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Multiband bitx

 

I am also looking for a Multiband hf transceiver kit but with no luck, can anyone out help...
 

If you don't want BITX ebay SSB 6.1

On Thu, Oct 26, 2017 at 9:59 PM, n8iov via Groups.Io <n8iov@...> wrote:
I am also looking for a Multiband hf transceiver kit but with no luck, can anyone out help...


 

I looked around some on the interwebs, not impressed by the ssb6.1
Be aware that you are buying exciter and ?vfo and linear and lpf's separately.
And that instructions are pretty much non-existent.

Easier and cheaper to take a bitx40v3 from hfsigs, remove the bandpass filter at L1,2,3
and lowpass filter at L6,L7. ?Replace them with plug in modules.

Maybe make the bandpass filter a variable preselector instead:
/g/BITX20/topic/6212787#33783

Then hack Allards code to move the VFO around for the different bands.
Several here have hacked the bitx40v3 for 20 and 80. ?
And lots of bitx kits out there for sale with filters fully described.
??


Or be one of the first to build the ubitx:
/g/BITX20/message/33255
/g/BITX20/topic/4438163
/g/BITX20/message/33953


Jerry


On Thu, Oct 26, 2017 at 01:34 pm, Lawrence Galea wrote:
If you don't want BITX ebay SSB 6.1
?
 

And the LPF's a lump in your antenna feed.
No bandswitches.


On Thu, Oct 26, 2017 at 05:53 pm, Jerry Gaffke wrote:
Maybe make the bandpass filter a variable preselector instead:
/g/BITX20/topic/6212787#33783
 

OK, these instructions for the ssb6.1 are quite good, if a bit daunting.

Written by customers:


http://img.banggood.com/file/products/20160921230039Final-Version-of-SSB6.1-Build-G0CWA.pdf


On Thu, Oct 26, 2017 at 05:53 pm, Jerry Gaffke wrote:
I looked around some on the interwebs, not impressed by the ssb6.1
Be aware that you are buying exciter and ?vfo and linear and lpf's separately.
And that instructions are pretty much non-existent.
Dimitar Pavlov
 

this is very offtopic questions, but if You make a search in ebay You will found -
ssb 6.1
klopik
Dean Kurniawan - bixen
2-3 sdr transceivers
and many others
also in google You will found again many others (and uBitx).



On Thursday, October 26, 2017, 11:00:12 PM GMT+3, n8iov via Groups.Io <n8iov@...> wrote:


I am also looking for a Multiband hf transceiver kit but with no luck, can anyone out help...

 

I am going to be using the bitx for digital sstv and other digi modes back pack operation? ?
 

There are 3 facebook groups for the 6.1.
It needs a linear amplifier of your choice with the obvious LPFs.
But it is not a bad choice if you want a multiband cw / ssb xcver.
Your choice if you want the 6.1 or a multiband BITX.
Regards
Lawrence

On Fri, Oct 27, 2017 at 1:52 PM, KC2UKU ED via Groups.Io <n8iov@...> wrote:
I am going to be using the bitx for digital sstv and other digi modes back pack operation? ?
Gordon Gibby
 

¿ªÔÆÌåÓý

?By itself, it seems to have some MOSFET output-? ?what exactly is the power output of the bare system???


Thanks,

gordon



From: [email protected] <[email protected]> on behalf of Lawrence Galea <9h1avlaw@...>
Sent: Friday, October 27, 2017 8:09 AM
To: [email protected]
Subject: Re: [BITX20] Multiband bitx
?
There are 3 facebook groups for the 6.1.
It needs a linear amplifier of your choice with the obvious LPFs.
But it is not a bad choice if you want a multiband cw / ssb xcver.
Your choice if you want the 6.1 or a multiband BITX.
Regards
Lawrence

On Fri, Oct 27, 2017 at 1:52 PM, KC2UKU ED via Groups.Io <n8iov@...> wrote:
I am going to be using the bitx for digital sstv and other digi modes back pack operation? ?
 

A couple more threads on multibanding the bitx and friends:
/g/BITX20/message/17931
/g/BITX20/topic/4245427

HFSigs gets their toroids for the bix40v3 from Diz, he also sells "filter kits":




All of these are 50 ohms in and out, so if the coils and caps can deal with the currents and voltages?
at the power level of your transmitter, then should work fine on the bitx or ubitx.

The WA2EBY toroid kit is very cheap at around $6 USD for a set of LPF's on all the HF bands,
suitable for up to 40w out. ?Being low pass filters, they knock out all the harmonics present
in the transmitter's output due to distortion in the power amplifier, but don't touch anything?
lower in frequency. ? So if using LPF's for the transmitter we still want a band pass filter for the
receiver. ?Removes local AM broadcast stations from the receiver front end, for example.

The other two are band pass filters, so they can knock out any signals above or below,
coming in or going out. ?More parts than a low pass filter so the toroid kits are more expensive.
But with this approach you might get by?with just the lump in the antenna lead,
and could do without the ?BFP and LPF inside the bitx40. ?When switching bands,
you swap out the filter inline with the antenna and tell the vfo where to go, that's it.
Especially convenient if you have different antennas for different bands anyway.
Replacing the bitx40v3's BFP with a tunable preselector for receive would allow using the
the cheaper WA7EBY LPF kit since it only needs to clean up higher freq transmitter harmonics.

Given the IF at 12mhz and either a high side or low side vfo, there may be receiver birdies and
transmitter spurious emissions sneaking through even with the best of bandpass filters at the antenna.
You should have some way to evaluate the transmitter for clean emissions when developing a scheme
to move the bitx40v3 to a new band, perhaps using a cheap rtl-sdr plus downconverter.

