The fact that it turned out it won't work has been frustrating, and I'm hoping the F3 replacement will get me back on track. Bob KO2F Bob--how many different versions of P2 did you try? If you only tried v12 and it didn't run, then fixing F3 is the least of your ...

Hi all, Could someone post a picture where the F3 PTC on the Angelia Board is (for a 100D) please? The only F3 (2amp) fuse I can see on the schematic ...

... the 100D specifically to use with Protocol 2 and Thetis. The fact that it turned out it won't work has been frustrating, and I'm hoping the F3 replacement will get me back on track. Bob KO2F

Hi all,

Could someone post a picture where the F3 PTC on the Angelia Board is (for a 100D) please?

The only F3 (2amp) fuse I can see on the schematic is circled in the below photo. Just wanting to make sure I replace the right one.

Hi Bob,

I actually never got around to modifying my 100D, so I can't really say. I've been concentrating on my 8000DLE.

73,

Scott

Hi Scott,

Did you get around to change the F3 fuse in your Angelia?

Did it resolve the apparent lockup problem?

Have there been adverse effects?

Bob
KO2F

I don't have a photo, but if you orient the Angelia card so that the ATX power connector is at the bottom left, then you will find F3 just above the right end of the power connector and to the left of the group of jumpers. It should be clearly marked on the silk screen. By the way, this ...

Where can I find a picture to locate the fuse on my Angelia board?

Bob
KO2F

Sounds like it could be the PTC ("fuse") overheat issue.

... so feedback will be important. If you have not replaced or shorted the F3 PTC device and observe sudden stoppages or crashes that are only recoverable by power cycling ...

... actually tried P2, so far there has only been a single report of an F3 PTC overload (on a Hermes), which is very promising. Doug has also made huge strides with Thetis ...

... with increased temperatures due to the very tight margins on the "F3" PTC (reset-able fuse) on the 3V supply to the FPGA. If everything works great at first and ...

I'm going to suggest it is too early to start panicking over F3 issues. Let's see how this newest firmware performs on a larger sample of ... here to peruse: https://apache-labs.com/community/search.php?keywords=f3+ptc . Experience suggests it is not an issue for cooling or the PSU. The firmware ...

... of the FPGA to increase. On these SDR cards, overheating of the "F3" positive temperature coefficient (PTC) device which protects the 3.3V supply has been reported, with resulting erratic operation ...

... with P2 is that it causes the power consumption of the FPGA on the Hermes (14 and 16 bit versions) and Angelia cards to exceed the rating of the PTC device which protects the 3V supply. Read more here https://apache-labs.com/community/viewtopic.php?f=17&t=2777 and here https://apache-labs.com/community/viewtopic.php?f=17&t=2354&p=2604 ...

As far as I know, only one person has modified their Angelia and they used a small bit of wire. When I get the part I just ordered (see above) I am going to try that.

Hi Scott, A quick 'back' on my anan100D#1 from V2 to V1 this morning show No sign of osc instability either on warm-up nor (after 1 hour) on regular basis. I am not very familiar with the features of this forum but can send measurement pictures to you. I'll do the same measurement on my 100D#2 later...

Couldn't say for sure, Jean-Marc. I don't know what a "clock restart" is. The only PTC that's been identified that might work is the 1210L450SLWR identified above. As far as I know, nobody has tried it yet. However, thanks for reminding me, I'm going to order ...

Hi, On two anan100D (angelia) running protocol V2 and thus Thetis, I am seeing the following issue and wonder if this could be related to the 'fuse' issue described here : - tests conditions are two anan100D, one from the early batches (rev16, low perf 10MHz tcxo) and an upgraded one (rev24, CWT817 ...

Nope, the Orion and the Orion MkII are supposedly good to go. I hope!

73!

Scott

You know, sometimes I wonder if getting older is better than the alternative... sorry for that. I was focusing on the "non-availability" of the current part rather than the obvious problem that you needed more hold current. I'll keep looking around. Does this affect the Orion MKII boards a...

Hi Joe,

That's the same part I identified up above, and since it's a direct replacement it's unfortunately not applicable to the problem, which is calling for a part with a much higher trip current.

Thanks & 73,

Scott

This should work...

Mouser # 530-0ZCG0300FF2B
Mfr. # 0ZCG0300FF2B

Currently showing 6000+ can ship immediately.

Same part number as original except the 4th letter being a G rather than a C. Unless I've missed something, I see very little difference in the two items.

73,

Joe W4WT

I got a suggestion from the old Yahoo group to go one size smaller, to a 1210 size part. Littlefuse makes a 4.5A PTC, part no. 1210L450SL. If I can get someone to give me a good current measurement I may go with that. It's less than 1mm shy of the pad on each side, easily bridgeable with solder.

That's unfortunate Scott, but you would certainly not be the only one who did that. When I was researching this potential problem with my Hermes - ANAN-100 several users of the ANAN and the original TAPR versions of Hermes said that they went with the wire jumper and never gave it another thought. I...

... 2 firmware are in excess of that reliably delivered through the 3.3V PTC ("fuse"), F3. According to the Angelia bill-of-materials (BOM) published on the Apache web site, F3 is ...

... to replace or bypass one of the on-board circuit protection devices (a PTC type self resetting fuse) on the 3.3V supply rail. On Angelia that would be F3. It seems that an FPGA pulls a bit more current running P2 firmware and causes the PTC ...

... sends a proportional voltage to the ATmega board (ADC2 input), depending on the temperature sensor (as far as I can judge R38,probably a NTC or PTC resistor). The fan is the driven by a PWM stobe sent by the PD5 ouput of the ATmega, buffered by a N-Mosfet. Which one is in use in the rig ? (or ...

... to guess. However, if you think it is thermally related, there are 3 PTC type resettable fuses on the board, F1, F2, and F3. You could check those. If you thermally damaged a chip then it could be hard to find. Good ...