I got the kits, now to learn how to do SMT soldering.

Anyway, I measured the actual resistance of my stock of potentiometers to use with the kit, and none of them go all the way to 0 ohms - the lowest is about two ohms.? Seems to me like putting an extra 2 ohms in the antenna input line is not a good idea - or am I missing something here?
Would a higher quality potentiometer be more likely to actually get to 0 ohms, in the event this actually is a problem?

Appreciate any words of wisdom anyone can offer!

I can receive BBC Radio Four on 198 Khz with mine.

Philip G7JUR

Mike

thx for tech inputs , yes i got the details from this post?
AM allows for 5KHz of audio and SSB allows for roughly 2.7 to 3 KHz of audio
to change this filters required?

thx?
de
vu3pen
sridhar?

I’m suspecting the 10ohm resistor R43. I’m not experienced at all with smd and perhaps I ruined it with my iron. I only have a 47ohm replacement. I will replace with that and see where I get. I can’t see it being the problem with the drop in power and mic audio level though...?

Carl.

Correction:? use the step attenuator to reduce the strength of your main signal FROM the dummy load?
You likely want a pretty serious resistive divider between dummy load and step attenuator,
The step attenuator might be able to disspate a Watt, maybe less.?

开云体育

Yes, I got the Siglent SA, and sold the old Rigol on eBay.

What a difference.? So Rigol and Siglent are at the top of my list.

And remember the 2 day discounts by Circuit Specialists, usually 15% can be significant on a big purchase.

I would go for a bigger screen the on the Rigol scope.

And yes, the 100 MHz upgrade on the internet worked perfectly.

I am glad they are now just unlocking things.? Hiding features for Ransom seems kind of counter productive

to good bossiness practices?

Mike, WA6ISP

Just to throw another good scope in the mix is the Siglent 1202X-E for $380. 2 channels, 200MHz all the bells and whistles come unlocked, no hacking necessary. A great scope, I love it.

Eevblog did a review about a year ago,?

Ralph

N9WTX

On Fri, Jun 22, 2018 at 10:52 Ralph Mowery <rmowery42@...> wrote:

I have seen on youtube where some have flashed the software in some of the scopes and other devices to raise them up to higher levels.? There may or may not be some small components in them that limit the bandwidth so you may not be able to get the traces to show a true waveform at the higher frequency.

At the least you would have o get better probes for the scope.

The Hanteck 200 mhz scope I have does not seem to do the XY patterns very well.? I have to drop back to my old Tectronic analog to do that.? Maybe a better quality digital scope will do the XY patterns better than my inexpensive Hanteck

de ku4pt

On Fri, Jun 22, 2018 at 11:26 AM, Michael Hagen <motdog@...> wrote:

I got my Rigol on eBay, new just a few hours.? DS1054 for about $370.? Had to do the 100MHZ operation.

They have newer ones now, better, but more $.

I like it, but for the price I think the Hantek 200 MHZ is a better deal, especially since Jack likes his.

Circuit Specialties has sales once in a while, I got 15% off my Spectrum Analyzer from them.

I had problems with the Hantek USB scopes, did not like them.?? I would never buy a PC connected scope again.

I seldom use more than 2 channels?

The Rigol is actually TOO SMALL.? Too many features and screen is small, I can't see all the stuff.

Strange, my Rigol? has 1 flaky probe already, AND the Ground Alligators take BIG Muscle to open!

They sure have a real spring in there!? They surprise me every time I clip.

Mike, WA6ISP

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Ok

I read there is a software hack to extend its HF response. Haven't tried it yet.

Here's the one I got:



It's not fantastic, but it's still more usable than what I had.

Make sure you are using an insulating kit including the screws and the back either mica or other insulator. No continuity between the gates after mounting the irf510's
Using the insulating mounts you wont have to worry about the 12DC being shorted to ground by accident if using a metal case. Since the IRF510 are 180 degrees out of phase if they short on the heat sink you will blow?them, like I did.
Hope that helps
C?

I have just built a uBITX with standard components (no SMD's) from scratch on a PCB I designed - it works well.? I have now designed another PCB which incorporates the Arduino NANO and the the Si5351 shield and I'm just waiting for the PCB's to arrive and then I will start assembling.? I made some changes to the circuit to allow for a dynamic microphone and the use of screened TOKO cols for the 30MHz lowpass filter, I also changed the coupling arrangement to the 45MHz filter.

I have attached a picture of the original PCB and a PDF of the new layout incorporating the Arduino and Si5351

Maybe one day I will play with SMT but for now standard components are still easily available !
?
73's - Peter M0HYT

I just need some clairifaction on replacing the heat sinks on uBITX. ?I am in the process of maching out a new heat sink, which will be one piece. ?If I am correct, ?if I mount each FET with the correct mounting pads and they don't touch they should work fine or am I missing something here. ?I just don't want to manufacture a problem.?
Thanks, 73
Buddy, KJ4ZSI