[ICOM] Mods for IC-2KL

[PA3DUV]

Hi Bert, Adam,

Check www.qsl.net/pa3duv for the qsk mod on the 2 KL. I actually own 2 IC2kl 
amps and did the qsk mod on both amps. It takes one evening to do the qsk 
mod. Basically  I used the QSK mod from Rich Measures (www.somis.org) and 
modified it for the 2KL with it 48 volt collector voltage.
The qsk mod involves exchange of the input relay for a high speed Matsusita 
reed relay and the sloow output relay for a Kilovac HC1 or similar. I made a 
hot shot circuit consisting of a high voltage switching transistor and the 
bypass resistors and diodes on a small copper clad epoxy board, using 
ordinary hand tools. See the pictures on my webpages.

I replaced the fan of one 2KL for a new compatibel axial Pabst fan which 
made the amp less noisy. Also I keep the fan running on low revs during 
receive and on high rev during transmit and receive when the temperature 
switch kicks in.

The same fan mod was carried out on one of the IC2KL PS, also the 2 small 
fans in the power supply cooling the regulator were replaced by high quality 
axial fans.

I also changed the filter unit cover of my oldest IC2KL. The filter unit of 
the older models is not ventilated, the cover completely seals off the 
filter unit. Consequently the parts in the unit heat up quite a bit, that 
sometimes  results in failure of the silver mica caps in the filter unit. 
The newer IC2KL models have a modified filter unit cover allowing air to 
enter and to escape at the top.

Cheers, Dick Knol
PA3DUV

----- Original Message ----- 
From: "Adam Farson" <farson at shaw.ca>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Friday, January 28, 2005 7:17 PM
Subject: RE: [ICOM] Mods for IC-2KL


> Hi Bert,
>
> If the IC-2KL is the standard model with all bands active (as opposed to 
> the
> US model minus 10/12m), no mods are required. If it is the US model, and 
> has
> not had 10/12m enabled, the required parts kit is still available from 
> Icom
> America in Bellevue WA. There is a complete set of IC-2KL and AT-500
> documentation, including the 10/12m enabling procedure, here:
>
> http://www.qsl.net/icom/manuals.html
>
> The existing fan is usable, if rather noisy; it can be replaced with a 12V
> muffin fan of identical dimensions.
>
> The QSK mod is very extensive, as it involves fitting vacuum relays to the
> RF unit. I would tend to stay away from it.
>
> You may also wish to consider buying an AT-500 autotuner and teaming it up
> with the IC-2KL. You will need an OPC-118 adapter cable to connect the
> control cable to an Icom transceiver which has the DIN ACC(1) and ACC(2)
> sockets.
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of Bert
> Sent: 28 January 2005 06:41
> To: Icom reflector
> Subject: [ICOM] Mods for IC-2KL
>
>
> I've just bought a 2KL and I'm interested to know what mods I should
> condsider. Last week I read a message on the reflector from a Dutch ham, I
> can't remember his call, who mentioned about the fan, QSK and something
> else.
>
> Looking forward to your suggestions. Thanks.
>
> Bert, VE3OBU
>
>
>
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> ----
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