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- Written by: Dan - W5EHS
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First Impressions
It was only a 10 day trip from China for this 10MHz frequency standard to arrive at my station. It looks like the pictures on EBay and has four standoffs on the circuit board for mounting into an enclosure. The BNC connectors also have the necessary hardware for mounting through a sidewall. The circuit board layout is substantially different in the details than shown on Ebay. They layout seems to be flipped. That means there are more than one layout or version, but this is not a concern of mine. Just an observation.
All in all a very impressive looking piece of electronic hardware. This is a first look impression. The real proof is of course in performance.
It will be awhile before I can rig up a test. Perhaps one of the clan members at NTMS can help with frequency and calibration tests. ha! From what I have seen, there are folks that love doing that.
There are no data sheets or other instructions provided with the delivery. Here is a datasheet I discovered just for the TCO-6920A Xtal dual oven. TCO-6920A.pdf
I assume from the EBay photos there is a built in splitter for the two outputs. I also assume a termination load may be required if using just one output. I see what appears to be voltage regulators on the PC board but I further assume something more stable than a wall wart will be needed for the power supply ( 12 or 15 volt). Hmm... that's a lot of assumptions! :)
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I received my ApolLO local oscillator board yesterday. Now my DEMI transverter kit is complete. As you can see it is complete and ready for use. It will be built into the L28-144 enclosure.
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I received my converter kit from Down East Microwave, Inc. yesterday. As you can see in the picture it is labelled L144-28INAC. Unfortunately I ordered a L144-28IACK. The difference is the IACK includes the ApolLO synthesizer which is NOT in the kit shown here. I admit I don't completely understand the meaning of the DEMI suffix codes.
The instructions on how to install the ApolLO into the converter are in the package. The ApolLO is pre assembled so it is certainly packaged in a separate component bag.
I had a concern that perhaps the labels were switched between two orders and another ham received the IACK package.
An overnight returned email from DEMI confirms it was a shipping error and the ApolLO is already on its way. No big deal. I am not in immediate need. I do like to make sure I receive my complete order.
I operate a small mail order business myself and have personally made errors such as this one. The annoyance is usually overcome by my immediate action to make a correction. Shit happens. It's how fast you change the diaper that restores contentment.
Thanks to positive action from Sandra, DEMI is NOT on my "S" list... :)