646
Huh? / Re: Anyone else...?
« on: November 05, 2015, 0707 UTC »
Yes! And Roxy out on Video too......at Last!
Shortwave Pirate Radio In North America And Around The World, And Other Signals That Go Bump In The Night
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Modified pricing on my 10W 6925KHz TX's.
$200
Complete, Tested, Boxed, Bargain!
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647
The RF Workbench / Re: LTC1799
« on: November 03, 2015, 1221 UTC »
Ah.. There is life out there!
Thanks for the reply BTW.
Sure I've got DDS's and prefer the Si570 (still waiting for my 'Friend' to program them) but was looking for something really simple to offer with my kits.
Will check out your schematic when I get home (blocked at work and my phone wont download the link?)
Looks like your're busy over there in .nl.
Nice!
Cheers from T' Norvern UK.
Thanks for the reply BTW.
Sure I've got DDS's and prefer the Si570 (still waiting for my 'Friend' to program them) but was looking for something really simple to offer with my kits.
Will check out your schematic when I get home (blocked at work and my phone wont download the link?)
Looks like your're busy over there in .nl.
Nice!
Cheers from T' Norvern UK.
648
The RF Workbench / LTC1799
« on: October 31, 2015, 1600 UTC »
Anyone used one as a VXO?
I'm thinking of offering them as an option on my LuLu's.
Seem stable enough?
Stretchy.
I'm thinking of offering them as an option on my LuLu's.
Seem stable enough?
Stretchy.
649
The RF Workbench / Re: Trying A Different Approach
« on: October 29, 2015, 0723 UTC »
Hmm, Yes Loops are OK, but for MW the minimum diameter for decent efficiency on 1.5MHz is over 24' with a circumference of 80'.
That's with 2' tubing.
Your B/W will be less than 1KHz, so.....
Good luck with that!
Would be a good antenna (and a more manageable size) for the more 'usual' frequencies.
I'm sticking with my top loaded T.
Worked for Marconi!
That's with 2' tubing.
Your B/W will be less than 1KHz, so.....
Good luck with that!
Would be a good antenna (and a more manageable size) for the more 'usual' frequencies.
I'm sticking with my top loaded T.
Worked for Marconi!
650
Equipment / Re: [Swlfest] World?s first all-digital radio on a chip
« on: October 28, 2015, 1411 UTC »
Bit of an old post but to answer the final question;
Si4734 (and family) used in ALL the TECSUN et al radios BTW.
3x3mm is small enough!
Si4734 (and family) used in ALL the TECSUN et al radios BTW.
3x3mm is small enough!
651
The RF Workbench / Re: Trying A Different Approach
« on: October 28, 2015, 0817 UTC »
Top loaded T is your best bet.
Does need a good ground but all LF antennas will (you can used raised radials)
Just get as much vertical as you can, load the top symmetrically with horizontal wire(s)
Check where its resonant and just base load to get it where you want.
I'll be having a go on M.W. soon and will be using this style of antenna.
Check;
http://qsl.net/ei7ba/low_band_antennae.htm
Str.
Does need a good ground but all LF antennas will (you can used raised radials)
Just get as much vertical as you can, load the top symmetrically with horizontal wire(s)
Check where its resonant and just base load to get it where you want.
I'll be having a go on M.W. soon and will be using this style of antenna.
Check;
http://qsl.net/ei7ba/low_band_antennae.htm
Str.
652
For Sale / Wanted / Barter / LuLu Style Tx's 10W carrier, 40W Peak, with Modulator, Mod Tranny + 6925 XTAL
« on: October 28, 2015, 0724 UTC » Modified pricing on my 10W 6925KHz TX's.$200
Complete, Tested, Boxed, Bargain!
653
The RF Workbench / Re: LULU kits are available on EBAY
« on: October 28, 2015, 0718 UTC »
HI there, Stretchy here, I have found where you’re all hiding at last!!
