We using pretuned HF amps with 10 mehanical memories
on 80/20/15/10 per band 2 memories for CW/SSB
and on 160/40 per band 1 memory!
once you tune the amps they will go back allways on same place!
tuning time is between 1-5 sec.
amps are from RTU-140, amp is called LV6 with single GU43B!
http://babelfish.altavista.com/babelfish/trurl_pagecontent?lp=de_en&url=http%3A%2F%2Fwww.r140.de%2F
we rebuild it for Contest use!
you can buy LV6 for about 400-500 Euro without PS
if you dont have some RF and electronic parts at your home you will need
about 1500 Euro more
to inverst to get this amp working propertly.
it´s not fast and smal like Alpha or Acom but it´s cheap and very reliable!
you cann see it in use also under this link
http://www.oe8ydq.com/cpg148/displayimage.php?album=15&pos=3
73 es best dx
de oe1ems
----- Original Message -----
From: "peter.voelpel" <peter.voelpel@t-online.de>
To: <k3lr@k3lr.com>; "'Peter'" <pc2a@pi4cc.nl>
Cc: <cq-contest@contesting.com>
Sent: Monday, September 25, 2006 5:15 AM
Subject: Re: [CQ-Contest] Pre tuned Hf amps
> Hi Tim,
>
> We do that as well at DF0CG/DR1A.
> One 20KVA supply for amps with 2xQB5/1750, similar to 4-400A but a bit
> bigger (500W dissipation).
> Additional at present, loaned modified Henry 3000D decks with their own
> P/S,
> all sitting in a separate amplifier room.
> The amps also retuned when there is a change from phone to CW and vice
> versa.
> We constructed similar amps for OTxA, where it happened that they
> transmitted without antenna for almost one hour on 80m without recognizing
> it.
> While listening on their beverages, some qsos where still made, probably
> 3by3? ;-))
>
> My own amp is with 3 of those tubes and if tuned to our power limitation,
> it
> does not matter to which portion of the band it is tuned and whether
> antennas for the band in use are differently adjusted.
>
> You will see it there:
>
> http://www.pbase.com/df3kv/image/33238173/large
>
> 73
> Peter
>
>
> -----Original Message-----
> From: cq-contest-bounces@contesting.com
> [mailto:cq-contest-bounces@contesting.com] On Behalf Of Tim Duffy K3LR
>
> USA Multi Multi stations W3LPL and K3LR are using home-brew mono band
> amplifiers. LPL uses a single 3-1000Z in each amp and LR uses a single
> 8877.
> These amps are not remote and sit close to the radio. They also need to be
> tuned between CW and Phone.
>
> Mono band amplifiers are very easy to build and as long as you have
> antennas
> with similar VSWRs there is no reason to touch the amplifier during the
> contest.
> They work quite well!
>
> You can see pictures of the K3LR amplifiers at http://www.k3lr.com
>
>
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest@contesting.com
> http://lists.contesting.com/mailman/listinfo/cq-contest
>
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