9KHz AM IF Bandwidth

[VK5ABQ]

Is this available yet please Elecraft?

[wayne burdick]

Hi Shane,

The AM bandwidth at the I.F. is limited to 10 kHz with an FM crystal
filter, and 6 kHz with the AM crystal filter. The bandwidth at the
audio output is a little less than half this.

If you're referring to VFO tuning rates in AM mode, yes, 9 kHz is one
of the step sizes available for AM mode in the CONFIG:VFO CRS (VFO
Coarse) menu entry.

73,
Wayne
N6KR


On May 12, 2008, at 5:07 PM, Shane White wrote:

>
> Is this available yet please Elecraft?
> --


---

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[VK5ABQ]

Thanks Wayne. I was referring to passband width, not tuning rate thanks.
I thought the FM filter couldn't be used when listening to AM mode? 10KHz may be a little wide though. Do you know how recent testing of wider AM IF bandwidths went please?

wayne burdick wrote

Hi Shane,

The AM bandwidth at the I.F. is limited to 10 kHz with an FM crystal
filter, and 6 kHz with the AM crystal filter. The bandwidth at the
audio output is a little less than half this.

If you're referring to VFO tuning rates in AM mode, yes, 9 kHz is one
of the step sizes available for AM mode in the CONFIG:VFO CRS (VFO
Coarse) menu entry.

73,
Wayne
N6KR


On May 12, 2008, at 5:07 PM, Shane White wrote:

>
> Is this available yet please Elecraft?
> --


---

http://www.elecraft.com

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[wayne burdick]

Shane White wrote:

> Thanks Wayne. I was referring the passband width, not tuning rate
> thanks.
> I thought the FM filter couldn't be used when listening to AM mode?
> 10KHz
> may be a little wide though. Do you know how recent testing of wider
> AM IF
> bandwidths went please?

Shane,

You can narrow the AM IF bandwidth down as much as you'd like. The NORM
value is 6 kHz, which translates to an audio bandwidth of 3 kHz.
Widening it above 6 kHz is only useful if you have the FM filter, which
you can indeed use for AM RX. (But not TX -- yet.)

73,
Wayne
N6KR

---

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[VK5ABQ]

So I could select the FM filter to provide a 10KHz IF bandwidth and then narrow that down to suit me?

wayne burdick wrote

Shane White wrote:

> Thanks Wayne. I was referring the passband width, not tuning rate
> thanks.
> I thought the FM filter couldn't be used when listening to AM mode?
> 10KHz
> may be a little wide though. Do you know how recent testing of wider
> AM IF
> bandwidths went please?

Shane,

You can narrow the AM IF bandwidth down as much as you'd like. The NORM
value is 6 kHz, which translates to an audio bandwidth of 3 kHz.
Widening it above 6 kHz is only useful if you have the FM filter, which
you can indeed use for AM RX. (But not TX -- yet.)

73,
Wayne
N6KR

---

http://www.elecraft.com

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[wayne burdick]

Shane White wrote:

> So I could select the FM filter to provide a 10KHz IF bandwidth and
> then
> narrow that down to suit me?

Yes. Be sure to enable all relevant crystal filters; they'll be
selected automatically as you rotate the WIDTH control. The 6 kHz
filter will give you the best combination of fidelity and
adjacent-channel rejection. You can go down to 2.8 or 2.7 kHz, if you
like, although that will severely constrain the audio bandwidth (to
about 1.4 kHz).

73,
Wayne

---

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[VK5ABQ]

Great. What's the approximate time between placing an order and receiving the radio at the moment please?

wayne burdick wrote

Shane White wrote:

> So I could select the FM filter to provide a 10KHz IF bandwidth and
> then
> narrow that down to suit me?

Yes. Be sure to enable all relevant crystal filters; they'll be
selected automatically as you rotate the WIDTH control. The 6 kHz
filter will give you the best combination of fidelity and
adjacent-channel rejection. You can go down to 2.8 or 2.7 kHz, if you
like, although that will severely constrain the audio bandwidth (to
about 1.4 kHz).

73,
Wayne

---

http://www.elecraft.com

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[wayne burdick]

Shane White wrote:

> Great. What's the approximate time between placing an order and
> receiving the
> radio at the moment please?

Last time I checked it was about 4 to 5 months. We're working on that!
But check with [hidden email] for a better estimate.

Meanwhile, you could get a better feel for the K3 by taking a look at
the owner's manual on our web site. Just click on the K3 photo, then go
to the bottom of the K3 page.

73,
Wayne
N6KR

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[VK5ABQ]

Thanks for your help Wayne.