Re: Fw: LF: 475kHz crystal

[M0FMT <m0fmt@yahoo.co.uk>]

OK Dimitrios 

 

I understand about call-signs in PIC HEX code but what I have managed in the passed is to do is to identify the call and locator info with in the code in the ROM and alter it to mine if it is using ASCII. Any way I will cross that bridge later with your help may be but I should start to compile my own code rather than play with other peoples.

 

OK on you mixing old and new technology. I tend to try and maintain originality but its difficult so I often use say a LED and an RF indicator in my rigs in place of the usual and larger Neon and of course and silicon diodes if I need a bit of DC off the heater supply to operated the key (electo-mech) relays and electret mics. So my stuff is not pure retro there probably is a limit to how far you can maintain this philosophy sensibly.

 

Once again thanks for the info cheers.

73 es GL Pete M0FMT IO91UX

From: Dimitrios Tsifakis <dtsifakis@gmail.com>
To: rsgb_lf_group@blacksheep.org
Sent: Tuesday, 8 January 2013, 1:11
Subject: Re: Fw: LF: 475kHz crystal

Hi Pete,

the problem with a .hex file is that it will contain my callsign, not
yours! You will need to compile your own, however, if that's what
stops you from making a transmitter or a general purpose QRSS3 keyer
like this, I could program a 12F675 pic with your details and send it
to you. Or, if you have a pic programmer, I could compile the code and
produce a .hex with your call. Or, I can just send you the code and
you can modify it to suit your needs :-) Let me know.

It's funny, my 807 transmitter combines "hollow state" technology,
microcontrollers (keyer) and DDS (VFO) :-) Oh, I use an IRF720 to key
the 807 (cathode keying is tricky), I think I could eeeasily get 20 W
out of the IRF720 in class D/E. But that wouldn't be fun!


73, Dimitris VK1SV


2013/1/8 M0FMT <m0fmt@yahoo.co.uk>:
> Thanks for the info Dimitrios.
>
> Please let the list know when you have got something with that rig design it
> sounds good. I hope you will publish the HEX code for the PIC as I can
> program the chips so long as I have it. Its my biggest gripe that PIC
> projects leave you high and dry without the HEX code.
>
> However I like the idea of the little rig. I will get an e bay xtal as well
> .... great stuff!!
>
> Here I have a series of tube QRP rigs 160/80 CW AM FM FSK xtal/VFO and a
> 10meter CW FSK xtal 28.060 and a 600m rig 6.500-6.000=0.5 xtal mixer vxo
> which is now modified for 472/9 all based around 12ax7 6au6 and 6CL6 pa. The
> 630m version is now modified with yet another 12AX7 to carrier controlled
> screen ac couple AM modulation. Yes we are playing with QRP AM on 630m it
> doesn't have much range but is OK cross town but we are aware of other 630m
> users.
> 73 es GL Pete M0FMT IO91UX
>
> From: Dimitrios Tsifakis <dtsifakis@gmail.com>
> To: rsgb_lf_group@blacksheep.org
> Sent: Monday, 7 January 2013, 21:17
> Subject: Re: Fw: LF: 475kHz crystal
>
> Hi Pete,
>
> It's always good to know there is a decent and reliable (and not
> expensive!) crystal seller!
>
> By the way, I noticed that since I posted this message, about half a
> dozen 15200 kHz crystals were sold on eBay. Shall we be looking for
> for some 475 kHz signals in the near future? :-) I am planning to
> produce the simplest transmitter ever for 475 kHz and put the write-up
> in my web page. So far, this is the idea: A PIC ('cause I have plenty)
> produces the QRSS keying. It connects to the reset pin of a 74HC4060.
> There is a xtal oscillator on the 74HC4060 using the 15.2 MHz xtal.
> The output feeds a logic-level gate MOSFET. At this stage I am looking
> for a suitable MOSFET that can be driven directly by 5 V. There are
> plenty out there, any suggestions are welcome!
>
>
> Here in Oz, and while we wait for the international community to
> produce a band plan, we decided to concentrate all our activities on
> 475 kHz for QRSS/Digital and 473 for normal CW. Given the transmitting
> station density, it's perfectly OK to have QRSS signal mixed up with
> WSPR signals here. In fact, it is desirable to do that, as with a
> whopping 7 kHz of space, sub-noise signals are like the proverbial
> needle in the haystack.
>
> 73, Dimitris VK1SV
>
> 2013/1/8 M0FMT <m0fmt@yahoo.co.uk>:
>> Hi Dimitrios
>>
>> Sorry my lovely chart will not go through blacksheep so here is the raw
>> list..
>>
>> Thks fr enquiry Peter
>> OK have flwg ex-stock:-
>> 15.010MHz HC6/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.01875MHz HC18/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.0222MHz HC18/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.02246MHz HC6/U pin end, Glassholder, Fund, Par Res, 30pF load C, Good
>> Freq Stab ... £3-95/unit
>> 15.0865MHz HC25/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.1125MHz HC18/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.12084MHz HC18/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.128MHz HC6/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.150MHz HC18/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.1515MHz HC18/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.1792MHz HC6/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.200MHz HC49/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £3-25/unit
>> 15.2125MHz HC6/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.2209MHz HC6/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.2209MHz HC25/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.225MHz HC49/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £3-25/unit
>> 15.2292MHz HC25/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.24074MHz HC18/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.250MHz HC49/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £3-25/unit
>> 15.26875MHz HC18/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>> 15.275MHz HC49/U wire end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £3-25/unit
>> 15.2963MHz HC25/U pin end, Fund, Par Res, 30pF load C, Std Freq Stab ...
>> £2-95/unit
>>
>>
>>
>> Hi Dimitrios
>>
>> See attached list of 15meg xtals with prices from Vincent Jakomin a
>> thoroughly good guy!! No, no shares in his company.
>> For Europe p&p is £2-50 1st Class Airmail.
>> Send to:-
>> Vincent Jakomin
>> 69 Angus Close
>> CHESSINGTON
>> Surtrey KT9 2BN
>> vincent jakomin <vincentvoy@hotmail.co.uk>;
>>
>> Not sure if the Blacksheep will handle a file of 350kb so copy direct as
>> well.
>>
>> Good luck
>> 73 es GL Pete M0FMT IO91UX
>>
>> From: Dimitrios Tsifakis <dtsifakis@gmail.com>
>> To: rsgb_lf_group@blacksheep.org
>> Sent: Monday, 7 January 2013, 5:24
>> Subject: LF: 475kHz crystal
>>
>> Hello LF/MF group,
>>
>> I though this may be of interest to those what would like to build the
>> simplest transmitter possible for MF.
>>
>> I found these cheap crystals on eBay:
>>
>>
>> http://www.ebay.com.au/itm/2-PCS-15200-KHz-HC-49-U-X-TAL-Bargain-Pack-HC49U-/320828846717?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item4ab2e3b27d
>>
>> They are 15200 kHz which can be conveniently used with a 74HC4060 to
>> make an oscillator, then connect to the divide_by_32 line for a nice,
>> stable 475 kHz signal. You can then drive a class-E FET PA for any
>> kind of power you like.
>>
>> 73, Dimitris VK1SV
>>
>>
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