Receive Problems
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I've got a Rev A K2 (#529) that a friend brought to me to upgrade to all the
Rev B mods ect. Before I did the mods I fixed some problems....low audio out (bad solder joint) and other minor probs. So before I started the upgrades it was working. Here's the problem now. The radio works great except for the following on receive: Very low recovered audio and low S meter reading................ I'm looking in the preamp/mixer and receive VFO area....I found on the VFO (Q18) the original owner put another 1N4148 on the bottom of the board across D13 in the opposite polarity....was this something I didn't hear about (with or without I still have the problem). I've checked the voltages on the VFO and Buffer and the preamp and everything looks good. So does anyone have some ideas. Thanks in advance. Gregg R. Lengling, W9DHI, Retired Administrator http://www.milwaukeehdtv.org K2/100 S#3075 KX1 S# 57 Member: ARRL, RSGB, RCA, WERA and ORC _______________________________________________ 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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Gregg Lengling wrote:
>I've got a Rev A K2 (#529) that a friend brought to me to upgrade to all the >Rev B mods ect. Before I did the mods I fixed some problems....low audio >out (bad solder joint) and other minor probs. So before I started the >upgrades it was working. > >Here's the problem now. The radio works great except for the following on receive: >Very low recovered audio and low S meter reading................ > I'm looking in the preamp/mixer and receive VFO area....I found on >the VFO (Q18) the original owner put another 1N4148 on the bottom of the >board across D13 in the opposite polarity....was this something I didn't >hear about (with or without I still have the problem). I've checked the >voltages on the VFO and Buffer and the preamp and everything looks good. So >does anyone have some ideas. > > Hi Gregg: I'd take a close look around the post-mixer amp (Q22).... looking at R82, RFC11, in particular. 73 & GL Ken Wagner K3IU _______________________________________________ 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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In reply to this post by Gregg Lengling
Gregg,
I would suggest looking carefully in the IF filter area. You found one bad solder joint, so another one is quite likely. The last one I worked on with similar problems had a bad solder joint on the SSB board at one of the 3 pin headers - which reduced the signal getting to the IF amplifier a LOT. Remove the SSB board and put jumpers into the 3 pin headers (jumper from pins 1 to 3) and see if it comes to life again - if so, the problem is on the SSB board. 73, Don W3FPR ----- Original Message ----- I've got a Rev A K2 (#529) that a friend brought to me to upgrade to all the Rev B mods ect. Before I did the mods I fixed some problems....low audio out (bad solder joint) and other minor probs. So before I started the upgrades it was working. Here's the problem now. The radio works great except for the following on receive: Very low recovered audio and low S meter reading................ I'm looking in the preamp/mixer and receive VFO area....I found on the VFO (Q18) the original owner put another 1N4148 on the bottom of the board across D13 in the opposite polarity....was this something I didn't hear about (with or without I still have the problem). I've checked the voltages on the VFO and Buffer and the preamp and everything looks good. So does anyone have some ideas. _______________________________________________ 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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I had a small solder short on this plugg on the mainbord near the filter
area that gave this symptoms. I had to magnify to se it. Could not see it with eyes only. Tom LA1PHA ----- Original Message ----- From: "Don Wilhelm" <[hidden email]> To: "Gregg Lengling" <[hidden email]>; "Elecraft reflector" <[hidden email]> Sent: Thursday, July 29, 2004 2:49 AM Subject: Re: [Elecraft] Receive Problems > Gregg, > > I would suggest looking carefully in the IF filter area. You found one bad > solder joint, so another one is quite likely. The last one I worked on with > similar problems had a bad solder joint on the SSB board at one of the 3 pin > headers - which reduced the signal getting to the IF amplifier a LOT. > Remove the SSB board and put jumpers into the 3 pin headers (jumper from > pins 1 to 3) and see if it comes to life again - if so, the problem is on > the SSB board. > > 73, > Don W3FPR > > ----- Original Message ----- > > I've got a Rev A K2 (#529) that a friend brought to me to upgrade to all > Rev B mods ect. Before I did the mods I fixed some problems....low audio > out (bad solder joint) and other minor probs. So before I started the > upgrades it was working. > > Here's the problem now. The radio works great except for the following on > receive: > Very low recovered audio and low S meter reading................ > I'm looking in the preamp/mixer and receive VFO area....I found on > the VFO (Q18) the original owner put another 1N4148 on the bottom of the > board across D13 in the opposite polarity....was this something I didn't > hear about (with or without I still have the problem). I've checked the > voltages on the VFO and Buffer and the preamp and everything looks good. > does anyone have some ideas. > > > > _______________________________________________ > 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 > > _______________________________________________ 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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