Be sure to use quality caps rated for several hundred volts, perhaps type c0g.

Jerry, KE7ER



On Thu, Oct 26, 2017 at 06:17 pm, Jerry Gaffke wrote:
And the LPF's a lump in your antenna feed.
No bandswitches.
. . .

?


On Thu, Oct 26, 2017 at 05:53 pm, Jerry Gaffke wrote:
Maybe make the bandpass filter a variable preselector instead:
/g/BITX20/topic/6212787#33783
 

I have been looking at either making my bitx multi-band or buying from Ham Builder but I haven't any experience with them and not sure of their quality.

?

GL let's us know what you find.


73
? David?
? ? ?N8DAH
 

The two bandpass toroid kits are using larger toroids, either for higher transmit power
or for better linearity on receive to ignore very strong nearby signals.
That helps explain the higher price, could be redesigned to use smaller toroids.


On Fri, Oct 27, 2017 at 05:14 am, Jerry Gaffke wrote:
The WA2EBY toroid kit is very cheap at around $6 USD for a set of LPF's on all the HF bands, suitable for up to 40w out. .... ? The other two are band pass filters, so they can knock out any signals above or below, coming in or going out. ?More parts than a low pass filter so the toroid kits are more expensive.
 

What about using something like SDRPlay's RSP1 as RX for anything you'd like to listen to, then build or modify BitXs to TX on whatever bands and modes you'd like?

Kinda old school to consider separate RX and TX rigs.

My newbie impression is that improving RX takes money and technical sophistication, while a functional TX can be simple and inexpensive, and is basically antenna limited?

I can imagine that an ICOM 7700 is way better at RX than a BitX (not there is anything wrong with that; always fun to squeeze out the best of a piece of equipment), but I can't see how TX would be better in any practical sense, given equal power and antenna.
 

What about the G6LBQ multiband bitx? That design looks pretty cool. The bandchanging looks really efficient.
73 de Chas ai4ot

Sent from my iPhone
 

Nothing wrong with separate Rx and Tx, my secret passion and love for
awhile. If you aim for CW you can even build a separate electronic TR
switch like the "Magic Box" (kit discontinued) or the electronic TR
switch from KC9ON ($8 kit, $13 assembled) or home-brew. - Rich WB2GXM

On 10/27/17, Arvo KD9HLC via Groups.Io <arvopl@...> wrote:
What about using something like SDRPlay's RSP1 as RX for anything you'd like
to listen to, then build or modify BitXs to TX on whatever bands and modes
you'd like?

Kinda old school to consider separate RX and TX rigs.

My newbie impression is that improving RX takes money and technical
sophistication, while a functional TX can be simple and inexpensive, and is
basically antenna limited?

I can imagine that an ICOM 7700 is way better at RX than a BitX (not there
is anything wrong with that; always fun to squeeze out the best of a piece
of equipment), but I can't see how TX would be better in any practical
sense, given equal power and antenna.
 

Link?

On Oct 27, 2017, at 1:06 PM, alphaindia4oscartango via Groups.Io <alphaindia4oscartango@...> wrote:

What about the G6LBQ multiband bitx? That design looks pretty cool. The bandchanging looks really efficient.
73 de Chas ai4ot

Sent from my iPhone
 

Yeah, I kinda operate under "What will this spend allow me to do that I can't do before?"

I've got the Bitx on 40M.? So far I've picked up a guy 60 mi west of me around Champaign IL.? I really would have liked to looked at ALL the traffic on 40M.? One of our own had a contact with Antarctica.? How cool is that?

I am a noob, so it someone can pry me out of RX is way harder than TX I would very much appreciate it.
 

One thing that the $59 bitx40 can do is give you a reason to tinker and learn if so inclined.
Most of us would not consider popping the lid off an Icom IC-7851, let alone go at it with a soldering iron.

Receivers are hard because they have to receive both that signal from Antarctica and a signal from down the block.
Much of the receiver (from antenna up into the crystal filter) has to be able to handle both simultaneously,
and let you hear only the weak one. ?Which is to say, a receiver should have an incredible dynamic range.

Transmitters are hard because it's so embarrassing when you mess up.
At least for some of us.

Very important to get the antenna right when operating at 5w.

Jerry, KE7ER



On Fri, Oct 27, 2017 at 02:49 pm, Arvo KD9HLC wrote:
Yeah, I kinda operate under "What will this spend allow me to do that I can't do before?"

I've got the Bitx on 40M.? So far I've picked up a guy 60 mi west of me around Champaign IL.? I really would have liked to looked at ALL the traffic on 40M.? One of our own had a contact with Antarctica.? How cool is that?

I am a noob, so it someone can pry me out of RX is way harder than TX I would very much appreciate it.

?

?
 

I show how I've added a second BPF on my blog:?

In a follow up post I showed how to add a second LPF as well. Only problem is that after much testing I've found it doesn't work well. I have redone it as shown here with a socket compatible with the QRP Labs filters:




I even went so far as to rebuild the original Bitx40 LPF on a a board and reinstall it. I'm going to do the same with the BPF section of the circuit (make it pluggable, single band) and just move filters around to get to the band I want. I could probably do mass amounts of switched BPF/LPF's if I wanted, but I actually don't want. I'm going to modify my case so that the top comes off easily and I can change bands in under a minute. To me that seems like good enough without getting crazy. Dual band would be nicer, but this is plenty sufficient.

--
Ryan Flowers W7RLF

?

?<-- Learn how to go digital on the BITX40

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