My employer has given me the go ahead to design a new product. If there is
enough interest, I will design a new MW receiver for the market. What would
you be more interested in......................a small table top type, or a
portable?
Performance wise, I am talking about something like that of an AOR7030.
I don't think that I would be inplementing Sync Detection, but a couple of
I.F. bandwidths could be possible. Definitely, double conversion, and
digital readout, with good audio quality.
Would you want any presets? How about target price? Do you want a built in
antenna, or external antenna only? High and low impedance antenna inputs?
How about a built in tunable preselector?
E-mail me directly, and we will see what happens. Any of you who have built
any of me receivers know what I am talking about...............I plan to
take the design to the next couple of steps up in performance.

Pete

13123213213test

----------

Must have synch detection and selectable sideband. No serious MW
program listening is possible without it - the adjacent channel
shares spectrum with one sideband of the channel you're tuned to.

SSB upper and lower, and enough stability to hold the right
frequency for hours.

DSB reception (3dB better than SSB) with suppressed carrier notch,
to kill off slow carrier beats against multiple stations. The R8B
in SSB mode does this but gets only half the S/N that DSB would give.

(SSB and DSB for when there's more than one carrier present - the
pumping of the net carrier anti-pumps the detected audio, making it
unlistenable. Notching out the carrier(s) and just supplying
an internal stable one solves the pumping problem. The sidebands
do not pump by themselves, just the former reference carrier.)

Serious brick wall passband, to kill off an adjacent channel local
modulating the AGC on you.

Huge dynamic range; MW locals require it if you're going to suppress
them.

Audio notch filters against various hets from computer terminals
that the neighbors have.
--
Ron Hardin


On the internet, nobody knows you're a jerk.

Hi Ron,
This is supposed to be a budget unit..............I can design
all of those things into the unit, but it probably wouldn't be too cheap!
Ron Hardin wrote in message
...
Must have synch detection and selectable sideband. No serious MW
program listening is possible without it - the adjacent channel
shares spectrum with one sideband of the channel you're tuned to.

SSB upper and lower, and enough stability to hold the right
frequency for hours.
I believe that we are talking about a 50 dollar TCXO here.

DSB reception (3dB better than SSB) with suppressed carrier notch,
to kill off slow carrier beats against multiple stations. The R8B
in SSB mode does this but gets only half the S/N that DSB would give.

(SSB and DSB for when there's more than one carrier present - the
pumping of the net carrier anti-pumps the detected audio, making it
unlistenable. Notching out the carrier(s) and just supplying
an internal stable one solves the pumping problem. The sidebands
do not pump by themselves, just the former reference carrier.)

Serious brick wall passband, to kill off an adjacent channel local
modulating the AGC on you.

We've already got that.

Huge dynamic range; MW locals require it if you're going to suppress
them.

I am shooting for 5 volts of RF, before overload sets in. This way, very
long wires can be used. My present design already has better dynamic range
than my Drake R7.

Audio notch filters against various hets from computer terminals
that the neighbors have.
--
Ron Hardin


Thanks for the input, Ron!

Pete

On the internet, nobody knows you're a jerk.

Ron Hardin wrote:

Must have synch detection and selectable sideband. No serious MW
program listening is possible without it - the adjacent channel
shares spectrum with one sideband of the channel you're tuned to.

I agree. Sync' detection is the one feature missing from all current AM
(MW) receivers for the masses. I would prefer it to be a portable. I
guess the sync' feature would mean a price of at least $100. I wonder if
the Sony sync' (AM-stereo) chip would be available for your project, now
that the '2010' is out of production? Otherwise you would have to use
general purpose IC's for the sync' circuit. That's what Drake did. Good
luck with it.


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Hi Pete:

- Just my choices...

Portable over Small table top;
Double conversion would be a must.
Presets would be invaluable; I have them on the Sangean 606A and the Sangean
DT110
Built in antenna with external port.
DX - Local switch.. ?? always have it on DX..
OR

Tunable pre selector that wou't confuse the average shopper..

( focus group used here ?? ; talk to marketing)

Loop antenna add-ons for DX'ing or distant stations.
extra speaker plug ins for Stereo FM ??
Definitly Digital readout
Small, ( 3 inch?) ported speaker
Knob type Tone controls

Target price.. Dunno, competitive with others in the field..


