Winding Coils for the BPF in PICaSTAR
Leonid, 4Z7LES, bought some Toko coils from ebay, quite cheap, in 100 off lots. These are the type with the larger cores (not the recommended 10K type by G3XJP for STAR) and it is interesting to see results that he has achieved. These coils do not have the segmented winding area but a single winding area on what appears to be a ferrite core. This is experimental at this time.
TOKO coils, eBay item 200825218793 at 18th Jan 2013 (US$18.00 /100 + $3.50 approx postage) May all be gone by now.
I take 3 coils randomly and build first filter from PIC-A-STAR. I'm make measure with 2 VNA's - NWT-7 and N2PK with TFT display. the result is not bad. Ireally don't know this topology, i'm use at most tubular, but is not so important now. why 20m? - because the coil's range (as received) is at middle of desired value. Tomorrow i will change the turns and winding coils to lower ranges. I send to you now all pictures and screen shoots.
18th Jan, 2012.
By the way, Leonid has an N2PK VNA fitted with a colour TFT display.
wide band sweep
This page created on 18th Jan 2013