Search found 178 matches

by wa2t
25 Aug 2022, 14:58
Forum: General Information
Topic: replacing the knob
Replies: 5
Views: 441

Re: replacing the knob

Correct.

73,

Robert, WA2T
by wa2t
27 Jul 2022, 11:38
Forum: Troubleshooting
Topic: Iambic B on startup
Replies: 5
Views: 272

Re: Iambic B on startup

Thanks guys! Just got my first Keyer in decades as an incentive to get into CW. ("Back into" would be an exaggeration.) I was already questioning my sanity.... Yesterday I was doing ok?! Why does it not work today. Can't even send A and N in test mode :D -Tobias If you are using an extern...
by wa2t
27 Jul 2022, 11:36
Forum: General Information
Topic: Modifying a Cheap Baofeng Speaker Mic for (tr)uSDX Use
Replies: 18
Views: 3023

Re: Modifying a Cheap Baofeng Speaker Mic for (tr)uSDX Use

I have a question... Could a yaesu 3.5mm microspeaker work with a microphone and speaker splitter? Example: https://amzn.eu/d/8MPRsOS Thanks Compare the connections of that cable with the (tr)uSDX connectors: https://dl2man.de/4-trusdx-manual/ I would venture to say the answer is no. 73, Robert, WA2T
by wa2t
25 Jul 2022, 18:43
Forum: Troubleshooting
Topic: *Rxxxx* No Longer Supported Posting/Thread
Replies: 3
Views: 369

*Rxxxx* No Longer Supported Posting/Thread

Link in the posting is broken.
by wa2t
18 Jul 2022, 17:54
Forum: General Information
Topic: prusaprinters.org offline ? Where is the 3D files?
Replies: 2
Views: 192

Re: prusaprinters.org offline ? Where is the 3D files?

All the info you need is on Manuel's website for the (tr)uSDX. The link for the housing files is on the Group Buy sub-page: https://dl2man.de/1-trusdx-group-buy/
by wa2t
17 Jul 2022, 15:31
Forum: Troubleshooting
Topic: High SWR and Power - Bad transformers connections ?
Replies: 20
Views: 2094

Re: High SWR and Power - Bad transformers connections ?

So, then the "processor facing caps" are C7 & C8 on the RF board, yes? Correct. Interesting about C31 and C39 though, I had not looked for or even thought there were additional caps (connected to the same lines) beyond C7 and C8 on the RF board. Regardless, I think this (now) fully de...
by wa2t
16 Jul 2022, 16:21
Forum: Troubleshooting
Topic: High SWR and Power - Bad transformers connections ?
Replies: 20
Views: 2094

Re: High SWR and Power - Bad transformers connections ?

All parts concerned are on the RF board. As for what they do, they 1. Lower the impedance presented to the ATMEGA (reference the data sheet info I quoted) and 2. removal of the second cap stops the “charging” effect I noticed on problem units (values climbing over time).

73,

Robert, WA2T
by wa2t
16 Jul 2022, 16:18
Forum: General Information
Topic: QRP Labs 50W Amp
Replies: 2
Views: 341

Re: QRP Labs 50W Amp

As you probably know, that amp is intended for CW. I suspect that it would not work properly with the (tr)uSDX in SSB mode because, well, it’s SSB, albeit SSB generated in a novel way. To use that amp you’d probably need to change biasing to make tha amp linear (as Hans alludes to in the amp descrip...
by wa2t
14 Jul 2022, 20:34
Forum: Troubleshooting
Topic: High SWR and Power - Bad transformers connections ?
Replies: 20
Views: 2094

Re: High SWR and Power - Bad transformers connections ?

If you have the boards out of the case and add "the magic finger" to the components after the detector diodes, the problem goes away for as long as your finger is there, this has been my experience. In my opinion, there is a circuit problem in this area. I revised my units accordingly (com...
by wa2t
13 Jul 2022, 13:48
Forum: General Information
Topic: Question about IF Signal
Replies: 14
Views: 602

Re: Question about IF Signal

There is no IF, this is a direct conversion (to baseband IQ) receiver.
by wa2t
08 Jul 2022, 18:20
Forum: Troubleshooting
Topic: SSB TX sounds way off frequency
Replies: 16
Views: 871

Re: SSB TX sounds way off frequency

It's interesting that you had to decrease the frequency reference setting. Most radios I have seen online, and my own, needed to be increased by about 1 to 1.1 kHz. Just for experimentation, ignore the FT-891 band scope and set a reference frequency of 27001050. See if that improves your SSB audio....
by wa2t
02 Jul 2022, 15:22
Forum: General Information
Topic: More comprehensive Schematic by KD4SGE & WA4ITD
Replies: 6
Views: 1319

Re: More comprehensive Schematic by KD4SGE & WA4ITD

Glad to see this work endorsed, good job Manuel!

