"Henry Kolesnik" wrote in message
m...
TRFs are nice receivers, I had several back in the 1950s becasue that's
all
I could find for free or next to nothing. The problem with a tuneable TRF
is that the bandwidth increases as you tune to higher frequencies. BW=f/Q
with Q being relatively constant over the BCB. Since you seem to have a
passion for a fix tuned TRF I'd suggest using old IF transformers for your
coils. It should be relatively easy to remove turns to get the freq up.
Some receivers, particularly military ones were made with IFs in the BCB.
The BC-454 that covered 6 to 9 Mcs had an IF of 1415 Kc. ******
The BC-348 has an IF of 915 Kc and the BC-312 and BC-342 also
skipped the BCB but I can't recall their IFs but I'll bet Google will find
em.
Scour the hamfests and you'll find plenty but prices are going up.
If you can find a BC-946 you'll
have a gem for a BCB Rx.

*******
Sorry to disagree but:
R27/ARC5 - BC 455 (6-9 megs) IF = 2.830 megs
R26/ARC5 - BC454 (3-6 megs) IF = 1.415 megs
R23/ARC5 - BC453 (0.19 - 0.5 megs) IF = 0.085 megs (85 kcs.)
R25/ARC5 (1.5 - 3.0 megs) IF = 0.705 megs (705 kcs)
R24/ARC5 (0.52 - 1500 megs) IF = 0.239 megs (239 kcs)
This from info that J. Gibson was most kind to send me.
Terry