and emitter (ground) or Q2 on the front panel board. Any value between
will cause the overload condition. I recall you are driving the XV432
> Don,
>
> Thanks for your reply. It's great to get feedback here so quickly,
> especially as I managed to delay my question until a weekend.
>
> I understand the section of the manual regarding 10 volts at TP5. What I
> meant to indicate is that I cannot get anywhere near 9 or 10 volts at TP5
> following the normal alignment procedure, regardless of whatever setting the
> input attenuator is at. I've followed the procedure by the manual,
> carefully, many times. Despite repeated passes through the peaking process
> (many more than three or four, I'm afraid), I cannot get over 15 watts
> output or over 7.5 volts at TP5 regardless of the input attenuator setting.
> I've since checked the coils to be sure I have the correct ones in the
> filter.
>
> K3 is set up for 1.00 power out, as instructed.
> The fact that the overload LEDs are lighting up at the high end setting of
> the input attenuator leads me to believe that the IF in from the K3 is ok,
> and that both pre-filter amplifier stages are working as intended.
> Adjustments of FL1 and FL2 are smooth and have a clearly identifiable peak,
> leading me to believe those are ok. I'm not seeing any voltage changes
> elsewhere in the transmit chain, and the rest of the device voltages look
> good.
>
> I made several attempts at alignment since your email, with no more success
> than earlier. As I am concerned that the PA module may be flaky, rather
> than fry the thing by continuing to tune, it's going back to Elecraft on
> Monday for them to have a look. I'll follow up here with the results.
>
> Thanks again for your quick response.
>
> 73,
>
> Don Appleby W3MW
>
[hidden email]
>
> ----- Original Message -----
> From: "Don Wilhelm"<
[hidden email]>
> To: "W3MW Don"<
[hidden email]>
> Cc:<
[hidden email]>
> Sent: Saturday, August 06, 2011 5:15 PM
> Subject: Re: [Elecraft] XV432 Issues
>
>
> Don,
>
> The manual doesn't state that you must adjust for 10 volts at TP5.
> Please read that section again.
>
> It does say that you should not exceed 10 volts at TP5 during the
> bandpass filter tuning.
> If the output goes above 10 volts, use the input attenuator R22) to
> bring the voltage down - perhaps in the vicinity of 5 volts, and then
> continue to look for the peak tuning point for each inductor that is to
> be adjusted.
> Go back over the peaking procedure 3 or 4 times.
>
> After you have peaked the bandpass filters, you will then adjust the
> input attenuator to produce the correct output (use an external power
> meter which is accurate at 432 MHz) while your selected maximum drive
> level is applied from your transceiver.
>
> After that (and while the transverter is producing 20 watts), you adjust
> R10 (Power CAL) so the LEDs indicate 20 watts.
>
> These 3 steps must be done in order - do not skip ahead or you will end
> up with frustration. Also, do not drive the transverter for too long at
> a time - particularly during the final power adjustments. Give enough
> "break" time to let it cool between adjustment trials.
>
> 73,
> Don W3FPR
>
>
> On 8/6/2011 3:27 PM, W3MW Don wrote:
>> I've just finished assembly of the XV432 kit, interfaced to a K3, and ran
>> into two issues during alignment in Part VI, Filter Alignment.
>>
>> First, during CW key-down, the voltage at TP5 peaks immediately, then
>> slowly drops off until it is a volt or more lower than peak. Immediately
>> re-keying gets a somewhat higher voltage than at un-key, but not at the
>> peak. Letting it sit a minute or two, then re-keying, gets the original
>> peak voltage back. Output power does the same fade.
>>
>> Second, the 28 MHz filters don't seem to be aligning properly. I've set
>> the cans at the set-points in the manual, but L15 and L16 seem to peak
>> with the slugs out of the cans. L17 appears to peak ok, and the 432
>> filters both seem to peak fine. At the best point of alignment, I am
>> getting less than 7 volts at TP5, vs, 10 required for full output. I've
>> checked the K3 output, and the BNC cables, both are fine. The input
>> section of the XV is easily able to overdrive the input to the 28 MHz
>> filters, as evidenced by D10 and D11 lighting up at roughly half setting
>> on the input attenuator. Max output from the PA is around 15 watts
>> without lighting up D10 and D11. I've pulled and checked the five caps
>> around the filters, all are within tolerance. Oscillator alignment was
>> fine, 3v at TP1. I've tried re-aligning these three cans several times,
>> including bottoming out the slugs and working back up, with no change.
>>
>> I'm on the air with it at the moment, and it seems to be working other
>> than the low power output.
>>
>> Any thoughts?
>>
>> Don W3MW
>>
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