[Elecraft] Follow up on "Digital modes on 144MHz only"

[Oliver Dröse]

Hi Kjeld,

I'm using the internal K144XV in one my K3s. It's very sensitive and 
stable (using the REFLOCK board, too), so no problem on that. BUT: the 
cooling design is just terrible! :-( It's all passive relying on the 
side plate of the transceiver to dissipate the heat. While this works 
ok-ish on SSB it's a nightmare on CW and especially digimodes! Heat does 
not get dissipated fast enough so the whole transverter heats up quite 
fast which results in a serious power drop, in my case from 10 watts 
down to about 5-6 watts! :-( That means instead of 1 kW output it's just 
5-600 W after about 10 minutes of operation with my PA behind. :-(

I had a second K144XV and behaviour was the same. Same is true for a 
third one at a friend of mine so I assume this is a general design flaw. :-(

I can only second Conrad's, PA5Y, suggestion concerning the HA1YA 
transverter. Very good performance and reasonably priced compared to the 
Kuhne stuff (which is probably even a tad better). Using the PRO models 
myself on 4 & 2 m.

@Wayne:
If you're reading this please make sure the planned 144/430 MHz module 
in the K4 will work much better! Serious DX on VHF is almost all digital 
nowadays and the internal transverter needs to handle that ...

73, Olli - DH8BQA

Contest, DX & radio projects: https://www.dh8bqa.de/


Am 05.07.2019 um 20:34 schrieb Kjeld Holm:
> Thanks to all who replied to my mail (see below) but allow me to ask:
>
> Anyone using Elecraft XV144 or K144XV or HG 144-K for digital modes?
>
> Any comments on these being better or worse than other brands?
>
> Vy 73 de OZ1CCM, Kjeld
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Kjeld Holm
> Sent: 4. juli 2019 20:31
> To: Elecraft Reflector
> Subject: [Elecraft] Digital modes on 144MHz only
>
> Digital modes on 144MHz only
>
> I plan for a second station to use for digital modes on 144MHz only. If you look at performance only (no price, no ergonomics, no use outside digital modes on 144MHz) what would you prefer
>
> 1)   K3/K3S with internal transverter
> 2)   IC-9700
>
> In both cases I plan to use a 1kW amplifier.
>
> Vy 73 de OZ1CCM, Kjeld
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