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341. LF: Re: 475kHz WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sat, 25 Nov 2017 18:48:22 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-11/msg00226.html (10,839 bytes)

342. Re: LF: TXing 2200m WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 24 Dec 2017 12:40:15 +0000
Are you sure your 50uH choke is doing its job?    9t to get 50uH suggests ferrite witout a gap.  IN which case FDC thought the winding will be saturating the ferrite, driving it into non linearity an
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-12/msg00326.html (12,508 bytes)

343. Re: LF: TXing 2200m WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 24 Dec 2017 18:06:39 +0000
The other thing about that circuit that is wrong is the power out specification for the turns ratio / loading resistance. For a single ended PA, Pout max = Vdd ^2 / 2 / RL.   With a 9:1 (3:1 turns) t
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-12/msg00333.html (15,143 bytes)

344. Re: LF: TXing 2200m WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 24 Dec 2017 20:44:29 +0000
The scopematch circuit looks reasonable.   Arithmetic is correct (as an aside, I always group constants together for calibrations like that.    Measuring peak to peak across a 50R load, power then be
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-12/msg00337.html (14,920 bytes)

345. Re: LF: TXing 2200m WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 24 Dec 2017 22:42:16 +0000
Well ...    Using exactly the values in the filter circuit diagram, 50R transforms through the filter to 48.5 - j2.86 (Ret Loss = 30dB,  VSWR = 1.07)   [Using GM3SEK's original Netcalc prog.] So that
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-12/msg00340.html (18,233 bytes)

346. Re: LF: TXing 2200m WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 24 Dec 2017 22:55:14 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-12/msg00341.html (13,708 bytes)

347. Re: LF: TXing 2200m WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 24 Dec 2017 23:16:40 +0000
Yes Try anything and try to work out what is happening.  But first of all, he needs to know what power being deliverfed into a 50 ohmsload is seemingly higher than it 'can' be.    The Vdd^2/2/Rl cann
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-12/msg00344.html (15,903 bytes)

348. Re: R: Re: LF: TXing 2200m WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 29 Dec 2017 12:06:07 +0000
Sounds more like feedback.    RF feeding back into the driver stages.   The LF component you see is, perhaps, a beat between generated RF and oscillatory RF due to feedback. Or feedback itself oscill
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-12/msg00459.html (15,676 bytes)

349. Re: LF: Si5351A syntehsiser able to fire a FET driver chip directly?? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 1 Jan 2018 11:27:20 +0000
Seems an odd choice of driver chip.  A high/low side driver used in a non-bootstrapped mode to drive two low-side FETs  How about one of the normal FET driver chips - picking out one I've used in the
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00005.html (12,634 bytes)

350. Re: LF: Si5351A syntehsiser able to fire a FET driver chip directly?? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 1 Jan 2018 22:40:59 +0000
When I said bias half way, meant half way between the two logic threshold limits.  Ie mid way between 1.3V (upper limit of guaranteed '0' and 2.4V (lower limit of guaranteed '1')  so bias at 1.8V Not
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00019.html (13,384 bytes)

351. Re: LF: wsprnet (score: 1)
Author: Andy Talbot <[email protected]>
Date: Tue, 2 Jan 2018 10:34:36 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00021.html (9,712 bytes)

352. Re: LF: Si5351A syntehsiser able to fire a FET driver chip directly?? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 3 Jan 2018 16:41:19 +0000
There something odd  _ I've just checked the data sheet   http://ww1.microchip.com/downloads/en/DeviceDoc/22022b.pdf  for the MCP1404 you are using (I used the MCP14E4 slightly later I think and the
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00056.html (16,591 bytes)

353. Re: LF: Si5351A syntehsiser able to fire a FET driver chip directly?? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 3 Jan 2018 18:40:07 +0000
In that case you have a very odd MCP1404.    That looks like a typical CMOS threshold where the level is a fraction of the Vdd.  Often something like 0.45 Vdd ( very roughly.     CMOS guaranteed thre
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00062.html (19,193 bytes)

354. Re: LF: RE: Todmorden receiver (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 4 Jan 2018 19:34:20 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00073.html (14,096 bytes)

355. LF: Name of this Reflector (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 4 Jan 2018 19:37:28 +0000
I've just noticed that Emails to this reflector appear in my address as LineOne, even though the proper ...@Blacksheep address appears when I hover over it This applies to replies, and also to when I
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00074.html (8,176 bytes)

356. Re: SL settings for QRSS (was: Re: LF: RE: Todmorden receiver by Jack) (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sat, 6 Jan 2018 19:18:00 +0000
Someone, somewhere, must have designed a soundcard, or an A/D that looks to a PC like a soundcard to allow easy integration with much of this analysis software.   It really shouldn't be necessary to
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00093.html (16,035 bytes)

357. Re: LF: Progress? with the PA (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 7 Jan 2018 17:34:09 +0000
What core ? What  dimensions ? Does it obey the fundamental equation for saturation in a core ? Vrms = 4.44 .F . N . A . B F Hz,   N turns,  A core area area in m^2   B Tesla Keep B < 0.1 and  ferrit
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00118.html (10,547 bytes)

358. Re: LF: EbNaut at 8270.01953125 (score: 1)
Author: Andy Talbot <[email protected]>
Date: Tue, 9 Jan 2018 16:24:07 +0000
Gentlemen,   Please excuse a question from one who watches from the sidelines, the amazing reports of contacts at 8.2 kHz.   My question is how long does it take to measure 8270.01953125 Hz? Based o
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00134.html (22,934 bytes)

359. Re: LF: EbNaut at 8270.01953125 (score: 1)
Author: Andy Talbot <[email protected]>
Date: Tue, 9 Jan 2018 19:28:11 +0000
Just a thought The say GPSDO is delivering 16.384MHz But there's a very good chance the GPSDO itself uses a DDS, so is subject to 32 bit tuning resolution.   Unless it has a 48 bit device or uses a 
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00142.html (17,655 bytes)

360. Re: LF: 136kHz WSPR (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 22 Jan 2018 13:52:28 +0000
Heard after I turned on the Rx after Roger's 2nd post. 1320 -13 1.5 0.137514 1 G4FTC IO91 13 73 1326 -12 1.4 0.137514 0 G4FTC IO91 13 73 1340 -12 1.2 0.137432 0 G4FTC IO91 13 73 1344 -13 1.4 0.137433
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00279.html (20,716 bytes)


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