Date   
Re: new uBitx question

Curt
 

Craig

overall its a different sounding receiver - without AGC there is minimal (but enough) gain available. 

based upon your description - I wonder if the BFO adjustment is way off.  Before concluding this, tune very slowly to see if you can get the SSB signals tuned in.  When the BFO is properly adjusted SSB should sound very nice. 

note AM signals are received as one of the sidebands - so not possible that AM can sound good but not SSB. 

Curt

Re: new uBitx question

newoldham
 

Ok, back to it finally - tiny bit of new input:

Was able to tune in a local AM station - sounds decent - tuned BFO with that, for better or for worse, but in the end, it was already ALMOST ok, and now it is certainly "listenable."

The strong tones were NOT present near that particular station.

I take back what I said before, sometimes it disappears entirely if I unhook the antenna, other times, it stays.  Two different problems, I suspect.

On several bands (20/40/80), I hear some garbled ssb, it's never very clear - but it may never be English I'm hearing.  I know the bands aren't grand right now, and I'm not expecting to catch a lot of conversation - my sdr pretty much
confirms the few noises I hear.  But far too often - the annoying tone comes with the SSB - what is it that I'm hearing?

however - on 40m and less so 20m, i hear an absolute ton of CW - and it never has an interfering tone.  Clear and lots of it, I'm having fun getting back into it.  My main plan for this thing was CW anyway.  This pretty much confirms it's an artifact of the SSB decode process - no?

So to summarize...CW crystal clear - I have not transmitted yet - and SSB miserable, while broadcast AM is fine. 



Re: Look at this on eBay, ubitx, budget test equipment.

iz oos
 

My HF antennas are DC short circuited but I always unplug them when not in use. You probably can add a bleed resistor across or eventually an inductor big enough and with a high inductance, but in any case unplug it, always.


Il 13/mag/2019 18:04, "Kelly Mabry" <kmabry2007@...> ha scritto:
And no I did not unplug the antenna. I usually do unplug as a habit, however this time i did not.
73,

Kelly K5AID 

Re: Look at this on eBay, ubitx, budget test equipment.

Kelly Mabry
 

And no I did not unplug the antenna. I usually do unplug as a habit, however this time i did not.
73,

Kelly K5AID 

Re: Look at this on eBay, ubitx, budget test equipment.

KM4TRT
 

I also have a cheap (50) signal generator(feeltech 3200s dual channel).0-30 MHz  It does most everything I want for HF and was able to trace the signal on several bit x's with my scope.  The only thing Is that dual channel does not output two different frequencies, so you can do dual tone.
I'm certainly no expert, but I bought a scope for $50 at a ham fest and found it somewhat difficult to use.
I bought a digital new (Hantek) for 200 and love it .  I can run dual traces and it goes to 200 MHz.  Actually tested with an arduino generator and it was over 200 MHz before the signal detererated.

Andy kKM4TRT

Re: Look at this on eBay, ubitx, budget test equipment.

Kelly Mabry
 

Hi guys, thanks for all the recommendations and ideas. 
All of these ideas are not just food for thought, It is a meal worth savoring... thank you everyone. I am going to remove the AGC for now, restore the severed rf path and evaluate. 

73, and thank you everyone!
Kelly K5AID 

Re: Dave West --PLEASE DELETE

Arv Evans
 

Raj

Interesting that the photo is visible to some and not to others.  I even logged into the
BITX20 group to see if his post there showed the image but it was not there.  I am
using Firefox on Linux so maybe there is something different between types of browser
being utilized by different people.

Arv
_._


On Sun, May 12, 2019 at 11:02 PM Raj vu2zap <rajendrakumargg@...> wrote:
I can see the photo Arv, an old gentleman with a violin!

At 13-05-19, you wrote:
>Donald
>
>Seems that the photo did not come through.  Maybe a good thing...?
>
>Arv




Re: 3rd Party Raduino Board #radiuno

Mike Short
 

I have purchased several from them, and they are an improvement over the stock Raduino. You will not be disappointed. The boards they sell for the jacks are very nice as well. 
Mike
AI4NS 

Re: How to stop worrying and love the uBitx #ft8 #cat #antennas #ubitx

Vince Loschiavo
 

Gerry
which kit is that in the tin??
vince

Re: How to stop worrying and love the uBitx #ft8 #cat #antennas #ubitx

Gerry Kavanagh
 

Looks like a posh version of this:

3rd Party Raduino Board #radiuno

Ted
 

I've seen the TSW board kit and it looks nice enough. What else do folks here choose from when they're sure their Raduino is toast?  Which is the "preferred" sourcing for these ?

