KRX3 Mounting Problem

[Kenneth Lopez-2]

Howdy,

I have nearly completed the KRX 3 installation, but have run into a  
physical mounting problem

The two 1 1/2" 4-40 screws are not long enough to reach the stand  
offs below the KRX3 module

I have VERY carefully followed instructions.  There have been some  
missing standoffs which I had to supply from my own stock.  As a  
result I have been careful to measure all of the screws and standoffs.

It appears to me that many of the standoffs mounted on the RF board  
are too short.

The KRX 3 module rests on the battery,  and mates correctly with the  
pins on the mating boards.  It has what looks to be the right amount  
of clearance above the RF board toroids.

I took the side panel off to better see the clearances.  It looks as  
though the supplied screws are at least 1/2" too short.

What in heck is going on?  Have I done something wrong?

Or do I have the wrong screws supplied? Or the wrong standoffs?

Cheers,

Ken N6TZV
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[Johnny Siu]

Hi Ken,

You can just refer back to the inventory list in p.7-9 of your KRX3 assembly manual.  In the list, the dimensions of the hardwares are given.

In the past, a wrong size standoff was given to my KNB2.

Just check the inventory list first, if there are wrong parts, simply send elecraft an email and they will send you the replacement right the way.

cheers,

Johnny Siu VR2XMC
K3# 0046 and many K2s


--- 2008年12月29日 星期一，Kenneth Lopez <[hidden email]> 寫道﹕

> 寄件人: Kenneth Lopez <[hidden email]>
> 主題: [Elecraft] KRX3 Mounting Problem
> 收件人: [hidden email]
> 日期: 2008 12 29 星期一 下午 3:18
> Howdy,
>
> I have nearly completed the KRX 3 installation, but have
> run into a physical mounting problem
>
> The two 1 1/2" 4-40 screws are not long enough to
> reach the stand offs below the KRX3 module
>
> I have VERY carefully followed instructions.  There have
> been some missing standoffs which I had to supply from my
> own stock.  As a result I have been careful to measure all
> of the screws and standoffs.
>
> It appears to me that many of the standoffs mounted on the
> RF board are too short.
>
> The KRX 3 module rests on the battery,  and mates correctly
> with the pins on the mating boards.  It has what looks to be
> the right amount of clearance above the RF board toroids.
>
> I took the side panel off to better see the clearances.  It
> looks as though the supplied screws are at least 1/2"
> too short.
>
> What in heck is going on?  Have I done something wrong?
>
> Or do I have the wrong screws supplied? Or the wrong
> standoffs?
>
> Cheers,
>
> Ken N6TZV
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

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[Don Wilhelm-4]

Ken,

Measure the standoffs mounted on the main board - they should be 7/8
inch and must have two split lockwashers under them - a total height
above the board not quite an inch.  The height of these standoffs are
critical because the 1 1/2 inch screws only engage the threads for about
1/8 inch.

If those standoffs are correct, check all the standoffs that you mounted
in the KRX3 board and the number of lockwashers between the standoffs
and the board - these must be correct for everything to fit properly.

73,
Don W3FPR

Kenneth Lopez wrote:

> Howdy,
>
> I have nearly completed the KRX 3 installation, but have run into a
> physical mounting problem
>
> The two 1 1/2" 4-40 screws are not long enough to reach the stand offs
> below the KRX3 module
>
> I have VERY carefully followed instructions.  There have been some
> missing standoffs which I had to supply from my own stock.  As a
> result I have been careful to measure all of the screws and standoffs.
>
> It appears to me that many of the standoffs mounted on the RF board
> are too short.
>
> The KRX 3 module rests on the battery,  and mates correctly with the
> pins on the mating boards.  It has what looks to be the right amount
> of clearance above the RF board toroids.
>
> I took the side panel off to better see the clearances.  It looks as
> though the supplied screws are at least 1/2" too short.
>
> What in heck is going on?  Have I done something wrong?
>
> Or do I have the wrong screws supplied? Or the wrong standoffs?
>
> Cheers,
>
> Ken N6TZV
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
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>
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>
>  

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[W7TMT]

This issue is also impacted by how well the cover fits over the rcvr board.
I had to fiddle with mine a bit and file off some misplaced nubs on the
circuit board in order to get the top and bottom sheet metal parts to snap
together properly. If the top cover isn't positioned correctly it will hold
the screw head too high to mate with the stand-offs. The form, fit, and
finish of the rest of the radio is close to perfect but that wrap around
cover took a lot of extra care before I finally got mine to fit right.

73/Patrick
W7TMT
 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Don Wilhelm
> Sent: Monday, December 29, 2008 5:13 AM
> To: Kenneth Lopez
> Cc: [hidden email]
> Subject: Re: [Elecraft] KRX3 Mounting Problem
>
> Ken,
>
> Measure the standoffs mounted on the main board - they should
> be 7/8 inch and must have two split lockwashers under them -
> a total height above the board not quite an inch.  The height
> of these standoffs are critical because the 1 1/2 inch screws
> only engage the threads for about
> 1/8 inch.
>
> If those standoffs are correct, check all the standoffs that
> you mounted in the KRX3 board and the number of lockwashers
> between the standoffs and the board - these must be correct
> for everything to fit properly.
>
> 73,
> Don W3FPR
>

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