UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

MrBungle · 27th Jan 2018, 10:53 am

Interesting idea. Ultimately one of the reasons this is being built though is that it is going in a portable QRP transceiver and the current DDS VFO is consuming a lot of current (85mA on receive). Objective is as low current as possible here. Ergo I’d like to avoid the current consumption and weight of an ovenised oscillator. For the purposes of development I have considered building a thermostat controlled environmental chamber however so that might fit the bill for that. I can plot drift vs temperature then.

Edit: I will defer thinking about this too much though for now as I’ll never finish the thing!

27th Jan 2018, 10:53 am	#19
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Compensating for VFO drift Interesting idea. Ultimately one of the reasons this is being built though is that it is going in a portable QRP transceiver and the current DDS VFO is consuming a lot of current (85mA on receive). Objective is as low current as possible here. Ergo I’d like to avoid the current consumption and weight of an ovenised oscillator. For the purposes of development I have considered building a thermostat controlled environmental chamber however so that might fit the bill for that. I can plot drift vs temperature then. Edit: I will defer thinking about this too much though for now as I’ll never finish the thing!