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Recent Posts

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91
Morse Code / Re: Learn How To Increase Your Morse Code Copy Speed.
« Last post by gil on August 31, 2018, 05:38:35 AM »
Good one Sparks, thanks.
Gil.
92
Morse Code / Someone's Blogpost about Learning Morse Code
« Last post by RadioRay on August 29, 2018, 12:08:53 AM »
Gil has written about it, I have, others have.  Here is another fellow and he really did a good deed by writing of his recent learning of Morse code.

http://fine.business/ham-radio/2015/12/20/learning-morse-code
93
Morse Code / Re: Learn How To Increase Your Morse Code Copy Speed.
« Last post by Sparks on August 28, 2018, 08:13:11 PM »
I downloaded the app "Morse Machine" by IU4APC …

https://alphapapacharlie.com/2015/01/26/morse-machine/

Seems it is, alas, only available for Android devices. Even if an iOS version is promised in a reply to a 2015 comment.
94
Morse Code / Re: Can Morse Code Still Save You?
« Last post by RadioRay on August 28, 2018, 05:18:47 PM »
Thanks for postin over there, Gil.  It's a thought provoking article.  The Answer (tm) isn't always to pullout the credit card to buy a solution. A more reasoned , focused, minimalist approach is usually the best solution for when we are outside of the ham shack.


73 de Ray  ..._  ._
95
Morse Code / Re: Can Morse Code Still Save You?
« Last post by caulktel on August 28, 2018, 03:07:19 PM »
Great article Gil, sure sparked a lot of opinions but that's great if it gets people thinking.

Joel
N6ALT
96
Stan,

Sorry, I meant to direct you to http://ubitx.net/ for more info regarding the uBitx problem. Farhan's rebuttal is there. Personally I don't think this is as big a problem as some individuals are trying to make us believe. I still use mine everyday.

Joel
N6ALT
97
Hi Stan,

I am aware about insulating the IRF510's from ground, I have done this on all 5 of my Bitx builds.

 As far as the harmonic/spur problems of the uBitx are concerned, its far too complicated for me to explain, and due to the fact that no two people can agree to anything on that group, it muddys  the water even further. Suffice it to say, something needs to be done and I'm waiting to see what Farhan comes up with, he always seem to find a simple solution to problems as opposed to these people that want to start from scratch and completely redesign the radio.

Joel
N6ALT
98
Don't know if any of you have been following the debacle going on over at the bitx20.io group regarding the uBitx, but those few fortunate people who have quality Spectrum Analyzers and know how to use them, have found that the uBitx 'mostly' does not pass FCC specs, (US), for spectral purity, (some nasty spurs). Some are advising not to use them on the air until some kind of fix is figured out. Funny I have been using mine every since they came out and nobody has knocked at my door yet, but I don't want them to either. All of the EE's on the group are seeking to redesign the uBitx to meet specs. I find this whole thing to be rather disheartening after all the time and effort I put into my two radios. They are talking about cutting the traces going to the LPF section and adding a daughter board with a new LPF design to fixed the existing boards. Not quite sure what to do but wait and see what everybody comes up with. :( :-[ :-\

Joel
N6ALT

I own a µBitX but I'am not a subscriber of this group. Did they say anything about the frequencies of those spurs ? Are they over 30 MHz  ? In this case, an external third order LPF (at the cost of a few dB of power loss) might do the job...

73's, Stan.
99
I ordered another uBitx, it should be here in a few days. It will be the V4 board with some improvements incorporated into the new PCB. I will be using a 3.2 inch Nextion touch screen display on this one.
I'm going to make numerous case improvements to this one, like bolting the finals to the case for better heat dispersion. Gil, you wont like this one because it's going to have a higher idle current draw than the previous one, but it isn't intended for portable use.
I look forward to starting work on it. Ill post my progress.

Joel
N6ALT

Be careful with the finals. If I recall well, the IRF510's back is connected to the drain, which is not "groundable". If you want to bolt them to the case, don't forget to use TO220 insulation kits  ;)


73's, Stan.
100
Military Radios / Re: Czech Military RF-10 Radio.
« Last post by W5IJH-Jeff on August 28, 2018, 07:41:27 AM »
The battery was shot when I received the radio (no surprise) Bought a Duracell Ultra SLAB 6vdc 3.3Ah. Unsoldered the positive and negative wires to battery holder and gutted the battery box. As a note, there are 2 little C-clips holding the positive and negative terminals in place. Remove those and push the terminals up through the plastic cell holder. I just crimped and soldered on F1 spade lugs. I centered the SLAB in the battery box and used 2 pieces of foam to hold the battery in place. I carefully connected the battery lid onto the battery box and installed the unit onto the radio. It powered on and I ran through a functional check before trying to make a contact. Set frequency to 52.025MHz and made contact with a friend who was waiting. Audio was surprisingly good. Distance was about 1 mile.  I have a fondness for "Greenies" even though modern stuff is better and more compact. I've been pretty impressed with this little radio despite it's limitations and functionality. In fact, I bought a PRC-351 which will arrive next week. This should be fun!
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