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In the late 80's too. KB8AMZ

Well you will just have to fall back on your Chambers Seven Figure Mathematical tables.? Or perhaps you can get your hands on a Monroematic electric calculator or even one of those crank and shift

i suppose that RD16HHF1 are to be used. Some people experiment with RD15HVF1 too. They feel that 21 and 28 mhz performance would improve. but you might suffer poor performance at 80m band etc Regards

Hi Jerry, Thanks for the additional information. I've been reading many of your explanations of the interworking of the si5351 with interest. Especially the tidbit about it using a variable delay line

Hi. I'm thinking I'll make the board so it reaches all the way to the LPF relays. One end is supported by the connector and then you can just glue a couple of 12mm stand offs on the first and last

Sounds like the CEC firmware uses about the same math as the stock uBitx code: ? ??/g/BITX20/message/37973 What calibration does is to set the value of si5351bx_vcoa This is the

Regarding the new version 4 schematic: Do new components Q942 and Q952 connect in parallel with the IRF510's as per schematic or are?the RD15HV's meant to be used as an?*alternative* to the

The standard 8-way looms are colored per resistor code, 0 - 7. These correspond to pins 1 - 8 then 9 - 16. Smaller connectors similarly color 0? onward for numbers 1 up. I don't have a ubitx so I

Sorry, disregard. ubitx doesn't use the wiring looms. my bad ... :(

So I’ve actually done this… I used this SDR:? ?https://www.adafruit.com/product/1497? which tunes down to 24 MHz.? I tapped into the uBITx IF at TP14 on the rev4 schematic… before the 45 MHz

Holes in the corners for mounting… of course… ? *?* *Dr. William J. Schmidt - K9HZ*? ? *From:* [email protected] [mailto:[email protected]] *On Behalf Of* Nick VK4PLN *Sent:* Wednesday, May 30,

Hi, I only know about the CEC firmware. In that case it is the offset of the 25mhz crystal. The calibration number would be 0 if the 25mhz crystal was exactly correct. If you use the CEC uBITX

I'm constantly surprised at the interest in 10 meters. I always check 15. If its dead I go to 20. If it has anything on it I check 10 and hear nothing here in NC with a simple EFHW.. But 10 was a

I proudly display my Post bamboo slide rule along with the latest in Electronic and Radio engineering texts. The slide rule glass slide is cracked. Overheated during a physics final exam ;-) Mike

When setting the calibration, is the change from 0 absolute (based on the clock on the radiuno), or relative (based on the previous saved calibration? Or, if the calibration is set +1 for three

I have been working to keep the power transistors cooler.? Initally I added a 80mm fan to blow across the transistors and board.? When doing ft8 I would get significant heating of the power

If you have a dongle capable of direct sampling, or, an UpConverter you can tap the antenna between K1 and K3. This will give the dongle full bandwidth whereas KD8CEC's method presents only the IF

Its a bit confusing but the 5 pin connector which has yellow, orange, red, brown, and black wires is plugged into the connector on the bottom of the Raduino. This connector has 16 pins and only 5 are

Hi I could change it, but that would increase cost for end user, The LM324 are 50c the LM4562 are $5 each... Will there be a noticeable difference with a 700hz cw signal? 73

Nick looks great, and a good way to add mods to the uBITX would you consider a pair of LM4562s for the CW filter?...a little quieter, and would use the same R/C components BillK6SIK