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[N4MJG]

 Am i i understand that when use IF SHIFT cut the nosie i have play around to try difference way mainly cw beside usb or lsb i nenever try it before both FT897D and ft 847 please help meto understand i have do much  HF  that nuch and cw as try to learn the IF SHIFT.I  did read both owner manueal still don't understand yet.

73
Jackie
SKCC 7305 SINCE 2005
NAQCC 5233
General  LIC SINCE 2007
PRFER EQSL

[VE3NNM]

Passband tuning is a filter that allows you to reduce interference from stations operating very close to the frequency you're on.

If you move your passband tuning from one end to the other you'll notice that at one end the reception is high-pitched and tinny and at the other end the reception is low-pitched and squawky. You have probably noticed already that depending on whether an interfering signal is above or below the frequency you're operating on the interference is either high-pitched or low-pitched. You move your passband tuning away from the interference. So if you're getting low-pitched squawky interference you adjust your passband tuning towards the high-pitched side.

If you aren't getting any interference from a station transmitting close to the frequency you're on then you leave the setting somewhere around the middle at a tone that's comfortable to you.

Rather than having a wide/narrow passband filter in the I.F. stage of your receiver, a passband tuning control keeps the receiver's width the same but allows you to move it around a bit to favor the high end or low end. It moves the narrow range you're receiving without changing the frequency you're operating on.

[N4MJG]

VE3NNM

THhank you i understand it now ! i'm learning something new everyday !

73
Jackie
SKCC 7305 SINCE 2005
NAQCC 5233
OMISS 11548
General LIC SINCE 2007
PREFER EQSL

Passband tuning is a filter that allows you to reduce interference from stations operating very close to the frequency you're on.

If you move your passband tuning from one end to the other you'll notice that at one end the reception is high-pitched and tinny and at the other end the reception is low-pitched and squawky. You have probably noticed already that depending on whether an interfering signal is above or below the frequency you're operating on the interference is either high-pitched or low-pitched. You move your passband tuning away from the interference. So if you're getting low-pitched squawky interference you adjust your passband tuning towards the high-pitched side.

If you aren't getting any interference from a station transmitting close to the frequency you're on then you leave the setting somewhere around the middle at a tone that's comfortable to you.

Rather than having a wide/narrow passband filter in the I.F. stage of your receiver, a passband tuning control keeps the receiver's width the same but allows you to move it around a bit to favor the high end or low end. It moves the narrow range you're receiving without changing the frequency you're operating on.

[SWMAN]

 I think he was asking about the IF Shift knob.
But I guess that must control the Passband Tuning ? “

[VE3NNM]

Paassband Tuning and IF Shift perform the same basic function to the end user but at different points in the receiver chain. Some transceivers even have an "IF Shift / Passband Tuning" combined knob. Most of the economy transceivers that have a control for this use Passband Tuning rather than IF Shift.

The name of this sub-forum is "Elmers". It is the place where beginners go to get a basic explanation. IF Shift controls what the receiver passes therefore I used the term Passband Tuning to explain the concept.

IF Shift is considered to be superior to Passband Tuning, not that it matters to the person posing the question.

[SWMAN]

Ok, now I know, that’s sort of what I thought about the 2 but wasn’t exactly sure.
Thanks and 73.
Jim W5JJG

[AF5CC]

IF shift keeps the passband the same width, just moves the center of it around.  On many current radios passband tuning actually narrows the width of the passband, sometimes from one side or the other, sometimes from both side at the same time.  Kind of depends on the radio.  Kenwood used to call this slope tuning, and Yaesu used to call it the width control.

73 John AF5CC

[N4MJG]

OK  guys i rally understands this this is fun lol i been playing around mainly cw and play with ft 102 i learn how cut noise  down and bring the weak had play with it. making sence now thank you all for trying to understand this. as read it before but never understood them that explian how that work  ok i get it lol that waht ham radio is all about. i was too lazy to learn it !

73
Jackie
N4MJG
SKCC 7305 SINCE 2005
NAQCC 5233
OMISS 11548
General LIC SINCE 2007
PREFER EQSL

[SWMAN]

 Thanks guys from me also. 
Interesting for sure.