Are the internal 2m Transverter and the external XV144 the same internally?

[hf4me]

Are the internal 2 meter Transverter and the external XV144 the same
internally?

 

Is it the same board in each?

Same logic but different board layout?

Adjustment differences?

 

Thanks, Jim KG0KP

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[Don Wilhelm]

Jim,

No, they are quite different.
Different boards, different size, different logic, different adjustments.
The XV144 design point is for CW/SSB at the lower end of the band.  The
K144XV covers the entire band and switches crystals half-way.  It will
do FM.

The XV144 can be used with most any rig and can be driven to full power
with less that 1mW or up to 8 watts.  There are jumpers to set the innut
power level.  It can also use either split 28MHz IF or a single coax.
To the 144MHz antenna, you can use either one coax or a separate ones
for TX and RX.  The XV144 is thru-hole construction and it must be
assembled piece by piece.  The K144XV is SMD and if a kit, you assemble
the board and enclosure and plug in the cables.

73,
Don W3FPR

On 9/20/2017 12:36 AM, Jim Miller wrote:
> Are the internal 2 meter Transverter and the external XV144 the same
> internally?

> Is it the same board in each?
>
> Same logic but different board layout?
>
> Adjustment differences?
>
>  
>
> Thanks, Jim KG0KP
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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[Elecraft mailing list]

"The K144XV is essentially an Elecraft XV144 transverter adapted to fit into
the K3. The RX and LO parts are almost completely taken over from the XV144
so you can expect a similar level of RX performance from the K144XV.
Contrary to the XV144 the TX/RX switching inside the K144XV is implemented
by using PIN diodes, which is smaller, faster and not really a drawback in
terms of IMD. To further reduce the K144XV size the TX driver and final amps
have been completely replaced by discrete stages rather than using a RF
module as in the XV144. The design of these high gain discrete power stages
under space constraints can be a challenging task, since unwanted coupling
between components might cause oscillations. As there are no dedicated
control lines connected to the K144XV, the transverter functions are handled
by the KXV3A interface via DC voltage levels and pulses on the IF in/out
lines. TX/RX switching is maintained through an overlayed DC voltage on the
receiver IF line, whereas the transverter ON/OFF and LO range control is
managed through different length DC pulses on the transmitter IF line."


Keith, KV5J



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