re: Improvements for the KX1

[Joseph Trombino, Jr]

I'd really like to see another xtal or two added to the KX1 I.F. filter....3
poles just doesn't get it...the 4 pole filter in the K1 and 5 pole filter in
the K2 are noticeably better than the 3 pole filter in the KX1.

                                73, Joe W2KJ


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[Don Wilhelm-3]

Joe,

If you can figure out how to put them inside that already crowded
enclosure (and still maintain it as a kit), then yes a 4 or 5 pole
filter would be nice - BUT ...

73,
Don W3FPR

Joseph Trombino Jr wrote:
> I'd really like to see another xtal or two added to the KX1 I.F.
> filter....3 poles just doesn't get it...the 4 pole filter in the K1 and
> 5 pole filter in the K2 are noticeably better than the 3 pole filter in
> the KX1.
>
>                                73, Joe W2KJ
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[Ian Stirling, G4ICV, AB2GR]

On Saturday 05 May 2007 20:44:39 Joseph Trombino Jr wrote:
> I'd really like to see another xtal or two added to the KX1 I.F. filter....3
> poles just doesn't get it...the 4 pole filter in the K1 and 5 pole filter in
> the K2 are noticeably better than the 3 pole filter in the KX1.

  The K2 has seven crystals in the IF filter.
There are five before the IF amplifier and
two more before the product detector.

Ian, G4ICV, AB2GR, K2 #4962
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[Joseph Trombino, Jr]

----- Original Message -----
From: "Ian Stirling" <[hidden email]>
To: <[hidden email]>
Sent: Saturday, May 05, 2007 10:13 PM
Subject: Re: [Elecraft] re: Improvements for the KX1

> On Saturday 05 May 2007 20:44:39 Joseph Trombino Jr wrote:
>> I'd really like to see another xtal or two added to the KX1 I.F.
>> filter....3
>> poles just doesn't get it...the 4 pole filter in the K1 and 5 pole filter
>> in
>> the K2 are noticeably better than the 3 pole filter in the KX1.
>
>  The K2 has seven crystals in the IF filter.
> There are five before the IF amplifier and
> two more before the product detector.
>
> Ian, G4ICV, AB2GR, K2 #4962

Correct Ian....I didn't count the last two xtals since I believe these two
xtals are used more for removing I.F. noise than for providing
selectivity....at least this is what has been mentioned in other receiver
articles I have read.

                                        73, Joe W2KJ


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[Ian Stirling, G4ICV, AB2GR]

On Saturday 05 May 2007 22:24:11 Joseph Trombino Jr wrote:

> Correct Ian....I didn't count the last two xtals since I believe these two
> xtals are used more for removing I.F. noise than for providing
> selectivity....at least this is what has been mentioned in other receiver
> articles I have read.

Joe,

  The bandwidth of the two is affected by the same filter
bandwidth controlling voltage, V XFIL2, on an MV209 diode.
I wonder how it varies with the bandwidth of the five using
1SV149 diodes.
  I see also that there is a mysterious (to me, I don't see
where it goes) IF out via C181 that is indeed after only the
first five crystals.

73
Ian, G4ICV, AB2GR, K2 #4962
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[Dan Barker]

Adobe is your friend.

I did a search for c181, and found the I.F.OUT you mention.

Searching for I.F.OUT, I find it goes through J6/P6 to the Control board,
and then to the AGC mixer(NE602).

Dan / WG4S / K2 #2456

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Ian Stirling
Sent: Saturday, May 05, 2007 11:01 PM
To: [hidden email]
Subject: Re: [Elecraft] re: Improvements for the KX1


On Saturday 05 May 2007 22:24:11 Joseph Trombino Jr wrote:

> Correct Ian....I didn't count the last two xtals since I believe these two
> xtals are used more for removing I.F. noise than for providing
> selectivity....at least this is what has been mentioned in other receiver
> articles I have read.

Joe,

  The bandwidth of the two is affected by the same filter
bandwidth controlling voltage, V XFIL2, on an MV209 diode.
I wonder how it varies with the bandwidth of the five using
1SV149 diodes.
  I see also that there is a mysterious (to me, I don't see
where it goes) IF out via C181 that is indeed after only the
first five crystals.

73
Ian, G4ICV, AB2GR, K2 #4962
--
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[Dan Barker]

A lot of PDFs are available that are not searchable. ALL the Elecraft PDFs
(and any I produce too) are searchable. It's the only sane way to do it, but
it's certainly not the only way<g>.

Dan / WG4S / K2 #2456

-----Original Message-----
From: Ian Stirling [mailto:[hidden email]]
Sent: Monday, May 07, 2007 4:43 PM
To: Dan Barker
Subject: Re: [Elecraft] re: Improvements for the KX1


On Sunday 06 May 2007 08:44:33 you wrote:
> Adobe is your friend.
>
> I did a search for c181, and found the I.F.OUT you mention.
>
> Searching for I.F.OUT, I find it goes through J6/P6 to the Control board,
> and then to the AGC mixer(NE602).

 Thanks Dan - that's the first positive comment I've heard on
the distribution of documents as PDF files. Even though they
can be searched if they contain text and font information
rather than a graphic image of text, I have only ever looked
at a printed version if available.

73,
Ian, G4ICV, AB2GR, K2 #4962
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