Does anyone want my ubitxv6?? I am done.

Those spaces were designed to permit adding a cw filter in parallel.?

Curt

Are the parts in the circle missing or should they not be there?

On Sat, Apr 24, 2021 at 08:32 PM, Curt wrote:

I imagine there are numerous ubitx with fans pictured on the web - so go on a tour!?

Ahh yes, the ole just because others have done it, it must always be correct. Because people have always used parts outside their design specifications we will have to do that in all eternity.? The hobby is full with those statements .I sometimes wonder how humanity ever was been able to leave caves and evolve lol.

Jim,

I’d be interested in purchasing the Teensy 4.1 adapter kit from you. I have the uBITX v6 so it sounds like there wouldn’t be any problem with the conversion. I have the Nextion 5” Enhanced Display. Will your adapter work with this display? ?I’m not sure how to go about finding your email address, Can you provide your email address for me or explain how I would go about getting it? Thank you in advance.

73,
Robert, AG6LK?

Someone stumbled into an old thread. I am thinking this multifunction board wasn't developed, it was a collection of ubitx add on. Not sure it cured v3 v4 spurious (-:? it even was going to host my favorite simple audio agc. Maybe it was mentioned about same time or after the jackal. In earlier ubitx stages many third parties were making various boards small and big. Seems this all waned with v5 and v6 where displays have had a larger focus.?

Curt

I imagine there are numerous ubitx with fans pictured on the web - so go on a tour!? Thermal science of transistors is a bit abstract even working with PhDs I work with - so stay with your conviction on how much air you want to move.? I haven't yet down FT8 with my ubitx - but it tends to be shoot with what you have mode - I imagine big stations may be running hundreds of watts - but certainly QSOs can be had with a stock ubitx.? The fans in my switching power supply scream a bit - possibly you might want a switch to turn it off when doing CW and SSB - your call its your custom ubitx.?

73 Curt

What board is this?

Gerry. VE4GKS

Sent by the Thunderbird

2 board here as well, Thank you.

A one inch fan moves enough air over those heat sinks, anything bigger is a waste as the air just bypasses the sinks.At work, we cool a lot more than those puny heat sinks with one 1 inch fan . There isn't that much heat to be removed. If one is really that concerned especially for digital modes replace the transistors with one that can be directly grounded and use a heat sink / copper spreader arrangement. I don't like using insulators under those transistors since if the heat sink is grounded you end up with added capacitance that will reduce the output power at the higher frequencies even more.

Please put me on the list, too.

Steve?
KB1PSU

开云体育

A 1 inch fan wouldn't move much air.? Try something a little bigger.

73

VE4GKS

Sent by the Thunderbird

On Sat, Apr 24, 2021 at 10:17 AM, Mark - N7EKU wrote:

Doesn't FT8 depend on your audio level settings?

Mark,
You are correct.??

Chuck,
Do you have a power meter to see if there is a significant power difference?? That could help explain what is happening.? If nothing else measure the peak voltage on the dummy load.? We are only looking for relative readings, not accurate.

The other variable is how long are you holding the key down when testing CW.

73
Evan
AC9TU

A small 1inch fan might be all you need. You can slow it down to a point where it doesn't makes irritating noise since all you need is a slight breeze not a hurricane.?

Doesn't FT8 depend on your audio level settings?

Oops! Too many forums, LOL.

73,
Robert, AG6LK

Chuck

Reminds me of discovering the hot regulator on the arguing board thinking I had damaged it.?

As Bill suggests, 15 seconds of ft8 twice a minute is more punishing than cw or ssb. While some may adopt bigger heating, a little fan would help. Funny thing these transistors are robust, over voltage from very bad swr might get them before heat.?

73 Curt