[Boatanchors] Linear Tuning in VFOs -- SFW and SFL Variable Capacitors

[Al Parker]

Hi Bill,
	It's cuz some have PTO (permeability tuned) oscillators (usually a slug 
moving thru and inductor.) and some have capacitive tuned osc.    Drake 
has PTO's mostly, as does Collins, SP-xxx's, most if not all Halli's use 
a variable capacitor.
73,

Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 9/5/2022 1:11 PM, Bill Meara via Boatanchors wrote:
> Drake 2-B!  HT-37!  SP receivers!  HQ-100s   Why do some rigs have nice, linear tuning, while others havethe frequencies bunched up at one end of the tuning range? Enquiring hams want to know!
> https://soldersmoke.blogspot.com/2022/09/why-do-some-vfos-tune-more-linearly.html
> 
> 73  Bill N2CQR
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