{"id":257,"date":"2017-03-03T19:43:46","date_gmt":"2017-03-03T19:43:46","guid":{"rendered":"https:\/\/klubnl.pl\/wpr\/?page_id=257"},"modified":"2017-03-03T19:43:46","modified_gmt":"2017-03-03T19:43:46","slug":"proste-zrodlo-sygnalu-1pps","status":"publish","type":"page","link":"https:\/\/klubnl.pl\/wpr\/en\/artykuly\/proste-zrodlo-sygnalu-1pps\/","title":{"rendered":"Simple 1PPS signal source and distribution amplifier"},"content":{"rendered":"

A simple 1PPS signal source and distribution amplifier<\/h3>\n

Radioamateurs often need a precise time and frequency standard. The cheapest source of this signal is usually a GPS. This article describes a simple 1PPS signal source and distribution amplifier.<\/p>\n

GPS receivers usually have a 1PPS output. This is one impulse per second, with the rising edge exactly on the begining of each second. Sometimes there are also other outputs such as . 1kHz, 10kHz, 10MHz etc.<\/p>\n

The 1PPS signal source in this article is a u-bloc NEO-6M GPS receiver. I’ve used a cheap (about 15 euro) NEO6MV2 module, presented on Fig 1. Other modules can also be used, as long as they have a 1PPS output.<\/p>\n

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Fig 1. Module with a u-blox NEO-6M GPS
\n<\/em><\/p>\n

Fig 2 shows the distribution amplifier. A 74HC04 is used as a buffer, the outputs are avaliable as BNC sockets. One of the 74HC04 outputs is used to drive a LED which shows the 1PPS signal.<\/p>\n

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Fig 2. GPS module and 1PPS distribution amplifier
\n<\/em><\/p>\n

The antenna input is connected to a SMA socket for an external GPS antenna. This antenna should see at least a few GPS satellites, usually it sufficient to place it just outside the window.<\/p>\n

Communication with the GPS module can be done via the RS232-TTL serial port using the USB\/RS232-TTL module visible on the upper part of Fig 3.<\/p>\n

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Fig 3. The receiver and amplifier in a box
\n<\/em><\/p>\n

Configuration is done via the u-Center software from u-blox, avaliable here:<\/p>\n

https:\/\/www.u-blox.com\/en\/product\/u-center-windows<\/a><\/p>\n

 <\/p>\n

Because i’m using the 1PPS signal in vlfrx-tools, the pulse has been shortened to 1ms (it’s 100ms by default).<\/p>\n

 <\/p>\n

Author: Jacek SQ5BPF<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

A simple 1PPS signal source and distribution amplifier Radioamateurs often need a precise time and frequency standard. The cheapest source of this signal is usually a GPS. This article describes a simple 1PPS signal source and distribution amplifier. GPS receivers usually have a 1PPS output. This is one impulse per second, with the rising edge … Continue reading “Simple 1PPS signal source and distribution amplifier”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":125,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-257","page","type-page","status-publish","hentry"],"translation":{"provider":"WPGlobus","version":"3.0.1","language":"en","enabled_languages":["pl","en"],"languages":{"pl":{"title":true,"content":true,"excerpt":false},"en":{"title":true,"content":true,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/pages\/257","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/comments?post=257"}],"version-history":[{"count":2,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/pages\/257\/revisions"}],"predecessor-version":[{"id":261,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/pages\/257\/revisions\/261"}],"up":[{"embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/pages\/125"}],"wp:attachment":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/media?parent=257"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}