Message-ID: <4BAFAA2C.90305@dsl.pipex.com>
Date: Sun, 28 Mar 2010 20:12:44 +0100
From: tim hague <m0afj@dsl.pipex.com>
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Subject: Re: Fw: LF: ATU
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Graham wrote:
> Follow  on from 2008  ... was it that  long ago  ?
>
>>> parallel , Worked well on rx and would handle up to  25 watts on tx
>>> before the plates flashed over ! but easy to  make easy to tune ,
>
> Re hashing the  Cap  so  there  was   2 sets  of  plates in parallel  
> and then in series  with the  other  2 plates .. doubled the gaps , 
> .useing the shaft as the  coupling  link  .. we  where  pushing the  
> envelope  in those days ...
>
> G ..
>
>
>
> --------------------------------------------------
> From: "Tim Hague" <m0afj@dsl.pipex.com>
> Sent: Tuesday, October 07, 2008 3:58 PM
> To: <rsgb_lf_group@blacksheep.org>
> Subject: Re: LF: ATU
>
>>
>> Graham wrote:
>>> Simple tuner
>>>
>>> If it works on top band, then it will work on 500 (with a bit more C)
>>> .. this is a simple parallel tuner , with a WW2  ex usa surplus
>>> transmitter coil, and a  2000 pf capacitor 4 x 250pf  wired in
>>> parallel , Worked well on rx and would handle up to  25 watts on tx
>>> before the plates flashed over ! but easy to  make easy to tune ,
>>> rx/tx tapped 2 turns from the bottom and the  Ae direct to  the top
>>> (the knob is from the B set .. ws19)
>>>
>>> http://uk500khz.googlegroups.com/web/Parallel+ATU?gda=AekYBT4AAAD_AR9CZEwmTaUFcglf9MHbexqv2sBQZsAxVg3n14BVSpRSVTbPEv7Iv69fZDO_RFvjsKXVs-X7bdXZc5buSfmx 
>>>
>>>
>>> G ..
>>>
>>>
>>>
>>> *From:* Chris <mailto:c.ashby435@btinternet.com>
>>> *Sent:* Monday, October 06, 2008 11:12 AM
>>> *To:* RSGB lf Group <mailto:rsgb_lf_group@blacksheep.org>
>>> *Subject:* LF: ATU
>>>
>>> Hello Tim,
>>> My ATU is really a large matching coil. It consists of 130 turns of
>>> insulated solid copper wire on an 11.5cm dia. cardboard former (carpet
>>> roll centre) tapped every ten turns (course tuning) in series with a
>>> coil of 22 turns of 18 swg enam. copper wire, 7cm long, 6cm dia. and
>>> tapped every two turns (fine tuning). I find this will resonate my
>>> 124' wire from Medium Wave, through 500kHz, to all the NDBs.
>>> I built this so I could use it for TX one day. If you are going for RX
>>> only, take a look at 'LF Today', second edition, p14 and 15. This is
>>> my next project, got all the parts, building this week.
>>> All the best.
>>> Vy 73,
>>> Chris, G4AYT, Whitstable, Kent.
>>>
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>> No virus found in this incoming message.
>>> Checked by AVG - http://www.avg.com
>>> Version: 8.0.173 / Virus Database: 270.7.6/1709 - Release Date:
>>> 10/5/2008 09:20
>>
>>
>> Thanks Graham, I've actually got a full set of these coils which came
>> from Hanslope Park, I wonder what they were used on.
>> Anyway I've found a suitable cap from a high power MF Tx on another site
>> so when that arrives I'll be well away. I understand its possible to get
>> some power
>> out of my 756PRO3 so then I'll have a look at that next..
>>
>> Tim M0AFJ
>>
>>
>
>
>
>>
>> No virus found in this incoming message.
>> Checked by AVG - http://www.avg.com
>> Version: 8.0.173 / Virus Database: 270.7.6/1712 - Release Date: 
>> 10/7/2008 09:41
>>
>
>
>
>

Blimey Graham, I'd totally forgotten about that!, old age is really 
creeping up!!, anyway NoV is ready to be sent off tomorrow, so shouldn't 
be to long before
I can radiate a signal on the band..

73
Tim