Frankly, saving a few dollars by not buying a proper flux cleaning agent is not worth the trouble. Small amounts of toothpaste, water and whatever may become...
68269
Parks, Tony
kb9yig
Sep 2, 2012 11:29 am
Good Morning All, There has been enough interest expressed for me to move ahead with the add on circuit board for LF operation of the RXTX Ensemble...
68270
tinusrammstein
Sep 2, 2012 11:31 am
Hi Ulo, I ordered a new u4 - LTV 817 optocoupler.. This is what is meusure on R5 and R6 ... R5 - 1-7mhz - 0.37V R5 - 8-24mhz - 4.74V R6 - 1-7mhz - 4.89V R6 -...
68271
softrock40 moderator
softrock40
Sep 2, 2012 12:37 pm
68272
softrock40 moderator
softrock40
Sep 2, 2012 12:37 pm
68273
softrock40 moderator
softrock40
Sep 2, 2012 12:39 pm
68274
Kenneth Hardy
kenahardy
Sep 2, 2012 1:11 pm
 Tony I would jump at the chance to build a 500khz board - this band becomes available in the UK soon and as an ex marine op I would love to work the band...
68275
k1tli
Sep 2, 2012 2:07 pm
Alan, I put the jumper back in and here are the results on testing U10: Pins 2 & 14 measured 2.5 volts Pin 16 measured 5.0 volts so the 5 volt rail is intact ...
68276
mkatz_08852
Sep 2, 2012 2:21 pm
Hey guys On the subject of jumpers, I admit to a bit of confusion topped off by some paranoia. I have a Vista machine and will be using WinRadHD. Do I cross...
68277
R. R. (Robby) Robson
wb5rvz
Sep 2, 2012 2:32 pm
There is a grounded via that is very close to pin 3 of U10. It is actually beneath the IC, but excess solder on pin 3 might have made a "whisker" contact with...
68278
ylo58
Sep 2, 2012 2:35 pm
OK. I had in mind making sure that R5 actually is about 2.2 kOhm and not drastically less, for example 22 Ohm. This can be done with an ohmmeter in unpowered...
68279
k1tli
Sep 2, 2012 2:49 pm
I have been over the soldering and all looks fine. No shorts to ground that should not be there and no shorts to other pins. Pins 3& 6 measure 1.345k to gnd...
68280
Zack Widup
w9sz
Sep 2, 2012 2:57 pm
I've been using MEK and Q-tips. I know there are a lot of safer chemicals around but I use it in a well-ventilated area. It seems to be safe on all non-plastic...
68281
Jerry Kaidor
jerry@tr2.com
Sep 2, 2012 3:56 pm
... *** I use Isopropyl alcohol. The strong kind that they sell at the paint stores. Anhydrous ( no water ). Cleans well, evaporates completely, doesn't...
68282
KQ8M
Sep 2, 2012 4:03 pm
I use Puretronics Flux Remover. Does the trick for me. I also use a toothbrush with it but most of the time I don't even need that. 73, Tim Herrick, KQ8M ...
68283
eject12
Sep 2, 2012 4:11 pm
I have RXTX Ensemble and a Lite II 80m and 40m receiver for sale. Will take $75 for the RXTX and $18 each for the receivers. All three kits have been assembled...
68284
Ronald Wagner
ronaldclarkw...
Sep 2, 2012 6:00 pm
Apparently the strong kind is not available in California. Ron - ki6fhb From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On Behalf Of Jerry...
68285
Jerry Kaidor
jerry@tr2.com
Sep 2, 2012 6:37 pm
... *** Um, I think it is. I'll go down and check my can.... The description reads: Denatured Alcohol High grade fuel for alcohol burning chafing dishes and...
68286
tinusrammstein
Sep 2, 2012 7:33 pm
Hi, Ulo I unpowered the softrock and meusured the following values.. R5 = 2.16K Ohm R6 = 2.16K Ohm R12 = 10.53K Ohm R13 = 10.53K Ohm 73, Martijn...
68287
ylo58
Sep 2, 2012 9:51 pm
Hi Martijn, this confirms that R5 is fine and can not have caused the failure. When removing the defective optocoupler, you can cut off the pins and remove the...
68288
Matt Maguire
matt_vk2acl
Sep 3, 2012 5:38 am
I'd be looking closely for solder bridges around R28, R29 and U10 pins 1, 2, 14 & 15, which may cause R28 to be shorted when installing the "QSD /EN" jumper....
68289
nt8noxo
Sep 3, 2012 5:58 am
I am building the RXTX and in the LO building phase. I have installed the drivers and CFGRS software. The software sees the board and comes up. But there is no...
68290
mtnredhed
Sep 3, 2012 7:21 am
I think you'll find that's ethanol you have. The problem with isopro is that if you buy 99%, (and I just saw it in a NorCal Fry's) it will absorb water vapor...
68291
Mike Thompson
c6anx
Sep 3, 2012 7:36 am
would you be kind enough to close the sending of emails to me of the softrock project.....until further notice Thanks for your attention....
68292
Alan
alanzfq
Sep 3, 2012 7:42 am
... Subject: [softrock40] Ensemble rxtx si570 problem ... Randy, This is usually due to pins 7/8 on the Si570 not being soldered, or maybe too much solder. ...
68293
mkatz_08852
Sep 3, 2012 8:51 am
I found the build notes a bit confusing concerning the jumpers I have a Vista machine and will be using WinRadHD I have a soundblaster USB on the way Should I...
68294
Alan
alanzfq
Sep 3, 2012 9:13 am
... Subject: [softrock40] Jumper config in RX op-amp phase ... Marc, Probably the best advice is that you make it possible to alter them as required. That's...
68295
la3jj
Sep 3, 2012 9:19 am
Hi all, No problem this time, just like to tell that I have uploaded a screenshot from my wspr test on 20m to the LA3JJ folder in the Photos section. With the...
68296
Marc Katz
mkatz_08852
Sep 3, 2012 12:03 pm
Alan, Â That makes a great deal of sense. How about making a switch box to cover all the possibilities? Just a thought. Â I will do as you suggest. Â Marc,...
68297
tom
wa1vta01452
Sep 3, 2012 12:44 pm
Send an email to softrock40-unsubscribe@yahoogroups.com ... From: Mike Thompson To: softrock40@yahoogroups.com Sent: Monday, September 03, 2012 3:36 AM ...
