Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.
You mean this link for N0SS signal tracing on the K1? http://www.mmccs.com/mmarc/n0ss/k1_signal_tracing.pdf Mid-Missouri radio club continues to maintain most of Tom’s papers. 72, gene WG7GW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.
Helpful once again. I also use a Heatkit signal gen., I didn't mention.
It punches up well on my scope. I'll try it again.
The scans are what's already on the board, however. These have been useful
but limited. Maybe there is something out on the Net that identifies the
solder points/pads too.
Les
On Aug 22, 2014 12:23 PM, "Don Wilhelm" wrote:
> Les,
>
> 50 uV is not a large enough signal to see on a 'scope or RF probe. You
> really need 1.4 volts (or whatever is specified in the procedure) of RF
> input.
>
> I suggest you build the simple oscillator shown in the Signal Tracing
> appendix of the manual. It has good output for that purpose. The crystal
> should be at a frequency within your tuning range.
>
> 73,
> Don W3FPR
>
> On 8/22/2014 3:07 PM, Les Garwood wrote:
>
>> Thanks again, Don.
>> I've been using Elecraft's signal injector; you may know it puts out 50
>> micro volts on the high setting.
>> I'll try your suggestions but I think I did part of them already.
>> BTW, I'm using my Android phone so it's tough to write a lot of detail.
>>
>> Les
>> On Aug 22, 2014 11:05 AM, "Don Wilhelm" wrote:
>>
>> Les,
>>>
>>> You did not mention your test gear nor any information about your setup,
>>> so I have to make some guesses and ask some groundwork questions.
>>>
>>> Are you injecting RF from a signal generator to the BNC jack? If so, is
>>> that signal large enough to register on what you are using to determine
>>> signal or no signal ('scope with 10X probe or RF Probe)?
>>> Do you have the jumper installed in J2 of the band board?
>>>
>>> Turn the signal generator off, then on while observing the level at band
>>> board J8 pin 8 - you should see a rise in the RF being measured. If not,
>>> the signal level is too low to register on your measurement device.
>>>
>>> The Signal Tracing section starting on page 5 of the K1 manual appendix
>>> gives you an orderly sequence for troubleshooting. Where does the signal
>>> level drop below the expected level? That point is just past the point
>>> of
>>> failure.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>> On 8/22/2014 1:03 PM, Les Garwood wrote:
>>>
>>> Dear Fellows,
I just finished construction of my K1. The receiver stage worked
perfectly
until I finished the transmitter stage. I still get audio hiss and
volume
but no signal on any band, AGC on or off, attenuator on or off.
All the voltages and resistances check out except the anode of D9,
according to the manual, is supposed to be > 100k. I'm sure this is an
error, however, since the DC path to ground from that point goes
through
three resistors and a choke totalling only about a couple K, which is
what
I measure.
I still get rf out of the VFO, and can trace it through the filter
board,
J6, at pins 1,2 and 6, with my scope. However, there is no trace of
signal rf from the antenna on pins 1 or 8 of J7.
I have no rf at the attenuator relay either, at pin 3, or any other.
I can't quite figure out yet how the TR switch circuit works (or doesn't
perhaps) so it's hard to troubleshoot if it is the problem or not.
Needing the filter board in place makes trouble shooting all the harder
too. I wish I had a layout view showing the bottom of the rf board to
help.
As always, any comments welcome and appreciated.
__
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>>
>>
>
__
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Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.
Les,
50 uV is not a large enough signal to see on a 'scope or RF probe. You
really need 1.4 volts (or whatever is specified in the procedure) of RF
input.
I suggest you build the simple oscillator shown in the Signal Tracing
appendix of the manual. It has good output for that purpose. The
crystal should be at a frequency within your tuning range.
73,
Don W3FPR
On 8/22/2014 3:07 PM, Les Garwood wrote:
Thanks again, Don.
I've been using Elecraft's signal injector; you may know it puts out 50
micro volts on the high setting.
I'll try your suggestions but I think I did part of them already.
BTW, I'm using my Android phone so it's tough to write a lot of detail.
Les
On Aug 22, 2014 11:05 AM, "Don Wilhelm" wrote:
Les,
You did not mention your test gear nor any information about your setup,
so I have to make some guesses and ask some groundwork questions.