Please don't recommend simply asking other users for their excess stock, as that's obvious (and risky, unless the Nano is socketed apart from the Raduino).



73,
Ted
K3RTA


Re: Look at this on eBay, ubitx, budget test equipment.

iz oos
 

Hi, do you know the chip inside? AD9851 maybe? How many dbm is it rated?


Il 13/mag/2019 14:11, "Richard Seguin" <richard.seguin@...> ha scritto:
I have a signal generator like the one that you posted.  It's working
well for me so far.  I suggest building a 6dB attenuator and hooking
the sig gen to that when you want to measure RF signals though.

Richard (VE1X0R)



Re: Look at this on eBay, ubitx, budget test equipment.

Curt
 

Kelly

first, best to unplug rig from antennas even when you have lightning arrrestors.  or be blessed by a switch that grounds antennas not in use. 

second, I am still thinking storm may not have taken out your ubitx.  yes try soldering something across that RF attenuator to effectively move it out of the circuit - let's hope it is this simple!  If this AGC is installed similar to the VK3YE - there are no ubitx connections changed - so I am doubting it is in the act.  I really think it may be something simple that has opened up. 

17 wpm - I would not fret your CW capability - this is nearly top end for straight key use.  plenty of QSOs can happen at that speed. 

73 Curt

Re: Look at this on eBay, ubitx, budget test equipment.

Richard Seguin
 

I have a signal generator like the one that you posted. It's working
well for me so far. I suggest building a 6dB attenuator and hooking
the sig gen to that when you want to measure RF signals though.

Richard (VE1X0R)

Re: Look at this on eBay, ubitx, budget test equipment.

_Dave_ AD0B
 

Kelly
I am going off track but I think the reason that you are looking for test equipment is just as interesting as a discussion about it.

Have to ask. You did disconnect your antenna before the storm.

The other day had the antennas off before a storm rolled in The leads were sitting on a grounded plate. Later could hear a ticking so I went in the shack and the antenna lead was sending half inch long sparks to ground.

The sparks were not from lightning per say but voltages were well above what I would expect most hf receivers would handle. They were not the million ampere discharge.

I don't believe that any "lightning arrestor" is worth much. Just a step above deer whistles.
Lightning is going to do what it is going to do.

Re: Look at this on eBay, ubitx, budget test equipment.

Tom, wb6b
 

On Sun, May 12, 2019 at 08:38 PM, Robert D. Bowers wrote:
3: Somewhere near the top, antenna testing gear is a necessity.
The previous suggestions look like good suggestions.

On the antenna testing front, one low cost possibility is to use a noise generator with a cheap SDR dongle (that can do HF frequencies) and a directional coupler to let the antenna mismatch from 50 ohms display as increased signal on the SDR.

Here are a couple of examples. The advantage of this particular "Reflection Bridge" is you can choose the impedance you want to be the proper match. For 50 ohms, just put a 50 ohm resistor on the reference port.

https://www.ebay.com/itm/ORIGINAL-RF-SWR-Reflection-Bridge-0-1-3000-MHZ-Antenna-Analyzer-VHF-UHF-VSWR/292083525131

https://www.ebay.com/itm/2018-new-version-noise-source-Simple-spectrum-external-tracking-source/111392810099

Tom, wb6b

Re: Dave West --PLEASE DELETE

 

I can see the photo Arv, an old gentleman with a violin!

At 13-05-19, you wrote:
Donald

Seems that the photo did not come through. Maybe a good thing...?

Arv

Re: Look at this on eBay, ubitx, budget test equipment.

