Spending a few $ on wireless cards for the computers and using the bedroom media computer as firewall/router with the cable modem stuck inside the case got rid of most of my domestic birdies. 2 Gigabit hubs will be on Ebay soon...
I teat the "textbook" like a recipe book, gives a starting point but often needs some adjusting. Just for grins I did hook the preamp to the 4 turn coil. The resonant freq, with 1V at the varactor junction, about 520pF, Is about 530KHz instead of just above 540. Signal strength with biasing the same was about 6Db down going by the S-Meter on a strong station with attenuation set the same. Might just use it that way since the lower input EMF is less likely to cause intermod problems and the preamp has plenty of gain to spare.
Less interaction probably because of the Bazillion Ohm input impedance vs. the 50 Ohm feedline impedance usually used. At 9V it still tops out at about 1650KHz.
Still waiting on back ordered parts to finish the mods to my receiver, hopefully I'll have them before next winter...
On 4/10/2011 14:48, Russ Edmunds wrote:
If the "textbook" number of turns on a given size frame is x, and you use a two turn link/pickup coil ( which is the usual number ) you will now have "x + 2", and may need to reduce the number of turns needed in order to reduce the "L". That will be pretty obvious as the loop won't tune the whole band. If x = 10, then using a link/pickup coil, you will likely need 8. One of mine is amplified with a dual-balanced FET amp ( 2N4416's IIRC ), and it is directly coupled. When I used it unamplified, I added a two-turn link coil, and had to reduce the main/tank coil accordingly. I never tried using a link coil with an amplifier. Russ Edmunds 15 mi NNW of Philadelphia Grid FN20id <wb2bjh@xxxxxxxxx> FM: Yamaha T-80& Onkyo T-450RDS w/ APS9B @15'; Grundig G8 AM: Modified Sony ICF 2010's barefoot --- On Sun, 4/10/11, Tim Hills<thills@xxxxxxxxxxxxx> wrote:
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