[R-390] Stability

[Tom Chirhart]

In the Navy we never turned them off but on occasion when shifting from shore power to generators when getting underway we did lose power...prayed that they survived the surge... Like Bob said, the 1051's were left on too, as guard channel receivers for HiComm nets, ship-shore RATT, HF broadcast receivers etc.. The only time we turned off a 390 was when the ET decided to complete the preventive maintenance so he could get his liberty card from the Chief ET... Been there, done that doing PM on antenna couplers at the end of the yard arms up 90 feet just to get off the ship for a cold 807 on the beach... Be patient these old receivers were built and weigh like tanks..
73
Tom

Sent from my iPad

On May 31, 2013, at 7:34 AM, Bob Camp <ham at kb8tq.com> wrote:

> Hi
> 
> A lot depends on the environment your radio is in and how long it's been off. If you are trying to run narrow shift RTTY unattended with sharp demos filters, the answer may be days. If you are trying to listen to a local AM broadcast, the answer may be a few minutes with occasional intervention. In normal operation these radios were not used like the R-1051 in set / forget mode. It was expected that you would have to tweak them from time to time. 
> 
> All that said, a good radio running continuously, in the right conditions, will hold < +/-40 Hz all day long. I certainly would not toss one out because it doesn't. It's also tough to fix if it does not, since the conversion crystals are as much part of the problem as anything else. 
> 
> Bob
> 
> On May 31, 2013, at 12:27 AM, Gordon <gordon at n6wk.com> wrote:
> 
>> Since I am fairly new to my R-390A, I have a question.
>> How long does it normally take from cold turn on, until the Radio is stable and no longer drifts?
>> 10 minutes, 30 Minutes, an hour ?
>> What is considered normal and how much can I expect it to drift during that time?
>> Thanks,
>> Gordon
>> N6WK
>> 
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