Hi,

Let's say I pick up a regular HF shortwave station on AM.

Should I also be able to hear this same station on USB ?

If so, what would the freq. "offset" that I should increase the tuned freq.
to ?

Should I expect the USB freq to be clearer, or... ?

Thanks,
B.

"Robert11" wrote in message
...
Hi,

Let's say I pick up a regular HF shortwave station on AM.

Should I also be able to hear this same station on USB ?


Yes, and also on LSB.


If so, what would the freq. "offset" that I should increase the tuned
freq. to ?

No frequency offset. You should be able to zero beat the AM carrier at it's
exact frequency.


Should I expect the USB freq to be clearer, or... ?


That depends on the stability of your receiver, and the quality of the
product detector for the SSB signals. It will often be a bit muddier because
the filters used for true SSB are narrower than those used for AM, thus less
high frequency audio.

"Robert11" wrote in message
...
Hi,

Let's say I pick up a regular HF shortwave station on AM.

Should I also be able to hear this same station on USB ?

If so, what would the freq. "offset" that I should increase the tuned
freq.
to ?

Should I expect the USB freq to be clearer, or... ?

Thanks,
B.



yes you can listen to AM on USB by slope detecting
the frequency would be 1.5khz higher than the AM frequency
the audio might sound clearer as the IF filters on USB would normally
be narrower than when on AM

john wrote:

"Robert11" wrote in message
...
Hi,

Let's say I pick up a regular HF shortwave station on AM.

Should I also be able to hear this same station on USB ?

If so, what would the freq. "offset" that I should increase the tuned
freq.
to ?

Should I expect the USB freq to be clearer, or... ?

Thanks,
B.



yes you can listen to AM on USB by slope detecting
the frequency would be 1.5khz higher than the AM frequency
the audio might sound clearer as the IF filters on USB would normally
be narrower than when on AM

Should be able to zero beat right to the frequency. I think you are confusing
the use of 'slope detection' to copy an FM signal with an AM detector.

dxAce
Michigan
USA

"dxAce" wrote in message
...


john wrote:

"Robert11" wrote in message
...
Hi,

Let's say I pick up a regular HF shortwave station on AM.

Should I also be able to hear this same station on USB ?

If so, what would the freq. "offset" that I should increase the tuned
freq.
to ?

Should I expect the USB freq to be clearer, or... ?

Thanks,
B.



yes you can listen to AM on USB by slope detecting
the frequency would be 1.5khz higher than the AM frequency
the audio might sound clearer as the IF filters on USB would normally
be narrower than when on AM

Should be able to zero beat right to the frequency. I think you are
confusing
the use of 'slope detection' to copy an FM signal with an AM detector.

dxAce
Michigan
USA


True slope detection can be used on FM signals not SSB

It is really Single SideBand - Suppressed Carrier

For SSB the carrier which was suppressed when transmitted has to be
re-inserted (function of a BFO), modern receivers with USB and LSB mode
selection will insert the carrier automatically.

Then with careful tuning in the USB mode on modern receivers -- it should
sound very clear.

Also one can switch to LSB and get the same result

That is the intellegence is contained in BOTH the upper and lower sideband
of an AM signal.

Try this -- go to WWV at 10MHz with receiver set to AM, then switch to USB,
then LSB
With very careful tuning, the USB and LSB and AM signal will sound nearly
the same depending on filtering.

No offset is required if you tuned "dead on" to the AM signal

CL

On Thu, 10 Nov 2005 17:47:19 -0500, "Robert11"
wrote:

Hi,

Let's say I pick up a regular HF shortwave station on AM.

Should I also be able to hear this same station on USB ?

If so, what would the freq. "offset" that I should increase the tuned freq.
to ?

Should I expect the USB freq to be clearer, or... ?

Thanks,
B.


On some radios it works real well. On others, not so good. Unless
you have a true communications receiver the tuning steps are often too
crude to resove proper pitch. Makes music sound especially weird.
(Back to that non-linear active device again).

"Robert11" wrote in message
...
Hi,

Let's say I pick up a regular HF shortwave station on AM.

Should I also be able to hear this same station on USB ?

If so, what would the freq. "offset" that I should increase the tuned
freq. to ?

Should I expect the USB freq to be clearer, or... ?

Thanks,
B.

You can receive the AM signal on both USB and LSB. This is a good technique
to remember as listening to one sideband is not so prone to selective fading
or phase distortion of the carrier. It is also useful when trying to listen
to AM stations 5KHz apart. Often you can tune to one or other of the
sidebands and listen to a clear signal, while the other sideband is being
interefered with by the adjacent station.

The sideband filter usually has a narrower bandwidth. This is not a hi fi
method, but it is excellent for identifying weaker signals.

Some stations do transmit on SSB only. AFRS is on 10320khz from Hawaii in my
afternoons, with a very strong USB signal.

Brad.