[ARC5] 10 meter BC-454

[WA5CAB at cs.com]

L2 is untuned and should be self resonant well above 30 MC.  If you pad it 
down to be resonant at say 29 MC and you want the receiver to tune 27 to 30, 
sensitivity will peak at 29 and fall off substantially in both directions.

Unfortunately, the RAT and RAV manuals do not give the capacitance range 
for the tuning capacitor main sections or the turns in the coils for the 46109 
(20-27 MC) which would have been a good starting point.

Say again the number of turns in L1, L3 and L5.  I take it that you 
confirmed that the slugs were still in all of the coil sets.

In a message dated 02/06/2013 23:02:10 PM Central Standard Time, 
kgordon2006 at frontier.com writes: 
> Boy! What a mess!
> 
> Tentatively, it looks as though the main tuning capacitor tunes from about 
> 22 
> pfd to 11 pfd, lock-to-lock.
> 
> It looks like the RF amp plate inductor needs at least 45 pfd in parallel 
> with it 
> in order to tune to around 29 MHz. Or the inductor needs to be reduced 
> from 
> 9 turns of #36 wire to 7.
> 
> The mixer-grid circuit, which now tunes from 60 to 83 MHz, needs both 
> added capacitance and added inductance to tune 28 to 30 MHz.
> 
> Balancing that out is requiring many iterations of calculations.
> 
> What a PITA...
> 
> Kenneth G. Gordon W7EKB
> 

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480