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Re: [IRCA] New Grayland SDR WAV Files
- Subject: Re: [IRCA] New Grayland SDR WAV Files
- From: Chuck Hutton <charlesh3@xxxxxxx>
- Date: Tue, 4 Sep 2018 02:45:53 +0000
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- Thread-topic: [IRCA] New Grayland SDR WAV Files
Theory says the mod has no real effect above MW and little effect on MW..
It seems that reality may differing from theory as some report a noticeable MW improvement.
So with nothing to lose it will be tomorrow's project to bypass R3 also known as C3.
Chuck
________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Guy Atkins <dx@xxxxxxxxxxxxx>
Sent: Sunday, September 2, 2018 10:59 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] New Grayland SDR WAV Files
Hi Ken,
Good question! I forgot to mention that my HF+ SDRs have the "R3 bypass
mod" as well as latest firmware installed. The designers of the HF+
expected hobbyists and experimenters to configure and modify the antenna
input characteristics, so they made it easy with a larger SMD chip
capacitor in-line to the HF antenna input. (Despite being called R3 it is
actually a resistor.) Changing or bypassing this part affects the impedance
curve of the radio, if I remember right.
Initially thought to only help out long wave, it actually gives a decent
boost to medium wave sensitivity too, all the way up to 15 MHz per some
reports. Top DXer Bjarne Mjelde, among others, has confirmed the R3 bypass
improvements-- see his review of the HF+ here:
https://app.box.com/s/d2dni57dzrsxgs38gxbbfz9gm26brqpk
The last few firmware updates resulted in even better RF overload
performance on the HF+, and this on a radio which was already receiving
accolades for excellent strong signal handling.
73,
Guy Atkins
Puyallup, WA
On Sun, Sep 2, 2018 at 6:46 PM, ken brookner <kenb@xxxxxxxxxxxx> wrote:
> Hi Guy,
>
> Was that an unmodified HF+?
>
> Thanks for posting your comparison!
>
> 73,
>
> Ken
> Lummi Island, WA
>
>
>
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