Aux AF Jack

[Jim Giercyk]

Hello all,

I accidentally plugged my internal battery into the AUX AF jack instead of the AUX +12 jack.  You can imagine what happened.  I fried the firmware, which was okay because it needed to be replaced anyway.  Now that the new firmware is in, the receiver is deaf.  I traced that problem to U11 on the RF Board (Detector).  There is no signal going to the BFO, and pin 6 is 'microphonic'.  The signal from the IF Amp/Filter seems to be fine, and all of the DC voltages on the pins of the NE602 are to spec. 

I do not have much experience repairing my K2.  Are there any 'gotchas' I should know about with regard to the detector/bfo interface?  I only want to take the thing apart once if I can help it.....they don't call me sparky for nothin'.

Thanks,

Jim

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[Bill Johnson-9]

You could always send it in and have Elecraft repair it to avoid further “sparking” J

 

 

73,

 

Bill

K9YEQ

 

From: [hidden email] [mailto:[hidden email]] On Behalf Of Jim Giercyk
Sent: Monday, February 09, 2009 10:43 AM
To: [hidden email]
Subject: [Elecraft] Aux AF Jack

 

Hello all,

I accidentally plugged my internal battery into the AUX AF jack instead of the AUX +12 jack.  You can imagine what happened.  I fried the firmware, which was okay because it needed to be replaced anyway.  Now that the new firmware is in, the receiver is deaf.  I traced that problem to U11 on the RF Board (Detector).  There is no signal going to the BFO, and pin 6 is 'microphonic'.  The signal from the IF Amp/Filter seems to be fine, and all of the DC voltages on the pins of the NE602 are to spec. 

I do not have much experience repairing my K2.  Are there any 'gotchas' I should know about with regard to the detector/bfo interface?  I only want to take the thing apart once if I can help it.....they don't call me sparky for nothin'.

Thanks,

Jim

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[Jim Giercyk]

Indeed, but since I did build it I think it's only fitting that I personally spark it :)   I hadn't had the cover off the K2 in years, so I forgot where the plugs go.  I am planning on adding the KPA100 soon, so that solve that problem.  Thanks,

Jim

--- [hidden email] wrote:

From: "Bill Johnson" <[hidden email]>
To: <[hidden email]>, <[hidden email]>
Subject: RE: [Elecraft] Aux AF Jack
Date: Mon, 9 Feb 2009 10:50:29 -0600

You could always send it in and have Elecraft repair it to avoid further “sparking” J

 

 

73,

 

Bill

K9YEQ

 

From: [hidden email] [mailto:[hidden email]] On Behalf Of Jim Giercyk
Sent: Monday, February 09, 2009 10:43 AM
To: [hidden email]
Subject: [Elecraft] Aux AF Jack

 

Hello all,

I accidentally plugged my internal battery into the AUX AF jack instead of the AUX +12 jack.  You can imagine what happened.  I fried the firmware, which was okay because it needed to be replaced anyway.  Now that the new firmware is in, the receiver is deaf.  I traced that problem to U11 on the RF Board (Detector).  There is no signal going to the BFO, and pin 6 is 'microphonic'.  The signal from the IF Amp/Filter seems to be fine, and all of the DC voltages on the pins of the NE602 are to spec. 

I do not have much experience repairing my K2.  Are there any 'gotchas' I should know about with regard to the detector/bfo interface?  I only want to take the thing apart once if I can help it.....they don't call me sparky for nothin'.

Thanks,

Jim

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[Ken Alexander-2]

I'm working on Part V of the alignment "RF Power Amplifier Quiescent Current Adjustment", which calls for R39 to be adjusted for a reading of 20 mV.  The most I can get out of it is 18.5 mV.  Is that close enough?

Part VI - Filter Alignment:  When keying the transmitter and adjusting L12 to L17 the readings on my DMM are all over the map; they usually fall from an initial reading and settle down after 10 seconds or so.  Then they swing around a fair bit such that only gross movements of the slugs are visible.  Unkey the transmitter, move the diddle stick to the next slug and rekey the transmitter and you're starting with a whole new set of numbers.  Again, fine adjustments of the slug are masked by the constant variation of the voltage.  Any ideas?

Once again, any thoughts would be greatly appreciated.

73,

Ken Alexander, VE3HLS

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