OK, yes tis I who’s been selling the LuLu kits on FleaBay and the odd PWM modulator.
A little history, past and present………….
I’ve been into building RF circuits for over 40 years but only in the past 10 have I got fully up to speed and I’m now a self-employed RF Test engineer, have my own company in the U.K. and do this RF stuff for fun; have a fully functioning lab to 6GHz but much prefer to piddle around with stuff that’s useful and easily reproducibly with the minimum of fuss.
OK, having read thru’ the previous comments I just want to be clear on what I can build / supply etc as there seems to be some confusion!
I am currently selling a nearly fully built kit which will ONLY require the addition of a XTAL, it’s loading caps (22-47pF?) and a trimmer (22or47pF).
The ‘LuLu’ esq design is class E and therefore reasonably efficient (80% if using 12V) and will give 10W of carrier power (can be used as a C.W. TX) and will modulate to 4 times this (approx. 40W if using ‘Conventional’ modulation tranny techniques).
So that’s 40W from a design no bigger than your thumb!
Having a PCB means just plonking the bits on and soldering up, no thought required, well a few coils need winding if you are building it yourself but I think this is the fun part.
Yes it’s small, all parts are thru’ hole but if you prefer SMT there are pads on there too, just use a magnifier, I do!
I can supply the mod tranny core but don’t really want to wind the tranny for you (such fun!) but can if you REALLY want me to (would be part of a fully built and tested TX) and I don’t build any modulators as there’s no need to as they’re available from CHINA for cheap, again can supply but ONLY as part of a fully built and tested system..
The modulators (class D amps) are bomb proof and just turn off if upset and have not blown one up. These are infinitely better than the ‘TDA’ things of old. They will push out 20W@12V so ideal in this design.
As a complete transmitter solution there is NO other design out there that is as simple or as efficient.
I’ve also got loads of other designs but they’re not ready to release yet.
A, PiC driven DDS board (for those $5 DDS boards from China); 2 banks of 16Ch accessed via HEX sw, will be (eventually) user programmable but first release will have the 16 frequencies pre-programmed. I can’t write software and have had so many people say they could do this for me and 2 years on I’m still waiting for my latest ‘friend’ to produce something!
B, Push pull Class E, with PWM on a single PCB, have some early boards done and they work well giving 30W@12Vand 120W@24V. Still needs some work tho’.
C, 8 Cree Sic 3rd generation FET class E amp with 8 drivers, should achieve 2KW+at 120V, bit scary so keeping that one on the back burner for a while.
D, MiNi PWM for any transmitter, half the size of my last board with a single FET for 200W max any voltage from 10V to 50V.
For you folk stuck with 12V, there’s many a Voltage booster on Ebay, just get a decent 150W one to boost the 12V to 24V, $3.56 when I last looked (27/10/15)
The voltage boosted PWM thing may seem complete overkill and overly complex but both PCB’s are about the same size as Class D amp (modulator) and altho’ you still need a filter on the O/P of the PWM it’s small, doesn’t get hot or give any frequency related problems or weigh a ton (remind you of something!). Oh and you can modulate the carrier to ANY level, so 150% not a problem.
OK, that’s my rant over for now!
I’ve got a new batch of LuLu style PCB’s just in so if you want one contact me on here and you will get a decent discount.
I want to hear these things on the air, not roasting a dummy load in my lab!!
Please let me know if you want a full kit, or built.
Don’t forget you will have to supply your own Xtal.
I can’t really sell a fully working transmitter as that would be illegal!!
Please free to ask any questions
Regards from the U.K.
Stretchy
P.S. Have attached a pic of the top layer. I've left plenty of options for the Oscillator, Xtal/Ceramic wi/wo VXO option.
I don't think they're particular difficult to build, if you can solder, you can build it. It's masked so you can't short out adjacent pins.
OK, yes tis I who’s been selling the LuLu kits on FleaBay and the odd PWM modulator.
A little history, past and present………….