In article , "Pete
KE9OA" writes:


My employer has given me the go ahead to design a new product. If there is
enough interest, I will design a new MW receiver for the market. What would
you be more interested in......................a small table top type, or a
portable?
Performance wise, I am talking about something like that of an AOR7030.
I don't think that I would be inplementing Sync Detection, but a couple of
I.F. bandwidths could be possible. Definitely, double conversion, and
digital readout, with good audio quality.
Would you want any presets? How about target price? Do you want a built in
antenna, or external antenna only? High and low impedance antenna inputs?
How about a built in tunable preselector?
E-mail me directly, and we will see what happens. Any of you who have built
any of me receivers know what I am talking about...............I plan to
take the design to the next couple of steps up in performance.

Pete

You do have some good ideas, and I am listening. A DX switch won't be
necessary; we will have a great dynamic range. The tunable preselector seems
to be a good thing. I will be pricing Type 61 ferrite rod stock tomorrow.
We were even talking about having some sort of band scanning spectrum
display, but right now, that is in the air. I will be bringing in one of my
own units tomorrow, and we will launch off from there.

Pete

Diverd4777 wrote in message
...

Hi Pete:

- Just my choices...

Portable over Small table top;
Double conversion would be a must.
Presets would be invaluable; I have them on the Sangean 606A and the
Sangean
DT110
Built in antenna with external port.
DX - Local switch.. ?? always have it on DX..
OR

Tunable pre selector that wou't confuse the average shopper..

( focus group used here ?? ; talk to marketing)

Loop antenna add-ons for DX'ing or distant stations.
extra speaker plug ins for Stereo FM ??
Definitly Digital readout
Small, ( 3 inch?) ported speaker
Knob type Tone controls

Target price.. Dunno, competitive with others in the field..


In article ,
"Pete
KE9OA" writes:


My employer has given me the go ahead to design a new product. If there
is
enough interest, I will design a new MW receiver for the market. What
would
you be more interested in......................a small table top type, or
a
portable?
Performance wise, I am talking about something like that of an AOR7030.
I don't think that I would be inplementing Sync Detection, but a couple
of
I.F. bandwidths could be possible. Definitely, double conversion, and
digital readout, with good audio quality.
Would you want any presets? How about target price? Do you want a built
in
antenna, or external antenna only? High and low impedance antenna
inputs?
How about a built in tunable preselector?
E-mail me directly, and we will see what happens. Any of you who have
built
any of me receivers know what I am talking about...............I plan to
take the design to the next couple of steps up in performance.

Pete

Behold, Pete KE9OA signaled from keyed 4-1000A filament:

You do have some good ideas, and I am listening. A DX switch won't be
necessary; we will have a great dynamic range.

Am I to assume then that you plan a double-balanced diode ring mixer?

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

Hi Gregg,
That is exactly what I plan to use..............I have been
using that topology for several years now, so I've got the Diplexer design
nailed down pretty well. Take a look at my website, and you can see how
I've got this implemented. I've got a few downloadable zip files of some of
my designs (no, I won't hide the schematic from the final product).
I am not sure why more manufacturers don't use doubly-balanced mixers,
especially when you can purchase a Mini-Circuits ADE-3 mixer for around 3
dollars. We are talking about a mixer with an SSB conversion loss of around
4.7dB, which, since this is a passive topology, translates approximately to
a noise figure of around 5dB. Since this is a Level 7 mixer, the IP3 should
be around +14dBm. Compare this to an Analog Devices AD831 mixer, which has a
+20dBm IP3, but has a 12dB NF. To reduce the NF to that of the ADE-3, you
need to have an RF amplifier ahead of that mixer. Let's say that we need
10dB of takeover gain from the RF amplifier; we now have an IP3 of only
+10dBm from that AD831, and we still need all of those external support
components for that mixer.

Pete

Gregg wrote in message
t...
Behold, Pete KE9OA signaled from keyed 4-1000A filament:

You do have some good ideas, and I am listening. A DX switch won't be
necessary; we will have a great dynamic range.

Am I to assume then that you plan a double-balanced diode ring mixer?

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

Behold, Pete KE9OA signaled from keyed 4-1000A filament:

Hi Gregg,
That is exactly what I plan to use..............I have
been
using that topology for several years now, so I've got the Diplexer
design nailed down pretty well.

You sir, are a god! Do you know how many people that are so-called
"engineering professionals" that do not know how to diplex the output of a
diode DBM?

I'm sold, when can I buy it ;-)


I am not sure why more manufacturers don't use doubly-balanced mixers,
especially when you can purchase a Mini-Circuits ADE-3 mixer for around
3 dollars.

Because they can pay 15 cents for a 2SCxxxx.

It all comes down to money. Nothing is about quality, just mark-up and
useless features.

You seem to be doing something that hasn't been done since the late 1950's
- engineering a soul into the unit :-)

You have my highest respect.

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