"Gregg" wrote:

| IF BW of 2.5KHz 6KHz and 10KHz per side band for itelligibillity through
| audio quality.

I dunno about the 10 kc, Gregg. I'd go for
something really tight, at NRSC BW. Anything
wider than that, you're just asking for noise.

73,

Steve Lawrence
Burnsville, MN


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SMHL,

IIRC: DRM requires 12kHz or 15kHz.
So the first two are A-OK at 2.5kHz and 6kHz; but a third at 12/15kHz
would made the radio's IF Section up-grade-able to DRM is desired.


jm2cw ~ RHF
..
..
= = = "Stephen M.H. Lawrence"
= = = wrote in message link.net...
"Gregg" wrote:

| IF BW of 2.5KHz 6KHz and 10KHz per side band for itelligibillity through
| audio quality.

I dunno about the 10 kc, Gregg. I'd go for
something really tight, at NRSC BW. Anything
wider than that, you're just asking for noise.

73,

Steve Lawrence
Burnsville, MN


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Okay, gotcha, RHF. My thought on the thing is that the
Ten - Tec RX320D model has DRM capability, and is
priced right for that application. I wonder when or if we
will ge DRM for mediumwave?

At any rate, point taken.

73,

Steve

"RHF" wrote in message
om...
| SMHL,
|
| IIRC: DRM requires 12kHz or 15kHz.
| So the first two are A-OK at 2.5kHz and 6kHz; but a third at 12/15kHz
| would made the radio's IF Section up-grade-able to DRM is desired.
|
|
| jm2cw ~ RHF
| .
| .
| = = = "Stephen M.H. Lawrence"
| = = = wrote in message
link.net...
| "Gregg" wrote:
|
| | IF BW of 2.5KHz 6KHz and 10KHz per side band for itelligibillity
through
| | audio quality.
|
| I dunno about the 10 kc, Gregg. I'd go for
| something really tight, at NRSC BW. Anything
| wider than that, you're just asking for noise.
|
| 73,
|
| Steve Lawrence
| Burnsville, MN
|
|
| ---
| Outgoing mail is certified Virus Free.
| Checked by AVG anti-virus system (http://www.grisoft.com).
| Version: 6.0.515 / Virus Database: 313 - Release Date: 9/1/03


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That wide bandwidth would be pretty nice, but what I am shooting for is a
DXing machine. With that wider bandwidth, I am not sure if we would need
good group delay characteristics, but I do know that the IP3 of the 2nd
mixer would suffer from out of bandpass signals. I do like the idea of the
2.5kHz bandwidth, but right now, Murata has discontinued production of the
CFJ/CFR series of filters that have that bandwidth. I would surmise that
the larger manufacturers have made a lifetime buy of those filters. I think
that the only option for a narrow bandwidth filter is the Mechanical FIlter.

Pete

RHF wrote in message
om...
SMHL,

IIRC: DRM requires 12kHz or 15kHz.
So the first two are A-OK at 2.5kHz and 6kHz; but a third at 12/15kHz
would made the radio's IF Section up-grade-able to DRM is desired.


jm2cw ~ RHF
.
.
= = = "Stephen M.H. Lawrence"
= = = wrote in message
link.net...
"Gregg" wrote:

| IF BW of 2.5KHz 6KHz and 10KHz per side band for itelligibillity
through
| audio quality.

I dunno about the 10 kc, Gregg. I'd go for
something really tight, at NRSC BW. Anything
wider than that, you're just asking for noise.

73,

Steve Lawrence
Burnsville, MN


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Behold, Stephen M.H. Lawrence signaled from keyed 4-1000A filament:


"Gregg" wrote:

| IF BW of 2.5KHz 6KHz and 10KHz per side band for itelligibillity
through | audio quality.

I dunno about the 10 kc, Gregg. I'd go for something really tight, at
NRSC BW. Anything wider than that, you're just asking for noise.

Besides the DRM noisemakers, there's still a few stations smart enough to
use Khan ;-)

--
Gregg
*Perhaps it's useful, even if it can't be SPICE'd*
Visit the GeeK Zone - http://geek.scorpiorising.ca

I wish they all would, Gregg!

73,

Steve


"Gregg" wrote in message
news:WZM7b.105483$kW.105432@edtnps84...
| Behold, Stephen M.H. Lawrence signaled from keyed 4-1000A filament:
|
|
| "Gregg" wrote:
|
| | IF BW of 2.5KHz 6KHz and 10KHz per side band for itelligibillity
| through | audio quality.
|
| I dunno about the 10 kc, Gregg. I'd go for something really tight, at
| NRSC BW. Anything wider than that, you're just asking for noise.
|
| Besides the DRM noisemakers, there's still a few stations smart enough to
| use Khan ;-)
|
| --
| Gregg
| *Perhaps it's useful, even if it can't be SPICE'd*
| Visit the GeeK Zone - http://geek.scorpiorising.ca


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