Hi,

It appears that the design is for a dynamic mic as I didn't find any bias resistor 10O on the active track of the Lay file. Perhaps we may include one with PTT switching facility? preventing mic bias when PTT is OFF.? Please consider a mod .

?regards

?sarma

?vu3zmv

Hey Ken , did your friend ever come up with the filter list for the different bands ?

Buzz VE7BEE

I agree with Mark . Good price , the fact that you can buy the Raduino separately and at only $25 shipped ? Great deal .

And don't rock the supply chain for the rest of us guys by keep bringing it up ( 4 times ) . ?Just pay the difference it is less than $10 bucks and move on .

My BITX40 Arrived INDIA to KANSAS 20 days 1/3 to 1/23. The BITX40 was my Show & Tell at the W0VFW club meeting last night. I played W5KUB's video of his BITX40 QSO- Tennessee to South Africa. In my 1st post, I mentioned these 2 items WORTH LOOKING IN TO:

Electronic Plastic Shell Cartridge Handle Project Case Desk Instrument 200x175x70mm

$9.99 USD free shipping Ordered 1/3 arrived 1/20 China to Kansas

http://www.banggood.com/Electronic-Plastic-Shell-Cartridge-Handle-Project-Case-Desk-Instrument-200x175x70mm-p-1035473.html

HM100N-Microphone-for-Mobile-Radio-F121-F221-F521-F621-F5011-F5021-F1721
Shipped was an ICOM HM-118N microphone with up-down buttons.
$9.95 USD free shipping. Ordered 1/3 arrived 1/14 China to Kansas
http://www.banggood.com/HM100N-Microphone-for-Mobile-Radio-F121-F221-F521-F621-F5011-F5021-F1721-p-1115478.html

I have posted pictures of the PROJECT CASE with BITX40 preliminary placed inside case for sizing? and the ICOM $9.95 Microphone. I now have $79 in my project.

MY PICTURE ALBUM IS----- W8LM BITX40 + RADUINO? Click on PHOTOS on the left to view 6 pictures.

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To HF SIGS ?: Your customer service is good , the product is good , the price on the BITX board is good .

THANK YOU for offering us QRP ham guys , the ones that believe in your project , that had already bought the BITX40v3's some time to buy the Raduino's at $14 usd.

As everyone knows this does not even cover your cost for the product including shipping and handling . If some one missed it , Oh well it is still ONLY $25 bucks.

The fact that you will sell the Raduino's separately , and at only $25 usd incl shipping is amazing to say the least .?

I think every ham should be thanking your team for your efforts and the great work you have done to help move the qrp radio hobby forward in such a positive way .?

To those that are so "concerned" about the $9 us difference in price on the Raduino's ( which is less 2 drinks at Starbucks )

Give all the rest of us guys that like experimenting a break , all us hams that are THANKFUL for what the HF Sigs team and Ashhar are doing , who they are helping and what products they make available at a reasonable price . Do us all a favour , ?drink 2 less Starbuck Lattes or 2 less beers this week and just pay the difference and be quiet .

Thanks to all that support and share all the BITX info and products - VE7BEE

One issue with adapting the Bitx40 for use as a general coverage receiver is that the IF at 12mhz is sitting right in the middle of some interesting radio spectrum. ?We could get around this by making it a double conversion receiver. ?I'm thinking we replace the 40mhz BPF on the Bitx40 with a small pc board. ?The board has a 30 mhz low pass filter, a mixer, an RF amp, and a 45 mhz band pass filter. ?Should be able to use a spare channel from the Si5351 to drive the mixer. ?I'd expect this to work fine to receive from DC to 30 mhz.

That's been designed already using about $5 worth of parts, just borrow the front end from this: ???

Jerry, KE7ER

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Two switches.

Note that the junction of C6 and C7 is floating for DC. ?So one bandpass filter has a 10k resistor to gnd, and one has a 10k resistor to 5v. ?The main board has a third 10k resistor to one of the Raduino digital input pins. ?Could go into a Raduino ADC input and distinguish between as many bands as you want, each having a different dc voltage across two resistors between 5v and gnd.

Of course, that's about the worst possible point to be injecting hash from the Raduino. ?Better take care with bypass caps and such. ?Might be better still to add an extra cap at the output LPF, and carry out this scheme over there.

I assume we're talking DPDT switches, you want to switch both ends of each filter. ?They do make 3PDT slide switches, so another option would be to use the third pole over at the LPF for the logic level into the Raduino.

Jerry, KE7ER

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Hi Larry,

At the time I modified the code I hadn't found the notes about the change needed to accommodate the newer '5351 code - it seems as though there is (or was) no obvious, single FAQ-type of document on the "hfsigs" site or in this group's archives (the Wiki is still empty!) so it took a lot of reading of past message just to put the various bits and pieces together before I got the sketch to compile properly.? Still, not too bad for 1-2 hours' work and scattered documentation!

About the 2nd line being "garbaged up", I never had that problem, at least when using? < Version 2 '5351 code:? One would think that the generic LCD functions would be reasonably robust - unless there's some sort of blocking going on in the background.

I've been fighting my 3D printer when trying to print an ABS box for the radio, so that - and a few other projects - must be done before I can get time to put the radio on the air:? Too many projects, too little time!

TNX for the comments and 73,

Clint

KA7OEI

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