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xv-144 TX alignment question please.

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Paul Radge

xv-144 TX alignment question please.

Hi all,

Wondering if someone can give me some advise please,

I'm driving my xv-144 with a TS850 which according to the ts850 manual has an output of 0-10dbm so i have chosen the input jumper settings within the xv-144 of 250mW as the lower setting is 1mW and i don't want to over drive the txvr.

I've managed to position the tx coils as per the manual but have stripped the alignment tool and have been taking to it(the tool) with a knife to try adjust the slugs with little luck on obtaining a grip on the slugs.

What i'd like to ask about is the voltage measured at TP5 and how critical is it that the final voltage measured is under 10v as per the manual.To achieve the 8-10w drive from the xv-144 that i require for my amp i'm measuring just over 13v at TP5 while adjusting the input attenuator R22.

Wondering if this is ok (?) or if i should persevere with peaking the tx coils (?)

I'm concerned that if i adjust the jumper setting to 1mW positions that 0-10dbm will be over driving the xv-144.

Any advice more than welcome and appreciated.

Kind regards

Paul

VK3DDU

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Don Wilhelm-4

Re: xv-144 TX alignment question please.

Paul,

The exact voltage at TP5 is not critical at this stage of alignment, it
is simply an indicator of the peak while you are tuning the bandpass
filters. Keep the voltage high enough for a reliable reading, but
higher voltages will mask the peak, so try to keep the voltage within
the range indicated in the manual.

Use a plastic tool that fits the slugs - if you do not, you risk
breaking the slug. Should that happen, you must change the inductor.
Better to wait until you have a good tool, Elecraft will send a
replacement if you ask [hidden email].

After you do the peaking, you will set the input attenuation to produce
full power (20 watts) with the input signal level from your transceiver,
and then you will set the LEDs to indicate that 20 watt power level
correctly. Do the adjustments in the order indicated in the manual.

73,
Don W3FPR

Paul Radge wrote:

> Hi all,
> Wondering if someone can give me some advise please,
>
> I'm driving my xv-144 with a TS850 which according to the ts850 manual
> has an output of 0-10dbm so i have chosen the input jumper settings
> within the xv-144 of 250mW as the lower setting is 1mW and i don't
> want to over drive the txvr.
>
> I've managed to position the tx coils as per the manual but have
> stripped the alignment tool and have been taking to it(the tool) with
> a knife to try adjust the slugs with little luck on obtaining a grip
> on the slugs.
>
> What i'd like to ask about is the voltage measured at TP5 and how
> critical is it that the final voltage measured is under 10v as per the
> manual.To achieve the 8-10w drive from the xv-144 that i require for
> my amp i'm measuring just over 13v at TP5 while adjusting the input
> attenuator R22.
>
> Wondering if this is ok (?) or if i should persevere with peaking the
> tx coils (?)
>
> I'm concerned that if i adjust the jumper setting to 1mW positions
> that 0-10dbm will be over driving the xv-144.
>
> Any advice more than welcome and appreciated.
> Kind regards
> Paul
> VK3DDU
>

Paul Radge

Re: xv-144 TX alignment question please.

Hi Don,
Many thanks for your reply,,,I have now emailed Elecraft
regarding a new alignment tool.

At the end of the day it appears the final voltage at TP5 is not critical
but,,, it would be nice to have the filter peaked.

Many thanks once again
Kind regards
Paul
VK3DDU

> Paul,
>
> The exact voltage at TP5 is not critical at this stage of alignment, it is
> simply an indicator of the peak while you are tuning the bandpass filters.
> Keep the voltage high enough for a reliable reading, but higher voltages
> will mask the peak, so try to keep the voltage within the range indicated
> in the manual.
>
> Use a plastic tool that fits the slugs - if you do not, you risk breaking
> the slug. Should that happen, you must change the inductor. Better to
> wait until you have a good tool, Elecraft will send a replacement if you
> ask [hidden email].
>
> After you do the peaking, you will set the input attenuation to produce
> full power (20 watts) with the input signal level from your transceiver,
> and then you will set the LEDs to indicate that 20 watt power level
> correctly. Do the adjustments in the order indicated in the manual.
>
> 73,
> Don W3FPR
>
> Paul Radge wrote:
>> Hi all,
>> Wondering if someone can give me some advise please,
>> I'm driving my xv-144 with a TS850 which according to the ts850 manual
>> has an output of 0-10dbm so i have chosen the input jumper settings
>> within the xv-144 of 250mW as the lower setting is 1mW and i don't want
>> to over drive the txvr.
>> I've managed to position the tx coils as per the manual but have
>> stripped the alignment tool and have been taking to it(the tool) with a
>> knife to try adjust the slugs with little luck on obtaining a grip on the
>> slugs.
>> What i'd like to ask about is the voltage measured at TP5 and how
>> critical is it that the final voltage measured is under 10v as per the
>> manual.To achieve the 8-10w drive from the xv-144 that i require for my
>> amp i'm measuring just over 13v at TP5 while adjusting the input
>> attenuator R22.
>> Wondering if this is ok (?) or if i should persevere with peaking the tx
>> coils (?)
>> I'm concerned that if i adjust the jumper setting to 1mW positions that
>> 0-10dbm will be over driving the xv-144.
>> Any advice more than welcome and appreciated.
>> Kind regards
>> Paul
>> VK3DDU
>>
>
>