I’ve been into building RF circuits for over 40 years but only in the past 10 have I got fully up to speed and I’m now a self-employed RF Test engineer, have my own company in the U.K. and do this RF stuff for fun; have a fully functioning lab to 6GHz but much prefer to piddle around with stuff that’s useful and easily reproducibly with the minimum of fuss.
OK, having read thru’ the previous comments I just want to be clear on what I can build / supply etc as there seems to be some confusion!
I am currently selling a nearly fully built kit which will ONLY require the addition of a XTAL, it’s loading caps (22-47pF?) and a trimmer (22or47pF).
The ‘LuLu’ esq design is class E and therefore reasonably efficient (80% if using 12V) and will give 10W of carrier power (can be used as a C.W. TX) and will modulate to 4 times this (approx. 40W if using ‘Conventional’ modulation tranny techniques).
So that’s 40W from a design no bigger than your thumb!
Having a PCB means just plonking the bits on and soldering up, no thought required, well a few coils need winding if you are building it yourself but I think this is the fun part.
Yes it’s small, all parts are thru’ hole but if you prefer SMT there are pads on there too, just use a magnifier, I do!
I can supply the mod tranny core but don’t really want to wind the tranny for you (such fun!) but can if you REALLY want me to (would be part of a fully built and tested TX) and I don’t build any modulators as there’s no need to as they’re available from CHINA for cheap, again can supply but ONLY as part of a fully built and tested system..
The modulators (class D amps) are bomb proof and just turn off if upset and have not blown one up. These are infinitely better than the ‘TDA’ things of old. They will push out 20W@12V so ideal in this design.
As a complete transmitter solution there is NO other design out there that is as simple or as efficient.
I’ve also got loads of other designs but they’re not ready to release yet.
A, PiC driven DDS board (for those $5 DDS boards from China); 2 banks of 16Ch accessed via HEX sw, will be (eventually) user programmable but first release will have the 16 frequencies pre-programmed. I can’t write software and have had so many people say they could do this for me and 2 years on I’m still waiting for my latest ‘friend’ to produce something!
B, Push pull Class E, with PWM on a single PCB, have some early boards done and they work well giving 30W@12Vand 120W@24V. Still needs some work tho’.
C, 8 Cree Sic 3rd generation FET class E amp with 8 drivers, should achieve 2KW+at 120V, bit scary so keeping that one on the back burner for a while.
D, MiNi PWM for any transmitter, half the size of my last board with a single FET for 200W max any voltage from 10V to 50V.
For you folk stuck with 12V, there’s many a Voltage booster on Ebay, just get a decent 150W one to boost the 12V to 24V, $3.56 when I last looked (27/10/15)
The voltage boosted PWM thing may seem complete overkill and overly complex but both PCB’s are about the same size as Class D amp (modulator) and altho’ you still need a filter on the O/P of the PWM it’s small, doesn’t get hot or give any frequency related problems or weigh a ton (remind you of something!). Oh and you can modulate the carrier to ANY level, so 150% not a problem.
OK, that’s my rant over for now!
I’ve got a new batch of LuLu style PCB’s just in so if you want one contact me on here and you will get a decent discount.
I want to hear these things on the air, not roasting a dummy load in my lab!!
Please let me know if you want a full kit, or built.
Don’t forget you will have to supply your own Xtal.
I can’t really sell a fully working transmitter as that would be illegal!!
Please free to ask any questions
Regards from the U.K.
Stretchy
P.S. Have attached a pic of the top layer. I've left plenty of options for the Oscillator, Xtal/Ceramic wi/wo VXO option.
I don't think they're particular difficult to build, if you can solder, you can build it. It's masked so you can't short out adjacent pins.
654
For Sale / Wanted / Barter / Re: Transmitter
« on: October 28, 2015, 0712 UTC »
Hi, please check the post;
LULU kits are available on EBAY, Item; 131595757554
Stretchy.
LULU kits are available on EBAY, Item; 131595757554
Stretchy.