{"product_id":"rx-power-disconnect-via-rca-ptt","title":"RX Power Disconnect via RCA\/PTT","description":"\u003cstyle\u003e\n\/* RF.Guru Shopify product page styles (standard) *\/\nh2, h3, h4 { font-weight: bold; margin-top: 1.2em; }\nul { margin-left: 1.2em; margin-bottom: 0.8em; }\nul li { margin-bottom: 0.4em; }\np { margin-bottom: 0.8em; }\n\n\/* Inline disclaimers *\/\n.inline-note { color: #8a8a8a; font-style: italic; display: block; margin-top: 0.3em; }\n\n\/* Table tidying *\/\ntable { width: 100%; border-collapse: collapse; margin: 0.8em 0; }\nth, td { border: 1px solid #ddd; padding: 6px 8px; text-align: left; vertical-align: top; }\nthead th { background: #f7f7f7; }\n\n\/* Highlight boxes (yellow variant) *\/\n.disclaimer-box,\n.related-reading,\n.optional {\n  background: #fff8e5;\n  border: 1px solid #f0d78c;\n  border-radius: 6px;\n  padding: 0.8em;\n  margin: 1.2em 0;\n}\n.disclaimer-box b,\n.related-reading b { color: #b26d00; }\n\n\/* Technical highlight (blue) *\/\n.tech-box {\n  background: #eef6fb;\n  border: 1px solid #c6d9e8;\n  border-radius: 6px;\n  padding: 1em;\n  margin: 1.5em 0;\n  font-size: 0.95em;\n  line-height: 1.5em;\n}\n\n\/* Standard Mini-FAQ block (gray) *\/\n.mini-faq {\n  background: #f4f4f4;\n  border: 1px solid #ddd;\n  border-radius: 6px;\n  padding: 1em;\n  margin-top: 2em;\n}\n.mini-faq h3 { margin-top: 0; }\n.mini-faq ul { list-style: none; padding-left: 0; margin: 0; }\n.mini-faq li { margin-bottom: 0.6em; }\n.mini-faq li b { margin-right: .3em; }\n\n\/* Gray service\/perk note *\/\n.info-box {\n  background:#f9f9f9; border:1px solid #ddd; border-radius:6px; padding:1em; margin:1.2em 0;\n}\n\n\/* Simple responsive figure *\/\n.rf-figure { margin: 1em 0; }\n.rf-figure img { width: 100%; height: auto; border-radius: 12px; border: 1px solid #e6e6e6; }\n.rf-figure figcaption { color:#8a8a8a; font-style: italic; margin-top: .4em; }\n\u003c\/style\u003e\n\n\u003c!-- Disclaimer --\u003e\n\u003cdiv class=\"disclaimer-box\"\u003e\n  \u003cb\u003eHandmade in Belgium.\u003c\/b\u003e Fulfilment times may vary with order volume. Please allow \u003cb\u003e2–3 weeks\u003c\/b\u003e for assembly and shipping.\n\u003c\/div\u003e\n\n\u003cp\u003eThe \u003cb\u003eRF.Guru RX Power Disconnect via RCA\/PTT\u003c\/b\u003e automatically removes DC power from a receive-only accessory whenever your transmitter keys. Place it between your \u003cb\u003e12–13.8 V supply\u003c\/b\u003e and a Bias-T, active receive antenna, LNA, or preamp; connect its RCA control input to a compatible PTT output, and the accessory is powered down for the duration of transmit.\u003c\/p\u003e\n\n\u003cdiv class=\"tech-box\"\u003e\n  \u003cb\u003eHow it works (in plain terms)\u003c\/b\u003e\u003cbr\u003e\n  • \u003cb\u003ePTT open \/ receive:\u003c\/b\u003e the Powerpole output is powered.\u003cbr\u003e\n  • \u003cb\u003ePTT grounded \/ transmit:\u003c\/b\u003e the Powerpole output is switched off.\u003cbr\u003e\n  • \u003cb\u003ePTT released:\u003c\/b\u003e power returns automatically for receive.\u003cbr\u003e\n  \u003cspan class=\"inline-note\"\u003eThe control input is active-low: it requires a contact, open-collector, or open-drain PTT output that closes to ground during transmit.\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e\u003cb\u003eWhy Disconnect RX Power During Transmit?\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp\u003eSome receiving setups use powered accessories close to a transmitting antenna. Switching those accessories off during transmit can prevent their active electronics from remaining energized in a very strong RF field, reduce unwanted interaction, and make station operation automatic—without a separate power switch to remember.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cb\u003eAutomatic operation:\u003c\/b\u003e follows your station’s PTT state.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eSolid-state switching:\u003c\/b\u003e a P-channel MOSFET switches the positive supply rail without relay chatter or contact wear.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eReceive-first default:\u003c\/b\u003e with no RCA cable connected, power remains available at the output.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eSimple shack wiring:\u003c\/b\u003e Powerpole DC input and output, plus an RCA PTT control jack.