[ARC5] Command Sets and Interference

[Sean Barton]

Hi Group,

I replied to Dave's last message and forgot to change the send to address 
from his to the group.  Here is the jist of what I sent him.

I found that the unun I had wound was arcing.  I had noticed before that it 
was getting very warm so I figured something was up.  I can now get 50 watts 
CW from the '459 and 40 watts from the '696 into a 50 ohm dummy load.  I 
connected my roof dipole to the setup through my MFJ antenna tuner.  I can 
get a match of 1.3:1 before my tuner starts arcing.  I should be able to get 
a better match if I had a heftier tuner.  I don't have my data in front of 
me but if I remember right the antenna current for the '459 was 3.5 and 2.5 
for the '696.  This is with the vac cap in series with the transmitters.  
The TVI problem seems to be resolved.  I am getting no worse interference 
than with my Icom 751 into the same antenna.  I get a little bit of snow in 
the video of only channel 5 instead of washing out the picture.

73,

Sean
KB0OVD


>From: David Stinson <arc5@ix.netcom.com>
>Reply-To: arc5@ix.netcom.com
>To: Sean Barton <sean_ee02@hotmail.com>
>CC: arc5@mailman.qth.net
>Subject: Re: [ARC5] Command Sets and Interference
>Date: Fri, 19 Sep 2003 07:02:58 -0500
>
>Sorry it's taking awhile- lots of business travel this week
>(getting ready for 200 mile round trip today).
>
>Sure wish I could be there to "eyeball" your setup.
>Doesn't match my data very closely.
>Perhaps we're dealing with a VHF parasitic in the 459.
>I've heard they happen, but I've never personally seen one occur.
>Have you gone through it pretty well, checked for corrosion at
>screws (effects grounding), connections at the pins of the 1625s,
>solder joints in the PA/tank circuits?
>I've got to dig out that data chart I made.
>Will try to get to that this evening or tomorrow morning.
>73 DE Dave Stinson AB5S
>
>Sean Barton wrote:
> >
> > Group,
> >
> > Here is a progress report.  I wound a better 4:1 UnUn tonight and 
>collected
> > this data:
> >
> >                   BC-696           BC-459
> > Roller           0                   0
> > Coupling       10                 10
> > Current        1.0                 0.5
> > Power          8W                5W
> > Connected directly to the UnUn.
> >
> >                   BC-696           BC-459
> > Roller           13                 10
> > Coupling       5                   1.75
> > Current        3.5                 6
> > Power          9W                10W
> > Connected to the UnUn through the vac cap.
> >
> > Current reading from BC-442, power into 50-ohm dummy load.  I'll try to 
>load
> > a dipole in a couple of days and give a report of the results.  BTW, I
> > forgot to mention earlier that both transmitters have NOS pairs of 1625
> > installed.

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