Topband: Anyone have a boat load of J-310s?

[Mike(W5UC) & Kathy (K5MWH)]

On 8/25/2013 6:29 PM, Charlie Cunningham wrote:
> Gee, that's really interesting, Andy!  I also built a much simpler
> oscilloscope when I was a teenager and new ham! Yours was a really elaborate
> and impressive 'scope project! Congrats!
>
> Glad to hear from someone who has experience with the KAZ and flag antennas.
> My KAZ was for 160 and terminated in 1000 ohms - mostly because that's what
> I had on hand. It was a very good RX antenna for 80, 40 and 30m as well.
>
> Your preamp sounds very interesting!  It must be fairly elaborate, if it
> uses 8 of the J309 FETS! I'd be interested in the circuit!
>
> Best regards,
> Charlie, K4OTV
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Andy Ikin
> Sent: Sunday, August 25, 2013 6:32 PM
> To: Charlie Cunningham
> Cc: Topband Reflector
> Subject: Re: Topband: Anyone have a boat load of J-310s?
>
> Charlie,
>
> When I was poor man 40 years ago, I always wanted  Tektronix 545B Scope,
> which I couldn't afford. So I built a "Chinese Copy" with discarded parts
> from the Calibration department of the computer company I worked for. The
> scope use many 6DJ8s. I did get it working after about a year; not bad for
> some one with no formal electronics training!!!! Tektronix were very helpful
>
> in supplying some critical parts. Looking back I must have been mad, but it
> was one hell of away to learn how these things work.!!!!
>
> Bye the way I manufacture a special Head Amplifier for the KAZ and other
> Flags. This has 1100 Ohm input matching/isolation transformer, about 20dB
> gain and a less than 1dB NF and uses 8 x J309s plus a string of 1N4148
> limiting diodes. Wellbrook FLG100LN. There are about 70 units in service
> mainly in the US with MW Dxers.
>
>
> 73
>
> Andrew G8LUG

Andrew, i used a antenna similar to the KAZ when I first was on 160, 
except I fed it in the middle of the horizontal bottom leg(6 inches 
above ground) just like a K9AY, using a 9:1 xfrmr.

It worked like a dream.  I used two mounted at right angles just like a 
K9AY and rigged it to work in 4 directions like a K9AY,  1000 ohm 
termination worked great.

http://www.suddenlink.net/pages/w5uc/160.html#The%20K9AY%20Type%20Array

73,

Mike, W5UC
>