{Collins} Need RCA SK3089 diode data (312B-4 mod)

[Mike Waters <mikewate@xxxxxxxxx>]

In 1980, I replaced the original 1N82A diodes in my Collins 312B-4's
directional coupler with these, and I forget exactly why I did (or where I
got the mod info from). The original RCA SK3089 datasheet might give some
clue.

Google failed me on this one; all I could find was a cross-reference to an
NTE-112. And based on my past experiences with NTE semiconductor
cross-references, I don't trust the NTE data.

73, Mike
www.w0btu.com

On Fri, May 1, 2015 at 1:16 PM, Mike Waters <mikewate@xxxxxxxxx> wrote:

> My RE 312B-4 has the following mods, which I highly recommend:
>
> 1.) 1N82A diodes replaced with RCA SK3089 diodes. I forget the details on
> those.
>
> 2.) 7.1 uF tantalum capacitors to make it more peak-reading, as the
> Collins 302C wattmeter has.
>  One 7.1 uF capacitor goes between R3/R5/L1 and ground; the other one
> between R4/R6/L2 and ground.
>  The negative lead on each tantalum capacitor is grounded.
>  Three 2.7 uF/20v in parallel = 7.1 uF.
>
> 73, Mike
> www.w0btu.com
>
> On Thu, Apr 30, 2015 at 12:47 PM, <donroden@xxxxxxxxxx> wrote:
>
>> ... I replaced both 1N82A s  with low conduction / high back resistance
>> 1N5711s.
>> ... What is the next logical step ?
>>
>
>