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[K3}AM Receive BW

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Joel R. Hallas

[K3}AM Receive BW

I have a question about AM receive bandwidth options. I don't see in the
manual a definition of the allowed DSP BW for each mode. I know that the 6
kHz xtal filter is suggested for AM, but wonder if the DSP bandwidth can go
wider, perhaps 10 kHz for BC and solid SWBC reception? If so, can the FM
roofing filter be switched in for WB AM use. Alternately, can a coupling
capacitor be used across the filter slots to just use DSP for AM BC?

Thanks!

Regards, Joel

Joel R. Hallas, W1ZR

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Greg - AB7R

Re: [K3}AM Receive BW

Joel,

I just updated this topic on the FAQ a couple days ago. Please take a look and let
me know if you have any additional questions. As far as doing a mod on the filter
slots, I don't think Elecraft at this time would endorse this, but Wayne or Eric
would have to comment on it.

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065
K3#0009

On Fri Oct 26 10:27 , "Joel R. Hallas" sent:

>I have a question about AM receive bandwidth options. I don't see in the
>manual a definition of the allowed DSP BW for each mode. I know that the 6
>kHz xtal filter is suggested for AM, but wonder if the DSP bandwidth can go
>wider, perhaps 10 kHz for BC and solid SWBC reception? If so, can the FM
>roofing filter be switched in for WB AM use. Alternately, can a coupling
>capacitor be used across the filter slots to just use DSP for AM BC?
>
>
>
>Thanks!
>
>
>
>Regards, Joel
>
>Joel R. Hallas, W1ZR
>
>
>
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KK7P

Re: [K3}AM Receive BW

In reply to this post by Joel R. Hallas

> ...Alternately, can a coupling
> capacitor be used across the filter slots to just use DSP for AM BC?

No, a roofing filter is required. Please see my remarks the other day
about IF image response.

73,

Lyle KK7P

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Eric Swartz - WA6HHQ

Re: [K3}AM Receive BW

Administrator

Lyle - I think it definitely is desirable to let then RX with the wider
FM filter in AM. (With relaxed image reject specs.) I do this on all my
other radios. In that case, what is the max DSP b/w?
e

Lyle Johnson wrote:

>> ...Alternately, can a coupling
>> capacitor be used across the filter slots to just use DSP for AM BC?
>
> No, a roofing filter is required. Please see my remarks the other day
> about IF image response.
>
> 73,
>
> Lyle KK7P
>
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wayne burdick

Re: [K3] AM Receive BW w/FM filter is OK

Administrator

This is already discussed in the FAQ. AM RX is OK with the FM filter.
You can also copy AM through an SSB filter in SSB mode; the K3 is
extremely frequency stable and opposite-sideband rejection very high.
You can optionally use the RX EQ menu entry to cut the bass frequencies
near the carrier, if desired, or use I.F. shift.

73,
Wayne
N6KR

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Bill Steffey NY9H

Re: Re: [K3] AM Receive BW w/FM filter is OK

too bad the FCC recently allowed the AM digital to run at nightime,
which makes adjacent channel listening rather difficult. With too
wide a receive bandwidth...will not the IBOC digital streams come
into the audio demodulation ????
( obviously I am talking about AM broadcast band... not SW )
bill

At 11:24 AM 10/26/2007, wayne burdick wrote:

>This is already discussed in the FAQ. AM RX is OK with the FM
>filter. You can also copy AM through an SSB filter in SSB mode; the
>K3 is extremely frequency stable and opposite-sideband rejection
>very high. You can optionally use the RX EQ menu entry to cut the
>bass frequencies near the carrier, if desired, or use I.F. shift.
>
>73,
>Wayne
>N6KR
>
>
>---
>
>http://www.elecraft.com
>
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