73,

Robert, WA2T
by wa2t
02 Jul 2022, 15:21
Forum: Troubleshooting
Topic: Problem connecting to external PA
Replies: 24
Views: 1310

Re: Problem connecting to external PA

FWIW, the PTT interface does work, I have connected the (tr)uSDX to my RF2K+ amplifier and it works fine.

73,

Robert, WA2T
by wa2t
28 Jun 2022, 13:40
Forum: Troubleshooting
Topic: Main board failure
Replies: 5
Views: 436

Re: Main board failure

In the absence of a thermal camera, a finger searching for heat is also quite effective.
by wa2t
26 Jun 2022, 19:00
Forum: Troubleshooting
Topic: Efficiency Hocus Pocus - out of ideas
Replies: 17
Views: 1022

Re: Efficiency Hocus Pocus - out of ideas

Hello All, I have spent two days working on my ASSEMBLED tr usdx from the authorized seller Uellyqh on ebay. I measured the current draw on receive and subtracted that from the transmit draw. I then measured the PP voltage with my tectronix scope. Did the math and got the RF out on all bands. Did m...
by wa2t
24 Jun 2022, 14:41
Forum: General Information
Topic: Modifying a Cheap Baofeng Speaker Mic for (tr)uSDX Use
Replies: 18
Views: 3023

Re: Modifying a Cheap Baofeng Speaker Mic for (tr)uSDX Use

Nice job Markus! Thank you.

73,

Robert, WA2T
by wa2t
23 Jun 2022, 19:05
Forum: Troubleshooting
Topic: No options on S meter or LPF after reset
Replies: 5
Views: 330

Re: No options on S meter or LPF after reset

Follow instructions on dl2man.de site.
by wa2t
23 Jun 2022, 16:47
Forum: Group Buys
Topic: Two Turnkey (tr)uSDX Transceivers for Sale
Replies: 1
Views: 563

Re: Two Turnkey (tr)uSDX Transceivers for Sale

These were quickly sold, thanks. Just updating the thread.
by wa2t
23 Jun 2022, 16:37
Forum: General Information
Topic: (tr)uSDX - Alternative Band Setups available
Replies: 87
Views: 13933

Re: (tr)uSDX - Alternative Band Setups available

Before too much work goes in to fine-tuning these values, would it be possible to re-arrange the filter numbering so that bands shared between configurations use the same spots? Something like this: Proposed (!!) Assignment K1 K2 K3 K4 K5 Lo (current Standard) 20m 30m 40m 60m 80m Hi (Only Hi Bands)...
by wa2t
19 Jun 2022, 13:22
Forum: Troubleshooting
Topic: FWD Power / SWR-Meter not showing up
Replies: 4
Views: 332

Re: FWD Power / SWR-Meter not showing up

Correct, the meter only shows in CW mode. Would be nice if the meter worked in all modes but (guessing) maybe available code space constrains what can be done.

73,

Robert, WA2T
by wa2t
18 Jun 2022, 22:24
Forum: General Information
Topic: No U2 on OLED Display
Replies: 4
Views: 330

Re: No U2 on OLED Display

Yes.
by wa2t
17 Jun 2022, 21:30
Forum: Troubleshooting
Topic: Matching Bs 170 jfets
Replies: 8
Views: 435

Re: Matching Bs 170 jfets

Good info Owen.
by wa2t
17 Jun 2022, 18:09
Forum: General Information
Topic: Case OK for hot car?
Replies: 3
Views: 578

Re: Case OK for hot car?

In a hot car, ABS would probably be best, but it is not as easy to print, has odor when printing, etc.
by wa2t
17 Jun 2022, 17:59
Forum: Troubleshooting
Topic: Matching Bs 170 jfets
Replies: 8
Views: 435

Re: Matching Bs 170 jfets

The Gate Threshold voltage on the data sheet I looked at (OnSemi) says 2.1V typical. So, that would be around where to start while looking at RDS. Settle on a VGS that gives meaningful RDS values and then test all the devices you have for RDS at that same VGS.