![]() Were the driving force as he ran a slew of FM and repeater articles in the late 1960s and "get" repeaters and remote bases until about 10-15 years later (Wayne Green and 73 magazine This article is an overview of Amateur FM and repeaters and despite the date, the ARRL didn't There is a LOT of theory here.Īmateur FM and Repeaters from QST magazine October 1969 513 kB PDF by Les Cobb W6TEE and Jay O'Brien W6GDO (SK) This is the very technical information they used to send to crystal manufacturers. This is good reading alongĬrystal Technology Design Guidelines 2.4 MB PDF by Motorola, dated May 1990 Vectron is a company known for precision crystal oscillators. Why should you really spend $50 to re-crystalĪ channel element or ICOM? by Kevin Custer W3KKC, Jeff DePolo WN3A, Robert Meister WA1MIK,Įric Lemmon WB6FLY (SK), and Mike Morris WA6ILQ Personally, I'd putĪ high-third-order-intercept preamp (like an AngleLinear) in front of the crystal filter.Īn ongoing glossary updated regularly. ![]() Signal that any amplification after it just amplifies the noisy signal. Your 5 dB of insertion insertion loss attenuates a barely understandable signal down to a noisy Reduce desense and intermod, then uses a preamp to make up for the loss. Hood describes how a crystal filter can be placed in front of a VHF repeater receiver to ![]() Like a good area for digital / Dstar / P25 repeater outputs or point-to-point packet links.Īpplication in Amateur VHF Repeaters 208 kb PDF by Joseph M. The European FRS radios (the service is called "PMR 446") usesĨ narrowband channels in that range (complete with user-selectable CTCSS codes), ![]() While it's not worth a separate article, you don't want to have a UHF repeater inputīetween 446.0 and 446.100. Look for the "Repeater applications notes" - proven repeater system design techniquesįrom a VHF / UHF / weak signal / contesting fan and RF design guru Good two-way radio technician giving practical examples! 400+ pages of solid info.Īnd Articles offsite link to Chip Angle's web site ![]() Contributions / corrections are ALWAYS welcome!Įverything is still here items just got grouped together by function.Ĭommunications Manual" by Harold Kinley - 44MB PDF download. ![]()
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