Date   
Re: high pitched wine on 80 and 40 M

jfein2000@...
 

Thanks Dave and John.  Yes I think the BFO was the issue. Actually got onto that  a few days ago.    Also found if I turned on the attenuator and it went away.  Reset the BFO and seems ok now.  I do notice that it is not very sensitive on receive compared to any of my other radios.  Wonder if that is just how it is? 

cheers Jeff VK3GMO
 

 

 

Re: Nearly non-existent output power, no mod

 

Hi Barry,

Why was your nano selecting the wrong filter?  This doesn't seem like a typical problem -- at least I've not seen a lot of such reports here.  Were you using factory firmware, or something else?

73,


Mark.

Re: [QRPp-1Watters] My 5W30 is Lonely

Jack, W8TEE
 

As fate would have it, I got an email from HF today and the case is on sale:

Inline image

Jack, W8TEE


On Saturday, August 31, 2019, 10:30:23 AM EDT, Jack Purdum <jjpurdum@...> wrote:


I've built the new 5 Watter that Diz is selling and wrote an article on it which should be coming out in CQ in Nov (I think?). The thing I noticed most about the rig is how quiet it is compared to some other QRP rigs. These photos show the board and how I mounted it:

Inline image
Note that there are 4 SMD's on the board, 12 cores, and a bazillion bypass caps. I "doubled" the heat sinks just because I had them laying around.
Inline image

I put it in an Apache case from Harbor Freight ($10 on sale) which is water tight. Because I bring all connections out through the top panel, there are no holes in the case so when I drop it in the lake, I should be able to retrieve it before it takes on any water. Also, I could probably drive over it with my car...it's pretty rugged. By cutting the foam inserts that come with it, I can pad paddles, ear buds, and antenna in the case. When I get around to a custom battery pack, that should fit in, too.

Jack, W8TEE


On Saturday, August 31, 2019, 9:40:21 AM EDT, Colin Evans <colin.evans2@...> wrote:


Hi Curt,

I built 1W40 s/n#939 early last year. I found the trimmer caps were very jumpy during TX alignment and swapped them out. With the new trimmers, TX alignment was much easier. I struggled with the TX/RX shift, it took some work to get right. I've had a couple of contacts on the 1W40 but I'm still not confident that it's 100%.

I built a bare bones 5 watt amp from Diz, I left out the VSWR circuitry, just put in a low pass filter. Unfortunately I didn't bridge the output from the amp to the low pass filter - the instructions at the time assumed that the VSWR circuit would be in place. Diz later amended the instructions after I mentioned my mishap. Upon first fire up, the amp popped both of the PA transistors instantly. I couldn't find replacement transistors over this side of the pond, so I bought a pack of 10 transistors from Diz. To make the shipping cost easier to swallow, I opted to buy a 1W30 kit at the same time.

The 5 watt amp works nicely now that the output is properly connected, it's permanently connected to my 1W40.

The 1W30 kit was in storage as I moved QTH last October. I've now got a purpose built shack at the new QTH, so a few weeks ago I started building the 1W30. Again, when it came to TX alignment, I found that the trimmers were very jumpy, it was very hard to find the peaks. I still had some trimmers left from the 1W40 build, some I put them in to the 1W30 - alignment was then easy.

I've had 1 QSO on the 1W30 so far, just as a PCB on the bench, it seems to work fine. I'm currently home brewing a case, although yesterday I broke the mandrel for my nut riveter, so I'm waiting for the mail man to bring me another. I use rivnuts to hold my cases together neatly. I'm hoping to use the 1W30 barefoot for SOTA, so it needs to be in a decent case.

So, that's the update from me, I have 2 rigs, #939 & #979. I have it in mind to put the 1W40/5W on air soon, it's built into a wooden box, paraset style with EFHW tuner, I need to modify it a bit to get at the 50R unbalanced output, then I will be able to hook it up to the shack antenna.

73,

Colin,
M1BUU
IO84
Yorkshire

On Sat, 31 Aug 2019, 13:52 Curt, <rhulett1@...> wrote:

Am having some success with the 5W30, but haven’t seen any 1W30 or 5W30 post QRV.  Hope maybe some others will become active soon.  I try to post on the QRV page and generally near 10.118-10.120.

