开云体育

Larry,

Thanks for your contribution to my education - appreciated.

Thomas W Noel

KF7RSF

On May 14, 2017, at 11:27 AM, Larry Smith <815cpu@...> wrote:

For what its's worth

Shielded wire from the DDS to the VFO input on the main PCB

Shielded wire from the tune pot to the DDS

RG174 from the PCB ant. to the SO239 or BNC (rg8X)

When running the power wires run them down low on the Metal chassis...you can tape them down.

I hope to shield if not encase the DDS from ?the main PCB.?

I may add 1000uf with parallel 100 pF to the 12v power connector pin to ground.

I removed most of the extra DDS wires.? I'm keeping those wires for future use since they have connector pins.

Try to keep any wires from passing over or under the main PCB.

So far my BITX is working and making QSOs.? I want to implement the CW mod ASAP so I can adjust my Match box for best SWR.

Right now I have my Match Box set to where I have it set for my 100 watt rig for its SWR on 40.

I also noticed last few BITX QSO contacts that the final gets pretty warm.. I put a 2"x2" 12v fan behind the heat sink ?I increased the size of the heat sink by 2x used heat sink compound and it gets warm with winded QSOs.? I run the fan from a separate 8v battery because that's what I have for now.

Just remember to keep the heat sink away/insulated from ground!!

?

My Bitx runs off a 12v 18AH battery because that's what I had.? The battery is sealed lead acid that I trickle charge using my Harbor Fright Trickle charger.? I don't leave my battery down in the shack on trickle charge 'cause I don't like doing that unless I'm around.? I also keep the doors open for air circulation.? The battery is sealed but..safety first.

I noticed when my battery runs down to 11v + my power suffers for it of course ?5-6 Watts down to 3 watts.? May use my Harbor Freight DVM connected to watch the battery Sunday.

Also important too ground to your station ground.

I hope this helps.

73

WA9DOH

On Sat, May 13, 2017 at 8:04 PM, W9ZIM <darrendude@...> wrote:

It does seem like there could be a lot more in the Wiki page since there's a lot of valuable information sprinkled throughout this group that I suspect most people will never find, mostly because they don't even know to look for it!