Ordered a bunch of these to test against the TAPR device https://www.aliexpress.com/item/4001231758949.html?spm=a2g0s.9042311.0.0.151 84c4d1hMhZs TLV3501 Single Chan High Speed Comparator Frequency Meter Front Shaping Module DC 2.7-5V Frequency Counter SMA Specifications:
Supply voltage: 2.7-5VDC Input voltage: 8-1000mV (effective value) Output level: rail to rail output, can directly TTL / CMOS level Input frequency: 1Hz-120 MHz, Min.1Hz shape: SMA female head (external screw hole) Input impedance: 20 K ohm Product Use: Sine wave The zero crossing comparator comparator Colour:green Material:metal Size:about 5*2.5cm Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y les...@veenstras.com 452 Stable Ln (HC84 RFD USPS Mail) Keyser WV 26726 GPS: 39.336826 N 78.982287 W (Google) GPS: 39.33682 N 78.9823741 W (GPSDO) Telephones: Home: +1-304-289-6057 US cell +1-304-790-9192 Jamaica cell: +1-876-456-8898 -----Original Message----- From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Mike Feher Sent: Wednesday, September 02, 2020 10:01 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] HP-10811AB-OCXO interface questions I remember the days when we had to build our own discrete Schmitt trigger to do this. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -----Original Message----- From: time-nuts <time-nuts-boun...@lists.febo.com> On Behalf Of Bruce Griffiths Sent: Wednesday, September 2, 2020 1:46 AM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Subject: Re: [time-nuts] HP-10811AB-OCXO interface questions For sine to square wave conversion use LTC6957 (select variant to suit following logic). Bruce _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.