David Frackelton Gleason, still posing as the fraudulent 'Eduardo', wrote:

"SFTV_troy" wrote in message
oups.com...
On Oct 13, 2:50 pm, Telamon
wrote:

Ok, here is a difference you should understand. DRM uses two separate
transmitters and antennas one digital and one analog. HD uses two
different exciters one digital and the other analog that input into the
same transmitter and antenna at the same time.



Why does DRM have to use two separate antennas? Why can't DRM use a
combiner and output both signals through a single antenna?

Because the carrier frequencies are different... and because there is no
analog component to DRM... to do analog requires a separate station,
license, frequency.

License? Apparently you didn't need one for amateur radio in Ecuador, Edweenie!

In article .com,
SFTV_troy wrote:

On Oct 13, 2:50 pm, Telamon
wrote:

Ok, here is a difference you should understand. DRM uses two separate
transmitters and antennas one digital and one analog. HD uses two
different exciters one digital and the other analog that input into the
same transmitter and antenna at the same time.



Why does DRM have to use two separate antennas? Why can't DRM use a
combiner and output both signals through a single antenna?

Because it's different. Try to process that.

--
Telamon
Ventura, California

Frank Dresser wrote:

IBOC was engineered from the get-go with compatible recievers in mind.
The receivers would autoswitch from the analog to the digital signal.
Was DRM engineered with such autoswitching receivers in mind?

Obviously a DRM receiver can handle both analogue and
digital signals.
Once a DRM signal is received, all parallel frequencies of
the service are automatically stored in the receiver's memory.
If the signal becomes weak the receiver will automatically switch
to a better signal (if available), even in other bands.
With a small amount of digital information added to an existing
analogue AM broadcast (AMSS, AM Signalling System) the
receiver recognizes the alternative frequency information and
schedules for other DRM, DAB, AM and FM transmissions
carrying the same or related programme material.
When you tune in to an analoque AM transmission on 630 kHz
in the medium wave band the receiver could let you listening to
for instance a DRM broadcast on 9740 kHz on short wave.

Are any such autoswitching receivers currently available?

Himalaya DRM2009
http://www.himalaya.com.hk/index.php... d=28&lang=en

Morphy Richards DRM Radio
http://www.morphyrichards.co.uk/inde...SR03&ORLID=ENG

Both receivers are equipped with the modern RadioScape
RS500 module.

gr, Hein

"Hein ten Horn" wrote in message
...
Frank Dresser wrote:

IBOC was engineered from the get-go with compatible recievers in mind.
The receivers would autoswitch from the analog to the digital signal.
Was DRM engineered with such autoswitching receivers in mind?

Obviously a DRM receiver can handle both analogue and
digital signals.
Once a DRM signal is received, all parallel frequencies of
the service are automatically stored in the receiver's memory.
If the signal becomes weak the receiver will automatically switch
to a better signal (if available), even in other bands.
With a small amount of digital information added to an existing
analogue AM broadcast (AMSS, AM Signalling System) the
receiver recognizes the alternative frequency information and
schedules for other DRM, DAB, AM and FM transmissions
carrying the same or related programme material.
When you tune in to an analoque AM transmission on 630 kHz
in the medium wave band the receiver could let you listening to
for instance a DRM broadcast on 9740 kHz on short wave.


That's interesting, and I can imagine that approach working well. There
would be no need for the adjacent channel digital interference which is
designed into IBOC.

So it looks like DRM can be better than IBOC.



Are any such autoswitching receivers currently available?

Himalaya DRM2009

http://www.himalaya.com.hk/index.php... d=28&lang=en

Morphy Richards DRM Radio

http://www.morphyrichards.co.uk/inde...SR03&ORLID=ENG

Both receivers are equipped with the modern RadioScape
RS500 module.

gr, Hein


Thanks for the info!

Frank Dresser

On Oct 13, 12:13 pm, SFTV_troy wrote:
RHF wrote:
On Oct 12, 8:52 am, SFTV_troy wrote:
RHF wrote:
On Oct 11, 5:48 am, SFTV_troy

- There's no real difference between DRM's version
- (sitting next-to the AM signal) and HD's version
- (also sitting next-to the AM signal).

IBOC AM/MW "HD" Radio - Hybrid Mode
http://www.dallas.net/~jvpoll/rfi/AM...BOC_Mask10.gif
- Lower Digital Sidebands {Co-SideBand}
* Analog Host Signal (Mono) {Nested}
+ Upper Digital Sidebands {Co-SideBand}

- Thanks for proving my point. HD sits *next to* the AM signal (+/-

- 10 kHz). Same as DRM sits *next to* the AM signal (+/- 10 kHz).

DRM = Simulcast without Specification {Sans-Mask}
x x x Does Not Equal x x x
IBOC = Intrinsic {Mask} : Nested Analog + Two Digital Co-Sidebands

I still don't see the difference. Both standards are using sidebands,
adjacent to the analog AM signal.- Hide quoted text -

- Show quoted text -

Hey - you homo butt-****er! You disgust me, gay boy!

On Oct 18, 7:52 am, IBOCcrock wrote:
On Oct 13, 12:13 pm, SFTV_troy wrote:





RHF wrote:
On Oct 12, 8:52 am, SFTV_troy wrote:
RHF wrote:
On Oct 11, 5:48 am, SFTV_troy

- There's no real difference between DRM's version
- (sitting next-to the AM signal) and HD's version
- (also sitting next-to the AM signal).

IBOC AM/MW "HD" Radio - Hybrid Mode
http://www.dallas.net/~jvpoll/rfi/AM...BOC_Mask10.gif
- Lower Digital Sidebands {Co-SideBand}
* Analog Host Signal (Mono) {Nested}
+ Upper Digital Sidebands {Co-SideBand}

- Thanks for proving my point. HD sits *next to* the AM signal (+/-

- 10 kHz). Same as DRM sits *next to* the AM signal (+/- 10 kHz).

DRM = Simulcast without Specification {Sans-Mask}
x x x Does Not Equal x x x
IBOC = Intrinsic {Mask} : Nested Analog + Two Digital Co-Sidebands


- - I still don't see the difference.
- - Both standards are using sidebands,
- - adjacent to the analog AM signal.

- Hey - you homo butt-****er!
- You disgust me, gay boy!

IBOC Crock,

You sure do read a lot of weirdness
into other people's on-topic posts.

please do not post your 'closet' sexual fantasies
to this shortwave radio listener's newsgroup ~ RHF