Gentlemen, I'm having problems winding T1. I'm struggling to wind the secondary bifilar and am 3 turns less than a full set. That's 85 T primary 48 T secondary...
Dear Tony OK I'm really lost now. Carefully checked all component values and soldering of T1 leads - all seems OK. Checked all leads and for solder bridges...
Hi Norman, How do the signals look on C11 and C13 with reference to circuit ground when you have an RF input to the antenna terminals? 73, Tony KB9YIG ... ...
Hi, The "motherboard" FST3253 switched Rx and Tx BPF with PA for use with SR v6.3 is in Beta Testing. Please see message # 27425, #27460 and #28214 in the...
... than a full set. ... Nice to see someone else having that problem. I used cesco's advice and used a FT37-43 core 35T primary, 20T secondary. good...
... Paul: After consultation with Jan G0BBL, I have modified the tests for the USB Control stage in the V9.0 RX. You might want to take a look at/try them. ...
Hi Tony Thanks for coming back so fast This is a 6.0 board so I assume you mean C12 and C13, the two 0.047 uF decouplers? With my scope AC coupled and on its...
Thanks Gerald, I obviously asked the wrong question when searching the archives. FT37-43 core on order 73 Clive G8POC ... From: "Gerald" <cow2toxic@...>...
The reason is that the Softrock40 group no longer has an owner. It's running on autopilot until it dies. Whoever was the owner that set it up no longer...
I checked the new tests ... the hairpin on R1 should have about 90 mVdc on it. I get ZERO on it. Should I proceed with the other checks? thanks, Paul K0ZYV...
The voltage at the hairpin of R1 will be present if the USB cable is connected to the board and plugged into a USB socket. 73, Tony KB9YIG ... From: wnpauls ...
Greetings Group and Happy Holidays! Over the course of Saturday afternoon/evening and the same on Sunday I was able to complete the V9.0 main board and 5 of...
Hi Norman, Please repeat the DC gain test for the dual op-amp. A 10k resistor to ground at pin 2 or pin 6 should result in a voltage change of 1.25 volts at...
I have removed U5 on a Lite+Xtall v8.0 receiver, cut a couple of traces, and rewired U6 to be like the V8.3 receiver. The reciever still works(!), but I don't...
... Hi Dan, I'm all for synchronous clocking, but honestly I didn't see any measurable improvement. For new designs I would choose synchronous design...
Hi Tony pin 1 goes from 2.49 to 3.73V with 10K at pin 2 pin 7 goes from 2.49 to 3.89 with 10K at pin 6 Norman ... to ground at pin 2 or pin 6 should result in...
I think that we should move to a forum structure. Important threads and information are much more accessible. The mailing list format is outdated and makes it...
Paul, I had a similar problem and found pin 4 (grd) was a cold solder joint. One of the problem using a low wattage iron, is the ground plane is a big heat...
... Only if it's still accessible via a mailing list. I find forums pretty much impenetrable. I'm on two, and that's about as much as I have time to deal...
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Art
KY1K@...
Dec 1, 2008 5:35 pm
Hi all, Just a short note to update those interested in Alex's Motherboard FST3253 project. Beta kits have been sold out. There are 10 users who will be...
Hi Norman, The DC gain of each of op-amp is about right. When you checked for the AC I and Q outputs was it at pins 1 and 7 of the dual op-amp each with...
In message <49341927.2000306@...>, Gordon JC Pearce MM3YEQ <gordon@...> writes ... Or be fortunate enough to have e-mail software that treats mailing...
... helped. ... Hi Dan, The synchronus clocks maintain timing relationships at the higher operating frequencies [ie 20M up] where other chip parameters like ...
Hi Tony There is a fine strong signal on pin 7 and on the output side of the capacitor. There is no signal at all on pin 1 or on the output lead. All measured...
Hi Norman, With DC gain of each op-amp about right, it seems that R9 has a larger resistance than 10 ohms, or C14 has more capacitance than 220 pF, or there is...
Tony, Yes, I had it (USB) plugged in and I got all the correct voltages EXCEPT on the hairpin of R1. (Zero volts on R1). Paul ... connected to the board and...
Thanks Tony. It all checks out visually so I'll take out the capacitors tomorrow and see what happens. I'll probably order up a new U5 just in case. Our local...
