On 9/4/07, Mychael Morohovich [EMAIL PROTECTED] wrote:
I would like to offer that I do include a note with my K2 sets
instructing the builder not to pull the leads too tightly while
installing K2-T2.
Hi Mychael.
I didn't mean to sound insulting or belittle your service in anyway.
However,
Hi, John-
Thank you for your post, as well as for the use of my service. In rereading
what I had written, I believe that my post might have come with a terseness
that I had not intended, so my apologies as well. K2-T2 is a little tricky
to get right, as is communicating with the written word it
During the initial TX alignment of my K2, I can't seem to get the
output power above 0.2W - it fluctuates between 0.1 and 0.2 and
doesn't change as I adjust L1 and L2. I am, however, able to tune L1
and L2 for RX just fine. I am showing 350 mV at my dummy load so some
RF seems to be getting
On 9/4/07, John Graf [EMAIL PROTECTED] wrote:
One thing you might try is a relay reset.
Thanks John, this was one of the first things I tried. No luck. I've
done most of the checks in the 155 section of the troubleshooting
guide. I'm at a loss as everything appears to be fine.
Back to it..
JT,
The quickest and IMHO the easiest way to find the problem is to build up
the RF Probe (the parts were included with your K2 kit). Then turn the
manual to Preparing for Transmit Signal Tracing in the troubleshooting
appendix. Follow the steps until you find a place where you have
On 9/4/07, Don Wilhelm [EMAIL PROTECTED] wrote:
The quickest and IMHO the easiest way to find the problem is to build up
the RF Probe (the parts were included with your K2 kit).
Yeah, I need to go buy a new DMM as I have no way to connect the RF
probe to my current DMM.
However, I just checked
Don and others,
I just returned from buying a new DMM at RS and I didn't get very far
in signal tracing the transmitter before I started getting some
strange readings.
In my previous email, I mentioned that VPWR was reading high at 4.9V.
This can sometimes point to a problem in the RF output
JT,
If you have little or no RF output, do not be concerned about the early
stages having more RF voltage than is expected when the power is normal
(and that is your case). Continue onward.
If the K2 senses no power output, VPWR will ramp up to a high level
trying to obtain more power
On 9/4/07, Don Wilhelm [EMAIL PROTECTED] wrote:
If you have little or no RF output
Exactly, this is my problem. Continuing onward.
An added note - measure the RF voltage across your dummy load.
I'm not seeing any RF voltage across the dummy load. I am only seeing
about 350 mV of DC voltage
JT,
Fine information. You have a problem between the collector of Q6 and
the bases of Q7 and Q8.
Your next step is to turn to the schematic RF Board sheet 4 of 4 and
locate Q6, Q7 and Q8 and all the components between them. Check all for
good soldering and be certain the 3 and 4 (green)
On 9/4/07, Don Wilhelm [EMAIL PROTECTED] wrote:
You should have zero ohms between the end of R54 and the end
of R53 (the ends that are connected to the T2 winding) - if not, T2
is not well tinned and soldered
Well, I am showing 12 ohms so I guess I'll have to take another look
at this bugger.
Holy cow! I got it to work!
It was definitely a improperly tinned green lead on T2. So much for
buying pre-wound/tinned 'roids to save me some grief. Heh.
Thanks Don. What a relief. Time to button it back up and continue
40M TX alignment.
--
JT Croteau, N1ESE - Manchester, NH
JT,
The green leads of T2 are meant to be long so they can be routed under
the core as shown in the manual. Mychael does a good job of tinning the
leads for the proper length, but if you tug on them during installation,
you can pull the untinned portion of the lead into the hole and the
Hi, John-
Since I am the fellow who provides the pre wound toroids, I would like to
offer that I do include a note with my K2 sets instructing the builder not
to pull the leads too tightly while installing K2-T2 . Its design is a
little unusual insofar that the toroid is spaced slightly up off of
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