Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: OT: Racal vra549c Tuner

To: [email protected]
Subject: Re: LF: OT: Racal vra549c Tuner
From: Andy Talbot <[email protected]>
Date: Tue, 28 Jun 2016 22:15:55 +0100
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=gJFC7epTpSthwSxx3cM/ZzaDq47DuIWwWz9f7ucAnKA=; b=Mf/gDtrcGEAmYqgb8Co1CiLKc8bg6TnW0Pc2DebGWAICBXcIcUX5yOxyrDCvFFc5l5 AQbuS2vgj5nJ0hO6FseUu6FjHHdOKClZvkS+C9tGCWTzWx3aDelGcbbybtSYNt9ifWaU d0e3tCbf5lgFCq1vu/a58eNl/PWz5WoFBHVmZCCUYt9auKgUTfYtP3DhoTzI6hkRYVAo vvEZFetk53YhnKgnMrsIKivTTjSQ3l6golyT4cp9JRKwWeqXO8V842jXkI7iFPgBwmS1 YCdPC0gKAzGwifUbVU7/VRfk+z+51NZyvlMmWlff+aD65dWjCNuR3JqCsuUXdgHUPWfT 1Q6Q==
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
It is not that specific model, but I do have a small man-pack type Racal auto ATU that has a not totally dissimilar output stage

2C10 is 68pF
2C13 is 180pF

But in mine 2C11 does not exist.

The main inductors and capacitors use the same configuration, except that a bank of inductors has a separate bypass to reduce stray L at high frequencies.

The circuit diagram can be found at http://www.g4jnt.com/DropF/racalatu.gif
I don't know its type number, I only had the PCB and it is now mounted in a diecast box I don't want to dismantle

Andy  G4JNT


On 28 June 2016 at 21:14, Peter <[email protected]> wrote:
Hi All,

Off topic:
I need some info about the Racal vra549c antenna tuner.
All I have is the schematic:
http://lf-radio.de/misc/sw/Racal_vra549c_schem.png

I'm looking for the values of those 3 capacitors at the
antenna shown on the right: 2C10, 2C11, 2c13. I know
that they are intended to rotate/shift the antenna
impedance into a region where the subsequent circuit
can handle it (guess above ~10 MHz).

???

73 de df3lp,
Peter


<Prev in Thread] Current Thread [Next in Thread>