[Elecraft] Sub RX - Diversity vs. Linked

[Bill W4ZV]

Ken Widelitz wrote:
> 
> Is the difference between the Sub RX being Linked and being in Diversity
> merely that you can still change the Sub RX frequency using the VFO B
> knob?
> If you can tune the Sub RX independently using the VFO B knob while
> linked,
> what is the purpose of being linked as opposed to just being in Diversity
> unlinked? Am I missing something?
> 
> ##See page 37 of the current manual.  When LINKed, VFO A tunes both Main
> and Sub at whatever offset the VFO offsets were when LINKed.  You can then
> change VFO B, but then VFO A will tune BOTH at whatever the new offset is. 
> I don't know what purpose an offset serves but possibly repeater splits,
> transverters or some other feature I never use.  I always LINK my VFOs on
> the same QRG.
> 
> In Diversity, both VFOs are LINKed to what was set on VFO A and VFO B is
> now independent (and can be used to set a SPLIT TX freq for example).  See
> below for a note I sent to Frank W3LPL about how I use Diversity.
> 
>>Another related issue - because I use Writelog with the W5XD Multi-Keyer
for
> SO2R, I need to have the headphone audio output from each radio in mono,
> that is, the Sub RX and the main RX mixed together, so I can listen to
> both
> left and right radios at the same time. Does mixing the Sub RX and main RX
> together in Diversity mode negate any of the Diversity benefits, or will I
> get the same benefit, just in mono so I won't know which antenna is doing
> the better job at any particular time without playing with the RF gain
> control for each?
> 
> ##I haven't actually tried that myself so I can't say for sure.  If the
> two audio channels are summed, it seems like you should get some of the
> benefits (e.g. QSB reduction, hearing a signal present on one antenna and
> not the other, etc).  Having used true Diversity for ~8 months, I dislike
> using the K3 without it on the low bands.
> 
> 73,  Bill
> 
> P.S.  My note to Frank W3LPL:
> 
> Hi Frank,
>  
> The simple way to set Diversity is to first set up the Main RX exactly how
> you want it.  Then double-tap A>B which copies all settings to VFO B
> (single-tap just copies freq).  I like to equalize RF gains so I have my
> TX array on VFO A and Beverage on VFO B with ATT set for VFO A and PRE for
> VFO B (you can do this by going into BSET and separately setting PRE
> instead of ATT which was copied in the A>B above).  Then the two RF Gain
> settings should be reasonably close.  I also use the CONFIG: SUB AF
> Balance feature so my AF Gain tracks Main and Sub using the inner AF knob
> only. 
>  
> Once you have Main and Sub set up the way you want, HOLD SUB a LONG
> time...initially it LINKs the VFOs together and then it goes into
> Diversity (a flashing decimal point in the Main VFO readout indicates
> Diversity mode).  Then both RXs will track together with VFO A.  Then set
> SPLIT and now you can TX on VFO B with both RXs tracking in Diversity on
> VFO A.  This sounds complicated but I basically leave my rig set up in
> Diversity mode all the time.  Read below for how to easily go in and out
> of Diversity using the two antennas on Main and Sub:
>  
> http://n2.nabble.com/-K3--KRX3-Antenna-Flexibility-td1499595.html#a1500426
>  
> I'm surprised you don't find Diversity with the K3 to be much better than
> the MP on CW.  As I said above, I basically leave Diversity on
> continuously when on the low bands in CW.  I actually haven't operated the
> K3 much on SSB yet (...waiting for 10m to come back!)
> 
> (Note:  My last comment was in response to my misunderstanding what Frank
> actually said.  He said his K3 + Diversity was "vastly superior" to his MP
> on SSB, but he had not actually used Diversity on CW yet, since he just
> got his KRX3 going after the ARRL DX CW).
> 

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