
>
Signal levels tend to be pretty strong unless using a small loop
arol F. Milazzo, KP4MD/W6"
To: "Brian Lloyd"
Cc:
Subject: [Flexradio] The new 472-479 kHz band - REAL DX
Date: Tue, Feb 21, 2012 8:39 am
I agree a bandpass filter makes sense for just 472-479 kHz. My low-pass
filter was intended for receiving the entire LF range.
Carol, KP4MD/W6
O
I agree a bandpass filter makes sense for just 472-479 kHz. My low-pass
filter was intended for receiving the entire LF range.
Carol, KP4MD/W6
On Tue, Feb 21, 2012 at 8:25 AM, Brian Lloyd wrote:
>
>
> On Mon, Feb 20, 2012 at 10:56 AM, Carol F. Milazzo, KP4MD/W6 <
> kp...@cfmilazzo.com> wrote:
On Mon, Feb 20, 2012 at 9:04 PM, Ralph W5JGV wrote:
> Don't get me wrong; I LOVE this rig, but I'm going to keep some of my old
> manually operated stuff as a backup, just in case.
>
The problem is that PowerSDR makes assumptions about how you want to use
the radio rather than just providing kno
On Mon, Feb 20, 2012 at 10:56 AM, Carol F. Milazzo, KP4MD/W6 <
kp...@cfmilazzo.com> wrote:
> Here is a description of a simple low pass filter with a 510 kHz cutoff
> frequency I built for my FLEX-3000 http://www.qsl.net/kp4md/lpfilter.htm
I still think that a tunable preselector makes more sens
> I am a newbe to flex but looking at your screenshot it looks like
> the preamp
> for RX1 is on and the preamp for RX2 is off. Could that be messing things
> up?
Sigh... I suppose this is what software radio is all about - frustration!!
I have NO idea how the preamp appears to be turned on in
+1 Thanks for the information.
On Mon, Feb 20, 2012 at 10:56 AM, Carol F. Milazzo, KP4MD/W6 <
kp...@cfmilazzo.com> wrote:
> Here is a description of a simple low pass filter with a 510 kHz cutoff
> frequency I built for my FLEX-3000 http://www.qsl.net/kp4md/lpfilter.htm
>
> Carol, KP4MD/W6
>
Here is a description of a simple low pass filter with a 510 kHz cutoff
frequency I built for my FLEX-3000 http://www.qsl.net/kp4md/lpfilter.htm
Carol, KP4MD/W6
___
FlexRadio Systems Mailing List
FlexRadio@flex-radio.biz
http://mail.flex-radio.biz/mailma
At 01:45 AM 2/20/2012, Ralph W5JGV wrote:
> Surprised at your observation, I checked my 5000a and noticed that if
> RX1 preamp is off, I get same results on both RXes at 485 KHz, but if
> RX1 preamp is on, the baselines are different and I see an apparent
> difference of 30-something dB.
>
> Are
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Ralph W5JGV
Sent: Monday, February 20, 2012 01:45
To: flexradio@flex-radio.biz
Subject: Re: [Flexradio] The new 472-479 kHz band - REAL DX
> Surprised at your observation, I checked my 5000a and noticed that if
> RX1 preamp is off, I get same results o
> Surprised at your observation, I checked my 5000a and noticed that if
> RX1 preamp is off, I get same results on both RXes at 485 KHz, but if
> RX1 preamp is on, the baselines are different and I see an apparent
> difference of 30-something dB.
>
> Are you using the same settings on both receive
On Sun, Feb 19, 2012 at 5:12 PM, Ken Alexander wrote:
> > One other thing that would be nice is to have an option to bypass the
> built-in front-end filters thus allowing selection of an external filter.
>
> It's not an option, but that's what my 1500 does right out of the box.
> The front end fil
From: "Tim Ellison, W4TME"
To:
Subject: [Flexradio] The new 472-479 kHz band - REAL DX
Date: Sun, Feb 19, 2012 5:19 pm
The FLEX-1500's low frequency hardware band pass filter starts to roll
off @ 490 KHz very rapidly.
Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio
-radio.biz
Subject: Re: [Flexradio] The new 472-479 kHz band - REAL DX
Surprised at your observation, I checked my 5000a and noticed that if
RX1 preamp is off, I get same results on both RXes at 485 KHz, but if
RX1 preamp is on, the baselines are different and I see an apparent
difference of 30
Tim,
Any comments on the filter rolloff in the 3000 and the 5000a?