Robert D. Bowers
 

Kelly, I would suggest this as a pattern of equipment purchases:

1: a good DVM.  There are good ones which won't break your wallet - and you would want as good as you can find.  I've seen them with all sorts of abilities, such as a (rather low bandwidth) frequency counter, transistor tester, and cap meter.  I've heard some horror stories about Chinese products, but I've used some of their stuff and have had no problems with it.  I use a fancy Radio Shack meter which has been adequate, accurate, and precise enough - and rugged.

(Equally important to a good meter - a good soldering iron.)

2: Look for a used scope, minimum 30mhz bandwidth.  Unless you have a lot of experience with them, stick to a used (but working) analog scope.  I've seen some pretty good deals at hamfests... working condition, for under $100.  The more you know, the more useful it can be!

3: Somewhere near the top, antenna testing gear is a necessity.  If you have soldering experience, I would suggest "rolling your own".  I could point out some inexpensive pieces that can be combined together as a very effective tool.  The Handbook has some good stuff in it, the Experimental Methods in RF design book is much better.  (I combine ideas from that with arduino, and have some really useful circuits, like a wide bandwidth and very sensitive dBm meter that reports signal strength to software or spreadsheet - more than a thousand times a second.)

4: Something that receives across the bands - a general coverage receiver of some sort is (IMO) almost a necessity on a decent bench - something with at least moderate shielding and can receive WWV and so on.  Along these lines, if you work with VHF or UHF, a decent SDR dongle is cheap and can be used for all sorts of things - like checking the deviation (and spurs) on a 2m rig.  I paid less than $30 for mine (NESDR Smart)... and there are some which are better and that can go down well into the HF range (mine stops around 27mhz). 

THEN I would recommend a signal generator.  (It could be combined with #3 to do some impressive work.)  I built my own unit by combining a DDS kit with a good attenuator salvaged from a burned signal generator.  You combine them together in a single case, and shield and ground everything, you can keep leakage to a minimum and have something really useful.  For instance... have a impedance bridge with an unknown ferrite toroid on one leg (with a single loop of wire through it)... drive the thing with the signal generator (programmed, using a computer to step it through a frequency range), and watch the output with the digitizing dBm meter.  Presto - you can with a little reading and math, figure out the characteristics of the toroid!  (Especially if you have a couple of known-value caps you can throw in the circuit...)

With those, you can get really creative.

Bob

N4FBZ

On 5/12/19 8:12 PM, Kelly Mabry wrote:
Hi Laurence, at the best case I can realistically squeeze about 50 bucks a month out of the budget starting June 2019.  That doent allow for much, I know. So for now I either must build or scrounge (I might can do area hamfests next year) (either Littlerock, AR or Memphis) thank God for my kia Soul! 

I was able to buy the ubitx due to the fact that mom wanted to hit the casinos in Mississippi,  just over the  state line. So I drove her, borrowed 20 bucks to keep from being bored and played slots...I hit for $205! Paid mom back, and ordered the ubitx the next day. As i had ordered the case from Sunil a few days before...and here I am...lol
Oh... yeah. $ 0.25/spin if you must know...Isle of Capri, Lula MS..hi hi.

73,

Kelly K5AID 

Re: Dave West --PLEASE DELETE

Donald <donwestpwl@...>
 

My apologies to all. Sorry about that.--Donald, KB5PWL

On 5/12/2019 10:13 PM, Vince Vielhaber wrote:
The pic of the gentleman sitting on a chair with a violin?  It came thru the email.

Vince.



On 05/12/2019 11:02 PM, Donald wrote:
Yes! I was emailing a photo of my great-grandfather to a nephew, and my
email program said it sent the photo to this group, too! I don't know
what happened, but I'm glad it didn't show up here.

On 5/12/2019 7:03 PM, Arv Evans wrote:
Donald

Seems that the photo did not come through.  Maybe a good thing...?

Arv
_._

Re: Dave West --PLEASE DELETE

Vince Vielhaber
 

The pic of the gentleman sitting on a chair with a violin? It came thru the email.

Vince.

On 05/12/2019 11:02 PM, Donald wrote:
Yes! I was emailing a photo of my great-grandfather to a nephew, and my
email program said it sent the photo to this group, too! I don't know
what happened, but I'm glad it didn't show up here.

On 5/12/2019 7:03 PM, Arv Evans wrote:
Donald

Seems that the photo did not come through. Maybe a good thing...?

Arv
_._