[ARC5] RAT/RAV radios question

[kn7sfz]

I for one, would be interested in what RAT and RAV stand for?

Thanks in advance to anyone willing to educate the great unwashed...:-)

Richard  kn7sfz

On 6/22/2020 3:34 PM, Kenneth G. Gordon wrote:
> On 22 Jun 2020 at 17:52, Michael Hanz wrote:
>
>> Well, the owner would have had to have some patience to use it without modification, but maybe
>> the band wasn't as crowded back then.  The receiver has a selectivity of about 14kHz, and the
>> 12SK7s are probably starting to pant a little at that frequency, requiring 20uV to produce the
>> 10mW audio power output described in the manual at https://aafradio.org/flightdeck/RAT.htm
>>
>> On 6/22/2020 4:43 PM, Tim wrote:
>>      OK Mike (and Mike) - thanks for recalibrating me!  HiHi.  The TX in use must have been
>>      something more mundane at the time.  Guys were Hammering command transmitters to 10
>>      meters back then so that was likely what I remembered seeing.. But I DO kind of remember
>>      that the RX actually had a dial that covered 27 mc - I knew enough about them to realize it
>>      was not the typical lower HF coverage set that I was seeing in the surplus shops at the
>>      time...
> Although I am not knowledgeable about the RAT/RAV receivers, some of you may remember
> my adventure with a BC-454 which someone had begun to convert to cover 10 meters back
> in 1950 or so, but never finished, and my travails with it. I described that in detail here, asking
> for advice when I ran into problems.
>
> When the entire project was finished, I was most surprised to measure an MDS (Minimum
> Discernible Signal) of 1 microvolt on CW (BFO on) at 29 MHz using the original 12SK7s. It
> showed about 3 microvolts for AM.
>
> Switching the RF amp and 1st IF to 12SG7s did reduce the noise, but didn't really appear to
> improve MDS at all. S+N/N ratio obviously improved, but I didn't measure that yet.
>
> The receiver tunes just short of 28 MHz to just above 30 MHz and works very well.
>
> Ken W7EKB
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