73,
Robert
KB6QXM
"Ham Radio Open Conversation"
Yahoo group owner/moderator
- Reply message -
From: "Tim Ellison, W4TME"
To:
Subject: [Flexradio] The new 472-479 kHz band - REAL DX
Date: Sun,
y Flanders; Jeff Singer;
"flexradio@flex-radio.biz"
Sent: Sunday, February 19, 2012 8:03:52 PM
Subject: Re: [Flexradio] The new 472-479 kHz band - REAL DX
On Sun, Feb 19, 2012 at 3:05 PM, Ken Alexander wrote:
I just checked on my 1500 and what I notice is that when I change freque
from 481 kHz. All is
well on 481. It's a total mess on 480 kHz and below.
73 - Ken
From: Brian Lloyd
To: Ken Alexander
Cc: Jerry Flanders ; Jeff Singer ;
"flexradio@flex-radio.biz"
Sent: Sunday, February 19, 2012 8:03:52 PM
Subject: Re: [Fl
On Sun, Feb 19, 2012 at 3:05 PM, Ken Alexander wrote:
> I just checked on my 1500 and what I notice is that when I change
> frequency from 481 kHz to 480kHz whatever filter is currently in the front
> end is removed/bypassed because and the receiver front end is wide open to
> everything from medi
Surprised at your observation, I checked my 5000a and noticed that if
RX1 preamp is off, I get same results on both RXes at 485 KHz, but if
RX1 preamp is on, the baselines are different and I see an apparent
difference of 30-something dB.
Are you using the same settings on both receivers?
Je
r' ;
flexradio@flex-radio.biz
Sent: Sunday, February 19, 2012 12:58:40 PM
Subject: Re: [Flexradio] The new 472-479 kHz band - REAL DX
At 11:41 AM 2/19/2012, Jeff Singer wrote:
>Ken, I was likewise surprised by your statement about successfully using the
>Flex-1500 to receive 600 met
om now on.
73 - Ken
From: Jeff Singer
To: 'Ken Alexander' ; flexradio@flex-radio.biz
Sent: Sunday, February 19, 2012 11:41:48 AM
Subject: RE: [Flexradio] The new 472-479 kHz band - REAL DX
Ken, I was likewise surprised by your statement about successfully using
> My Flex-5000 is utterly deaf below the U.S. AM broadcast band. Can't even
> pick up local airport Non-Directional Beacons.
My F5K has RX2 installed. I have noticed that the sensitivity of RX1 is 37
dB poorer than RX2.
AT 7 MHz, the gain difference between the two receivers is only 1 dB.
And
-
From: flexradio-boun...@flex-radio.biz
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Jerry Flanders
Sent: Sunday, February 19, 2012 12:59 PM
To: Jeff Singer; 'Ken Alexander'; flexradio@flex-radio.biz
Subject: Re: [Flexradio] The new 472-479 kHz band - REAL DX
At 11:41 AM
At 11:41 AM 2/19/2012, Jeff Singer wrote:
Ken, I was likewise surprised by your statement about successfully using the
Flex-1500 to receive 600 meter ham beacons. I've read Flex discussion
boards for several years. To the very limited degree that users comment on
the lowfer receive performance o
Hi Jeff and all,
> But I do some longwave listening with my old Kenwood TS-850/HF
> vertical and often hear European AM broadcast stations in the
> 150-200 kHz range even from my QTH in Missouri. Radio France
> Inter can often be heard from local sunset until
> sunrise in Europe on 162 kHz. The
"Don't Sell Longwave Short."
Jeff
K0OD
From: Ken Alexander [mailto:k.alexan...@rogers.com]
Sent: Sunday, February 19, 2012 9:32 AM
To: Jeff Singer; flexradio@flex-radio.biz
Subject: Re: [Flexradio] The new 472-479 kHz band - REAL DX
I'm surprised the Flex-5000
down that far
that can be decoded with one's own ears.
"Don't sell longwave short."
I see a new bumper sticker in there somewhere! :-)
73,
Ken
VE3HLS
From: Jeff Singer
To: flexradio@flex-radio.biz
Sent: Sunday, February 19, 2012 10:02:51
ot;
I see a new bumper sticker in there somewhere! :-)
73,
Ken
VE3HLS
From: Jeff Singer
To: flexradio@flex-radio.biz
Sent: Sunday, February 19, 2012 10:02:51 AM
Subject: [Flexradio] The new 472-479 kHz band - REAL DX
My Flex-5000 is utterly deaf below the U.
My Flex-5000 is utterly deaf below the U.S. AM broadcast band. Can't even
pick up
local airport Non-Directional Beacons.
But I do some longwave listening with my old Kenwood TS-850/HF vertical and
often
hear European AM broadcast stations in the 150-200 kHz range even from my
QTH in
Missouri. R
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