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cb\u003eConnectors \u0026amp; Typical Wiring\u003c\/b\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eConnection\u003c\/th\u003e\n      \u003cth\u003eConnect To\u003c\/th\u003e\n      \u003cth\u003eFunction\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cb\u003eDC Input\u003c\/b\u003e\u003c\/td\u003e\n      \u003ctd\u003e12–13.8 V DC supply\u003c\/td\u003e\n      \u003ctd\u003ePowerpole input for the source supply\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cb\u003eSwitched DC Output\u003c\/b\u003e\u003c\/td\u003e\n      \u003ctd\u003eBias-T, active RX antenna, LNA, or preamp\u003c\/td\u003e\n      \u003ctd\u003ePower is present in receive and removed while PTT is grounded\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cb\u003eRCA\/PTT Input\u003c\/b\u003e\u003c\/td\u003e\n      \u003ctd\u003eCompatible transmitter, transceiver, sequencer, or keying interface\u003c\/td\u003e\n      \u003ctd\u003eRCA center contact to ground switches the DC output off\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cdiv class=\"tech-box\"\u003e\n  \u003cb\u003eRecommended Hook-Up\u003c\/b\u003e\u003cbr\u003e\n  1) With the station switched off, connect your \u003cb\u003e12–13.8 V supply\u003c\/b\u003e to the DC input.\u003cbr\u003e\n  2) Connect the \u003cb\u003eswitched Powerpole output\u003c\/b\u003e to the receive accessory you want to control.\u003cbr\u003e\n  3) Connect the \u003cb\u003eRCA\/PTT input\u003c\/b\u003e to a control output that grounds during transmit.\u003cbr\u003e\n  4) Test at low power: confirm the accessory is powered in receive and switches off before transmitting at normal power.\u003cbr\u003e\n  \u003cspan class=\"inline-note\"\u003eThe PTT input and DC supply share a common ground; the control input is not galvanically isolated.\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e\u003cb\u003ePTT Compatibility\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp\u003eUse a PTT\/keying output that behaves as a \u003cb\u003eground closure\u003c\/b\u003e during transmit. Suitable sources normally include a dry relay contact, open-collector output, or open-drain output. The RCA sleeve is ground and the center contact is the active-low control input.\u003c\/p\u003e\n\n\u003cdiv class=\"disclaimer-box\"\u003e\n  \u003cb\u003eCheck before connecting:\u003c\/b\u003e Do not apply a positive control voltage to the RCA input. If your radio or amplifier uses a voltage-output keying signal, negative-voltage keying, or an unfamiliar accessory interface, use a compatible relay\/interface or verify the connection first. Never assume that every RCA “PTT” connector uses the same electrical convention.\n\u003c\/div\u003e\n\n\u003ch2\u003e\u003cb\u003eProtection \u0026amp; Switching\u003c\/b\u003e\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cb\u003eReverse-polarity protection:\u003c\/b\u003e a series protection diode helps protect the unit from an accidentally reversed DC input.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eResettable input fuse:\u003c\/b\u003e a 0.75 A hold-class PTC helps limit sustained overcurrent; actual trip behavior depends on load and temperature.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eProtected control input:\u003c\/b\u003e the RCA\/PTT line includes transient clamping.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eDefined off state:\u003c\/b\u003e the MOSFET gate is pulled to the supply rail so a grounded PTT command switches the output off cleanly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eInput-power LED:\u003c\/b\u003e shows that protected input power is present.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp class=\"inline-note\"\u003eThe LED monitors the protected input supply; it is not an independent indication that the switched output is on.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cb\u003eWhat This Unit Does—and Does Not Do\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp\u003eThis unit controls \u003cb\u003eDC power\u003c\/b\u003e to a receive accessory. It does not switch or isolate the RF signal path, detect RF automatically, provide adjustable sequencing delays, or replace a proper T\/R switch, receiver protector, RF limiter, antenna relay, grounding system, or lightning protection.\u003c\/p\u003e\n\n\u003cp\u003eBecause the output is normally on, a missing or unplugged PTT cable will \u003cb\u003enot\u003c\/b\u003e disconnect the receive accessory during transmit. Always verify PTT operation as part of your station checks.