Archive for the ‘Hiking’ Category

Binuaral Receiver Update

May 28, 2014

Finally made some time to work on the Binuaral Receiver today. Finished installing the parts for the RF Phase Shift and Product Detector sections and now am ready to install the LO/Product Detector interface transformer. The transformer is a trifilar wound torroid “roid”. I don’t care too much about winding them, or tinning the leads…but do like them as I can make each into a value that is needed and not have to order a particular inductor for each project.

I was checking the LO output with the DSA815-TG spectrum analyzer earlier today. Noticed that the second and third harmonics are only down about -15 to -17 dBm from the fundamental frequency. I may have to build either a LPF or BPF if this project turns into a transceiver instead of just a receiver.

Anyway, time to eat and get to Bible study (Wednesday night activity at our church), so will have to finish the install of the transformer either tonight or tomorrow after I get back from a group hike along the Waterloo Trail near here.

Recovering from FDIM/Hamvention

May 21, 2014

Have about recovered from the trip to Dayton. Rained the entire time except Sunday and Monday (the day we came home) and quite cool. But, if you don’t have to like the weather to enjoy it at Dayton. We stay at the KOA campground every year and love the friendships we have made the there.

As far as what goodies I bought…some 2.5″x3.0″ prototyping boards at a dollar a piece (good deal), an interface for my MFJ-259B so I can plot my sweeps on the PC, and finally broke down and bought the DSA815-TG spectrum analyzer. I have been struggling about buying one for over a year…so made the plunge. I have been playing with it for a few days now and makes me wonder how I ever got along without it! I put it next to my DS1052E scope and was able to remove several pieces of older test equipment that I won’t need anymore on the bench. Also picked up a hiking pack for three to four day trips on the trails.

I hope to get back to the Binuaral Receiver in a day or two. I am anxious to use the new SA on it and see how clean the crystal resonator really is. If it is clean, I will use those prototyping boards and make both 40 meter and a 80 meter resonators for the work bench.