Re: LF: DECCA AMP

[Andy Talbot <andy.g4jnt@gmail.com>]

My 700 Watt design could probably  be increased to over 1kW now with more modern components.  Take a look at http://www.g4jnt.com/137tx.pdf

Andy  G4JNT

On 8 February 2018 at 18:34, <g3kevmal@talktalk.net> wrote:

Chris

I do not have any spare amps but I think G7NKS/JIM has some units, maybe you could ask him.

If you look at the Decca 5501 info on the web you could build a copy which would be very reliable. It uses a bridge cct which most commercial manufacturers favour compared to push pull etc

See attachment of a similar amp that would be simple to build and reliable and give around 1Kw output. It is a standard cct nothing special about it. Where it says OUT1 and OUT2 use a series resonant cct for the freq of interest, similar to the Decca cct then a matching ferrite transformer to match the FET 8 ohms approx to 50 ohms.

 

 

From: Chris Wilson dead.fets@gmail.com [rsgb_lf_group]

Sent: Thursday, February 8, 2018 3:54 PM

To: g3kevmal@talktalk.net [rsgb_lf_group]

Cc: dead.fets@gmail.com

Subject: Re: [rsgb_lf_group] Fw:

 

 

Hello g3kevmal@talktalk.net,

Thursday, February 8, 2018, 3:29:21 PM, you wrote:

are there any of the old Decca units still available anywhere Mal? I have
an Ebay watch on them, for years in fact, never seen one.... Nice set
up! Shame my TS-590 got zapped it was a good transceiver.

>
> MF/630M GROUP
>
> See attached picture of my 474.2 Khz equipment
>
> TS590 TRANSCEIVER/MODIFIED DECCA 5501 SINGLE UNIT AMPLIFIEER/'SCOPE to
> monitor outgoing signal.
> apeed,
> it was a good transceiver.
>
> Anternna is an INV L 1/4 WAVE ON 630 METRES UP 100 feet approx vertical and
> the rest horizontal. Antenna used for TX/RX with alt RX antenna, my 160m INV
> L 1/4 WAVE UP 80 feet vertical and rest horizontal and resonated for
> 630metres when in use
> My QTH is in the countryside and antennas are in a field away from
> environmental local noise.
> I have a selection of HF antennas for all other HF bands selected as
> required.
>
> 73 de mal/g3kev/io94sh

--
Best regards,
Chris mailto:dead.fets@gmail.com

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Posted by: Chris Wilson <dead.fets@gmail.com>

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