I would prefer a table radio like a Tivoli or old KLH21


Ceratinly some DRM capability, or a place to add a plug-in card which could be
either DRM, C-QUAM stereo, or the digital AM (IBOC or Kahn?).

Depending on how the digital standard goes, at least the RF could be constant.

10/9 khz tuning (US vs Euro)

Noise blanker

An input for a loop antenna

An input with DC phantom power for an outdoor active antenna

Maybe an antenna switch to switch between lop and other antenna, or two loops.

Good tone controls

Perhaps something like the old Scott DYNAURAL circuit which shaped the flatness
of the audio depending on signal strength, or something like Worcester's AM
circuit which made the IF passband narrower as the signal strength decreased.

Good speaker!

Behold, Radioman390 signaled from keyed 4-1000A filament:

I would prefer a table radio like a Tivoli or old KLH21


Ceratinly some DRM capability, or a place to add a plug-in card which
could be either DRM, C-QUAM stereo, or the digital AM (IBOC or Kahn?).

Depending on how the digital standard goes, at least the RF could be
constant.

10/9 khz tuning (US vs Euro)

Noise blanker

An input for a loop antenna

An input with DC phantom power for an outdoor active antenna

Maybe an antenna switch to switch between lop and other antenna, or two
loops.

Good tone controls

Perhaps something like the old Scott DYNAURAL circuit which shaped the
flatness of the audio depending on signal strength, or something like
Worcester's AM circuit which made the IF passband narrower as the signal
strength decreased.

Good speaker!

I agree with everything here, except I would make the IF selection
manual. Most purists want to be in control of their machine and will
likely open the box and manually modify it....if buy it at all.

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

Good crystal or mechanical filters too, not crappy ceramic thingies, as
they are certainly not flat in their passband and would require manual
audio EQ to compensate for the midrange hump.

Oh and please, as a former serviceman, paste the schematic on the inside
of the box like the old days :-)

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

Forgot to add: analog - dial's and knobs (perhaps double with a vacuum
flourescent display, but no LED's). Push-button-digital is for teens.
Serious audiophool's use dials and knobs ;-)

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

Gregg wrote in message
. ..
Behold, Radioman390 signaled from keyed 4-1000A filament:

I would prefer a table radio like a Tivoli or old KLH21


Ceratinly some DRM capability, or a place to add a plug-in card which
could be either DRM, C-QUAM stereo, or the digital AM (IBOC or Kahn?).

Depending on how the digital standard goes, at least the RF could be
constant.

10/9 khz tuning (US vs Euro)

Noise blanker

An input for a loop antenna

An input with DC phantom power for an outdoor active antenna

Maybe an antenna switch to switch between lop and other antenna, or two
loops.

Good tone controls

Perhaps something like the old Scott DYNAURAL circuit which shaped the
flatness of the audio depending on signal strength, or something like
Worcester's AM circuit which made the IF passband narrower as the signal
strength decreased.

Good speaker!

I agree with everything here, except I would make the IF selection
manual. Most purists want to be in control of their machine and will
likely open the box and manually modify it....if buy it at all.

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

Good crystal or mechanical filters too, not crappy ceramic thingies, as
they are certainly not flat in their passband and would require manual
audio EQ to compensate for the midrange hump.

Actually, if you terminate those ceramic types properly, the passband ripple
is less than 1.5dB.

Oh and please, as a former serviceman, paste the schematic on the inside
of the box like the old days :-)

I do plan on making schematics available..............the one thing that
perturbs me these days is the high price that one must pay for circuit
information. Oh, did I tell everybody that there will be no tuning
adjustments required. We may even warp the 2nd LO through software.


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

"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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