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cb\u003eIncluded\u003c\/b\u003e\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cb\u003eRF.Guru RX Power Disconnect via RCA\/PTT\u003c\/b\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cb\u003ePowerpole DC input and switched output\u003c\/b\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cb\u003eRCA\/PTT control input\u003c\/b\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cb\u003eInput-power LED\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cb\u003eSpecs at a Glance\u003c\/b\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eParameter\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eAutomatic DC power disconnect for receive-only accessories\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eNominal Supply\u003c\/td\u003e\n      \u003ctd\u003e12–13.8 V DC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eDC Connections\u003c\/td\u003e\n      \u003ctd\u003ePowerpole input and switched Powerpole output\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOutput Voltage\u003c\/td\u003e\n      \u003ctd\u003eApproximately the DC input voltage minus the series protection and switching losses\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eControl Connection\u003c\/td\u003e\n      \u003ctd\u003eRCA, active-low ground closure\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eReceive State\u003c\/td\u003e\n      \u003ctd\u003ePTT open; switched output on\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eTransmit State\u003c\/td\u003e\n      \u003ctd\u003ePTT grounded; switched output off\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSwitching\u003c\/td\u003e\n      \u003ctd\u003eHigh-side P-channel MOSFET\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInput Fuse\u003c\/td\u003e\n      \u003ctd\u003e0.75 A hold-class resettable PTC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eIsolation\u003c\/td\u003e\n      \u003ctd\u003eNon-isolated; PTT and DC supply share ground\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProtection\u003c\/td\u003e\n      \u003ctd\u003eReverse-polarity protection, resettable input fuse, and PTT transient clamp\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp class=\"inline-note\"\u003eUse only with receive accessories whose voltage and current requirements are compatible with the supply and this unit. The resettable fuse is a protection device, not a precision current limiter.\u003c\/p\u003e\n\n\u003c!-- Mini-FAQ --\u003e\n\u003cdiv class=\"mini-faq\"\u003e\n  \u003ch3\u003e\u003cb\u003eMini-FAQ\u003c\/b\u003e\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eWhat happens when I press PTT?\u003c\/b\u003e ... A compatible PTT output grounds the RCA control input, and the unit removes DC power from the connected receive accessory.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eWhat happens when the RCA cable is unplugged?\u003c\/b\u003e ... The switched output stays on. The unit is normally on in receive and requires a ground command to switch off.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eCan I feed a positive PTT voltage into the RCA jack?\u003c\/b\u003e ... No. The input is designed for a contact or transistor output that closes to ground.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eDoes it disconnect my antenna or RF cable?\u003c\/b\u003e ... No. It switches accessory power only; RF-path switching or receiver protection must be provided separately where needed.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eDoes it include a transmit delay or sequencer?\u003c\/b\u003e ... No. It follows the external PTT signal directly, so any required timing must come from your station controller or sequencer.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eIs the PTT input isolated?\u003c\/b\u003e ... No. The RCA\/PTT ground and DC negative are common.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eCan I use it with a Bias-T?\u003c\/b\u003e ... Yes. Place it in the Bias-T’s DC supply lead so Bias-T power is removed during transmit.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cb\u003eInterested in more technical content? \u003ca href=\"https:\/\/shop.rf.guru\/pages\/subscribe\"\u003eSubscribe to our updates\u003c\/a\u003e for deep-dive RF articles and lab notes.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQuestions about PTT compatibility or installation? Feel free to \u003ca href=\"https:\/\/shop.rf.guru\/pages\/contact\"\u003econtact RF.Guru\u003c\/a\u003e before connecting the unit to an unfamiliar keying interface.\u003c\/b\u003e\u003c\/p\u003e\n","brand":"RF Guru","offers":[{"title":"Default Title","offer_id":55074284863830,"sku":"2026-P-001","price":39.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4402\/4764\/files\/biast75hf.webp?v=1750706525","url":"https:\/\/shop.rf.guru\/products\/rx-power-disconnect-via-rca-ptt","provider":"RF Guru","version":"1.0","type":"link"}