Hi Pierre,
1. The consensus opinion seems to be that using Inrad's 600hz roofing
filter in the 1Khz slot provides all the roofing filtering that is
ever needed for the toughest cw conditions (i.e., contesting and
topband). Therefore a mod such as you suggest has never been pursued.
2. Can you provide more information on who is selling the subrx
filter? I've never seen mention of this before.
Merci & 73,
Barry N1EU
On 7/6/07, F3WT <ars.f3wt@wanadoo.fr> wrote:
> Hi all,
> 1° It seems to me that putting off serial second stage amplifier-
> bank for roofingfilters 500Hz and 250Hz and paralleling them with the
> others ( 1kHz, 1.8; 2.4; 6 and 15kHz) does seem to be an easy mod
> albeit a delicate SMD operation - for the hardware part ( merely
> unsoldering or removing right 0.1MicroF capacitors of second bank
> and paralleling them with the first bank). Does anybody know if this
> has been done?
> As well as the sw or hw mod to disable the first bank when the
> second is on?
>
> 2° A reseller in Germany sells ( probably Inrad) roofingfilters for
> the Sub-Rx. Anybody knowing these? Has Bill's (W4ZV) former survey on
> this succeded?
>
>
> Thanks for any hint.
>
> Pierre
> F3WT
>
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