Flex 1500 Frequency Stability
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Flex 1500 Frequency Stability Expand / Collapse
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Posted Monday, November 9, 2009 8:40 AM
Supreme Being

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I was hoping Flex would come out with transverters which would install inside the Flex 5000A transceivers but the Flex 1500 would be ideal for a stand alone VHF/UHF/Microwave station. Of course the 1500 would have great accuracy and stability using my Z3801A GPS 10 MHz reference but would only be as good as the transverters oscillator.  The Elecraft Transverters such as the XV144 and XV432 perform very well taking up little room, yet their crystal oscillator is lacking in  stability.  For example, the XV144 uses a 116 MHz crystal for a 28 MHz I.F.and with the slightest change in room temperature, it can drift several hertz. There is a company in Germany, Kuhne Electronics who makes some of the best amateur radio VHF to Microwave equipment in the world using a reference input.  This link shows their 144 MHz Transverter.  Perhaps Flex Radio can eventually come out with outboard transverters?  When that happens, I will see you on perhaps 144.210000 Mhz?

We suffer from kleptomania and sometimes have to take something for it.
Post #2021
Posted Monday, July 1, 2013 3:47 PM
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I have achieved frequency stability to 1 Hz with the Flex-1500 & Elecraft XV144 transverter combination, using a GPS disciplined OCXO on 116 MHz. I have documented the XV144 frequency stability and drift data comparing the GPS control against the stock crystal oven option with enhanced thermal insulation here https://picasaweb.google.com/114032640816757126398/XV144FrequencyStabilityModifications

The stock FLEX-1500 TCXO is sufficient to hold the frequency to within 1 Hz. Enabling the 10 MHz sine wave external reference on the FLEX-1500 should increase the frequency accuracy and stability to the millihertz range.

Carol, KP4MD




K3ROJ (11/9/2009)
I was hoping Flex would come out with transverters which would install inside the Flex 5000A transceivers but the Flex 1500 would be ideal for a stand alone VHF/UHF/Microwave station.Of course the 1500 would have great accuracy and stability using my Z3801A GPS 10 MHz reference but would only be as good as the transverters oscillator. TheElecraft Transverterssuch as the XV144 and XV432 perform very well taking up little room, yet their crystal oscillator is lacking in stability. For example, the XV144 uses a 116 MHz crystal for a 28 MHz I.F.and with the slightest change in room temperature, it can drift several hertz.There is a company in Germany, Kuhne Electronics who makessome of the best amateur radio VHF to Microwave equipment in the world using a reference input. This link showstheir 144 MHz Transverter. Perhaps Flex Radio can eventually come out with outboard transverters? When that happens, I will see you on perhaps 144.210000 Mhz?


KP4MD/W6
http://www.qsl.net/kp4md
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