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BITX40v3 on 160 M - Modification of the modified BITX80v3 to BITX160v3

 

So I have done some more experimenting and have managed to get the BITX40v3 I modified for 80 M to also work on 160 m .

It requires a total of 1100 pf additional cap across each of : c2 ,c4 and c6 in the BPF . It is not exactly a perfect bandpass match , but it works.

The TX LPF again did not need any modifications to get approx 6 wts into a 160 m dipole with a tuner . I am hoping some one has some ideas on an easy way to roll off the LPF ?just past 2 Mhz .

For 80 or 160 M conversion , you have to replace L4 in the VFO to a 3 - 7 uh adjustable coil and remove c94 if it is installed.

If you can reprogram the raduino to the proper VFO freq range required , that will work also .

As I have an early version that I have been experimenting with for 80 M , I just changed out the L4 coil for the moment

?My plan is to build a dual band unit for 80 and 160 once the 2 Raduino's I ordered show up .?

I have posted some videos on Facebook BITX40v3 site?

73s from Buzz
 

Hi Buzz

Try these LPF's. I am working on the 20m version. These are 7 pole filters opposed to the 5 pole stock version.

httpwww.kitsandparts.comlpf-inst.html

73

ken VA3ABN



On Mon, Feb 13, 2017 at 1:53 AM, VE7BEE <obeebe@...> wrote:

So I have done some more experimenting and have managed to get the BITX40v3 I modified for 80 M to also work on 160 m .

It requires a total of 1100 pf additional cap across each of : c2 ,c4 and c6 in the BPF . It is not exactly a perfect bandpass match , but it works.

The TX LPF again did not need any modifications to get approx 6 wts into a 160 m dipole with a tuner . I am hoping some one has some ideas on an easy way to roll off the LPF ?just past 2 Mhz .

For 80 or 160 M conversion , you have to replace L4 in the VFO to a 3 - 7 uh adjustable coil and remove c94 if it is installed.

If you can reprogram the raduino to the proper VFO freq range required , that will work also .

As I have an early version that I have been experimenting with for 80 M , I just changed out the L4 coil for the moment

?My plan is to build a dual band unit for 80 and 160 once the 2 Raduino's I ordered show up .?

I have posted some videos on Facebook BITX40v3 site?

73s from Buzz
 

Get rid of the http part in the link.

73
Ken

On Mon, Feb 13, 2017 at 1:53 AM, VE7BEE <obeebe@...> wrote:

So I have done some more experimenting and have managed to get the BITX40v3 I modified for 80 M to also work on 160 m .

It requires a total of 1100 pf additional cap across each of : c2 ,c4 and c6 in the BPF . It is not exactly a perfect bandpass match , but it works.

The TX LPF again did not need any modifications to get approx 6 wts into a 160 m dipole with a tuner . I am hoping some one has some ideas on an easy way to roll off the LPF ?just past 2 Mhz .

For 80 or 160 M conversion , you have to replace L4 in the VFO to a 3 - 7 uh adjustable coil and remove c94 if it is installed.

If you can reprogram the raduino to the proper VFO freq range required , that will work also .

As I have an early version that I have been experimenting with for 80 M , I just changed out the L4 coil for the moment

?My plan is to build a dual band unit for 80 and 160 once the 2 Raduino's I ordered show up .?

I have posted some videos on Facebook BITX40v3 site?

73s from Buzz
 

I've ?done some mods to my BFO, I had originally used the Raduino VFO, But bought a SDR kits VFO, The only problem ?was the SDR kits VFO flipped the LSB to USB and no matter what I tried in the programming it wouldnt flip back , So I replaced the BFO crystal with a 11.9 MHz one I had in my box of Bits, This then gave LSB again, I then added d a ?small trimmer cap in series but made it switchable with a transistor ?so I could switch back and forth modes ... ?job done LSB and USB, So far I have continuous coverage from 1.8 MHz to 7.5 MHz ...I to have to make a few Bandpass filters and a Few lowpass filters but the SDR kits VFO has provision to slow relay switching on different bands so this ile use to switch the Bandpass and low pass filters...?

Marc 'Gw0wvl' ..


On Mon, 13 Feb 2017 at 6:53, VE7BEE
<obeebe@...> wrote:

So I have done some more experimenting and have managed to get the BITX40v3 I modified for 80 M to also work on 160 m .

It requires a total of 1100 pf additional cap across each of : c2 ,c4 and c6 in the BPF . It is not exactly a perfect bandpass match , but it works.

The TX LPF again did not need any modifications to get approx 6 wts into a 160 m dipole with a tuner . I am hoping some one has some ideas on an easy way to roll off the LPF ?just past 2 Mhz .

For 80 or 160 M conversion , you have to replace L4 in the VFO to a 3 - 7 uh adjustable coil and remove c94 if it is installed.

If you can reprogram the raduino to the proper VFO freq range required , that will work also .

As I have an early version that I have been experimenting with for 80 M , I just changed out the L4 coil for the moment

?My plan is to build a dual band unit for 80 and 160 once the 2 Raduino's I ordered show up .?

I have posted some videos on Facebook BITX40v3 site?

73s from Buzz
 

Has any one played with extending the raduino freq range ? Would like to unlock it and see what it can do .
 

Try these guys

and instructions for bands from? 2,200m to 6m

At $4.60 it's hardly worth the effort of making it yourself!!

--
73 de Noel, ZL1NC

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