Are you injecting RF from a signal generator to the BNC jack? If so, is
that signal large enough to register on what you are using to determine
signal or no signal ('scope with 10X probe or RF Probe)?
Do you have the jumper installed in J2 of the band board?
Turn the signal generator off, then on while observing the level at band
board J8 pin 8 - you should see a rise in the RF being measured. If not,
the signal level is too low to register on your measurement device.
The Signal Tracing section starting on page 5 of the K1 manual appendix
gives you an orderly sequence for troubleshooting. Where does the signal
level drop below the expected level? That point is just past the point of
failure.
73,
Don W3FPR
On 8/22/2014 1:03 PM, Les Garwood wrote:
Dear Fellows,
I just finished construction of my K1. The receiver stage worked
perfectly
until I finished the transmitter stage. I still get audio hiss and volume
but no signal on any band, AGC on or off, attenuator on or off.
All the voltages and resistances check out except the anode of D9,
according to the manual, is supposed to be > 100k. I'm sure this is an
error, however, since the DC path to ground from that point goes through
three resistors and a choke totalling only about a couple K, which is
what
I measure.
I still get rf out of the VFO, and can trace it through the filter board,
J6, at pins 1,2 and 6, with my scope. However, there is no trace of
signal rf from the antenna on pins 1 or 8 of J7.
I have no rf at the attenuator relay either, at pin 3, or any other.
I can't quite figure out yet how the TR switch circuit works (or doesn't
perhaps) so it's hard to troubleshoot if it is the problem or not.
Needing the filter board in place makes trouble shooting all the harder
too. I wish I had a layout view showing the bottom of the rf board to
help.
As always, any comments welcome and appreciated.
__
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Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.
Hi, Yes, Tom had scans of all the legacy gear boards, both top and bottom. They were on the preserved website at http://www.mmccs.com/mmarc/n0ss/, but right now, it looks like the link refers back to the master page. I will try to contact their webmaster to see if that can be fixed. In the meantime, I do have copies of those board images, and will email them one at a time to anyone who requests them. 73, Don W3FPR On 8/22/2014 2:18 PM, Mike Morrow wrote: I wish I had a layout view showing the bottom of the rf board to help. I have wished (for 14 years) for such PCB trace layouts. They are very appropriate for *ALL* kits. For some reason that has never been coherently explained, Elecraft has never supplied them. Tom/N0SS (SK) published photos of the PCB for the K1 years ago, but I do not think those are available any more, even at the remnant of his web site that is preserved by his ham club. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.
Thanks again, Don.
I've been using Elecraft's signal injector; you may know it puts out 50
micro volts on the high setting.
I'll try your suggestions but I think I did part of them already.
BTW, I'm using my Android phone so it's tough to write a lot of detail.
Les
On Aug 22, 2014 11:05 AM, "Don Wilhelm" wrote:
> Les,
>
> You did not mention your test gear nor any information about your setup,
> so I have to make some guesses and ask some groundwork questions.
>
> Are you injecting RF from a signal generator to the BNC jack? If so, is
> that signal large enough to register on what you are using to determine
> signal or no signal ('scope with 10X probe or RF Probe)?
> Do you have the jumper installed in J2 of the band board?
>
> Turn the signal generator off, then on while observing the level at band
> board J8 pin 8 - you should see a rise in the RF being measured. If not,
> the signal level is too low to register on your measurement device.
>
> The Signal Tracing section starting on page 5 of the K1 manual appendix
> gives you an orderly sequence for troubleshooting. Where does the signal
> level drop below the expected level? That point is just past the point of
> failure.
>
> 73,
> Don W3FPR
>
> On 8/22/2014 1:03 PM, Les Garwood wrote:
>
>> Dear Fellows,
>>
>> I just finished construction of my K1. The receiver stage worked
>> perfectly
>> until I finished the transmitter stage. I still get audio hiss and volume
>> but no signal on any band, AGC on or off, attenuator on or off.
>> All the voltages and resistances check out except the anode of D9,
>> according to the manual, is supposed to be > 100k. I'm sure this is an
>> error, however, since the DC path to ground from that point goes through
>> three resistors and a choke totalling only about a couple K, which is
>> what
>> I measure.
