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Total 5 documents matching your query.

1. Re: LF: 817 drift (score: 1): Author: Roger Lapthorn <[email protected]>; Date: Sun, 3 Feb 2013 21:36:29 +0000; The best is not to use a HF TRX for the MF/LF stuff but to use a simple downconverter, at least for the TX side. A simple NE612 mixer and a xtal (e.g. 1.8432 MHz / 4 by using a CD4013) and a reasona; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-02/msg00073.html (14,080 bytes)
2. LF: 817 drift (score: 1): Author: Laurence KL1 X <[email protected]>; Date: Sun, 3 Feb 2013 10:45:22 -0900; Roger - I had the same drift issue and added the txco with little improvement - best was when unit was powered driven by lower voltage - think mine is set around 9.6V at the moment and less heat..it; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-02/msg00258.html (10,940 bytes)
3. Re: LF: 817 drift (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Sun, 03 Feb 2013 22:13:20 +0100; The best is not to use a HF TRX for the MF/LF stuff but to use a simple downconverter, at least for the TX side. A simple NE612 mixer and a xtal (e.g. 1.8432 MHz / 4 by using a CD4013) and a reasonab; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-02/msg00259.html (12,242 bytes)
4. Re: LF: 817 drift (score: 1): Author: Roger Lapthorn <[email protected]>; Date: Sun, 3 Feb 2013 20:38:14 +0000; If WSPR15 is going to succeed for me I need a more stable rig (or a 0.5ppm TXCO fitted to the FT817) or a fan to force cool the FT817 - even when running 500mW! I'll leave the rig on for a little whi; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-02/msg00394.html (13,007 bytes)
5. Re: LF: 817 drift (score: 1): Author: [email protected]; Date: Sun, 3 Feb 2013 16:25:21 -0330 (NST); Hello Roger and Laurence, The '817 that I'm using is quite stable without the tcxo. I've used it for receive only and found that it stayed on QRG within 0.1 Hz for several hours on 137 kHz. Perhaps t; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-02/msg00585.html (11,044 bytes)

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