>> I still get rf out of the VFO, and can trace it through the filter board,
>> J6, at pins 1,2 and 6, with my scope. However, there is no trace of
>> signal rf from the antenna on pins 1 or 8 of J7.
>>
>> I have no rf at the attenuator relay either, at pin 3, or any other.
>>
>> I can't quite figure out yet how the TR switch circuit works (or doesn't
>> perhaps) so it's hard to troubleshoot if it is the problem or not.
>>
>> Needing the filter board in place makes trouble shooting all the harder
>> too. I wish I had a layout view showing the bottom of the rf board to
>> help.
>>
>> As always, any comments welcome and appreciated.
>>
>>
>>
>
__
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Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.
Les wrote: >All the voltages and resistances check out except the anode of D9, >according to the manual, is supposed to be > 100k. I'm sure this is an >error, however, since the DC path to ground from that point goes through >three resistors and a choke totalling only about a couple K, which is what >I measure. The manual calls for this to be greater than *100* ohms, not *100,000* ohms. A kit sold for 14 years is unlikely to have incorrect test point standards. :-) >I wish I had a layout view showing the bottom of the rf board to help. I have wished (for 14 years) for such PCB trace layouts. They are very appropriate for *ALL* kits. For some reason that has never been coherently explained, Elecraft has never supplied them. Tom/N0SS (SK) published photos of the PCB for the K1 years ago, but I do not think those are available any more, even at the remnant of his web site that is preserved by his ham club. Mike / KK5F __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.
Les,
You did not mention your test gear nor any information about your setup,
so I have to make some guesses and ask some groundwork questions.
Are you injecting RF from a signal generator to the BNC jack? If so, is
that signal large enough to register on what you are using to determine
signal or no signal ('scope with 10X probe or RF Probe)?
Do you have the jumper installed in J2 of the band board?
Turn the signal generator off, then on while observing the level at band
board J8 pin 8 - you should see a rise in the RF being measured. If
not, the signal level is too low to register on your measurement device.
The Signal Tracing section starting on page 5 of the K1 manual appendix
gives you an orderly sequence for troubleshooting. Where does the
signal level drop below the expected level? That point is just past the
point of failure.
73,
Don W3FPR
On 8/22/2014 1:03 PM, Les Garwood wrote:
Dear Fellows,
I just finished construction of my K1. The receiver stage worked perfectly
until I finished the transmitter stage. I still get audio hiss and volume
but no signal on any band, AGC on or off, attenuator on or off.
All the voltages and resistances check out except the anode of D9,
according to the manual, is supposed to be > 100k. I'm sure this is an
error, however, since the DC path to ground from that point goes through
three resistors and a choke totalling only about a couple K, which is what
I measure.
I still get rf out of the VFO, and can trace it through the filter board,
J6, at pins 1,2 and 6, with my scope. However, there is no trace of
signal rf from the antenna on pins 1 or 8 of J7.
I have no rf at the attenuator relay either, at pin 3, or any other.
I can't quite figure out yet how the TR switch circuit works (or doesn't
perhaps) so it's hard to troubleshoot if it is the problem or not.
Needing the filter board in place makes trouble shooting all the harder
too. I wish I had a layout view showing the bottom of the rf board to help.
As always, any comments welcome and appreciated.
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
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[Elecraft] K1 Issue. Lost reception when transmitter stage completed.
Dear Fellows, I just finished construction of my K1. The receiver stage worked perfectly until I finished the transmitter stage. I still get audio hiss and volume but no signal on any band, AGC on or off, attenuator on or off. All the voltages and resistances check out except the anode of D9, according to the manual, is supposed to be > 100k. I'm sure this is an error, however, since the DC path to ground from that point goes through three resistors and a choke totalling only about a couple K, which is what I measure. I still get rf out of the VFO, and can trace it through the filter board, J6, at pins 1,2 and 6, with my scope. However, there is no trace of signal rf from the antenna on pins 1 or 8 of J7. I have no rf at the attenuator relay either, at pin 3, or any other. I can't quite figure out yet how the TR switch circuit works (or doesn't perhaps) so it's hard to troubleshoot if it is the problem or not. Needing the filter board in place makes trouble shooting all the harder too. I wish I had a layout view showing the bottom of the rf board to help. As always, any comments welcome and appreciated. 73 Les KE7SLX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