 

Curt KB5JO

 

Sent from Mail for Windows 10

 


*** Manage your QRPp@... options at http://1watters.com/mailman/listinfo/qrpp_1watters.com ***

Fw: [BITX20] Nearly non-existent output power, no mod

Ted
 



----- Forwarded Message -----
From: "k3rta@..." <k3rta@...>
To: "BITX20@groups.io" <BITX20@groups.io>
Cc:
Sent: Sat, Aug 31, 2019 at 21:33
Subject: Re: [BITX20] Nearly non-existent output power, no mod



On Sat, Aug 31, 2019 at 9:22, barry halterman
<kthreebo@...> wrote:
You might have an issue with your nano not selecting the appropriate filter, i.e., one filter is always selected regardless of the band. Check the relay drivers to verify the correct band is selected. 
I had a similar problem with my V4 board, with exactly the same condition you described.
Barry
K3Bo

On Sat, Aug 31, 2019, 2:07 AM Mark - N7EKU <n7eku@...> wrote:
Hi,

I would bet it's the finals. Order some from a reputable company e.g. mouser, arrow, or digikey. They get hot because the drive is turning the on, but they can't make RF efficiently so not much comes out. 

73,


Mark

Re: Nearly non-existent output power, no mod

Ted
 




On Sat, Aug 31, 2019 at 9:22, barry halterman
<kthreebo@...> wrote:
You might have an issue with your nano not selecting the appropriate filter, i.e., one filter is always selected regardless of the band. Check the relay drivers to verify the correct band is selected. 
I had a similar problem with my V4 board, with exactly the same condition you described.
Barry
K3Bo

On Sat, Aug 31, 2019, 2:07 AM Mark - N7EKU <n7eku@...> wrote:
Hi,

I would bet it's the finals. Order some from a reputable company e.g. mouser, arrow, or digikey. They get hot because the drive is turning the on, but they can't make RF efficiently so not much comes out. 

73,


Mark

.

Ted
 



Re: SSB exciter with digital audio phasing

Sandeep Lohia
 



On Fri 30 Aug, 2019, 12:39 PM Nigel G4ZAL, <nigel@...> wrote:

Sandeep,
How much for one of your spare JA2NKD analyzer PCB?


Here, I distributed most as free gift...
& to those who insist...
 in approx $ 1/- each 
+ shipping/packaging...

some modifications have been made by me in both analogue and digital part...
 2 outputs of DDS output have been combined for 50 ohm out...
& as to cancel some harmo, if any...

my PCB also has provision for external high Q 30 MHz LPF, beyond this is not my frequency of interest...

SNA is 100% functional, modular basis, & all issues fixed...
& has numerous functions :

unknown Ferrite quality of Torroid test, 
Dip Meter, 
SWR test, 
BJT's FT, 
RF power Meter, 
BPF, LPF , ladder filter,
can measure till -80dBM.
Coax velocity & many many other functions...

in details, those needed for brewing...
more technical discussion can be done in Telegram here :

PM me your address... Nigel
HAPPY HOMEBREWING 🙏🏻 73's



I just finished breadboarding JA2NKD's analyzer and it works good.

My email is OK on here and on QRZ.com

Sorry to the OP for going off topic...

Nigel - G4ZAL

On Fri, Aug 30, 2019 at 05:25 AM, Sandeep Lohia wrote:

even I made one of his project :
& still have some spare PCB
 
 

Re: Nearly non-existent output power, no mod

barry halterman
 

You might have an issue with your nano not selecting the appropriate filter, i.e., one filter is always selected regardless of the band. Check the relay drivers to verify the correct band is selected. 
I had a similar problem with my V4 board, with exactly the same condition you described.
Barry
K3Bo

On Sat, Aug 31, 2019, 2:07 AM Mark - N7EKU <n7eku@...> wrote:
Hi,

I would bet it's the finals. Order some from a reputable company e.g. mouser, arrow, or digikey. They get hot because the drive is turning the on, but they can't make RF efficiently so not much comes out. 

73,


Mark

Re: Nearly non-existent output power, no mod

 

Hi,

I would bet it's the finals. Order some from a reputable company e.g. mouser, arrow, or digikey. They get hot because the drive is turning the on, but they can't make RF efficiently so not much comes out. 

73,


Mark

Nice to know ..... my Raspberry switch

Johan Holstein
 

Re: SSB exciter with digital audio phasing

Glenn
 

There's an interesting series of youtube videos on a Phasing rig here https://www.youtube.com/watch?v=Xg-rBwnkkBc
The link is his last current video, there are several in   his series.

Charlie is using a Teensy to do the grunt work I understand.

vk3pe

Re: Nearly non-existent output power, no mod

Ted
 

Raj,

I'll take a look at D1 & D2.


Mark,

I don't recall the source though I've picked up two different batches off the Bay over time. I know eBay sources are to be distrusted, though the ones I've used so far at least work.

-------------------

The curious thing is that the heat sinks are getting plenty hot. Something's making power but where is it going?  I now get maybe a watt out on 80, 40, and 30; up to maybe 2 on 20, then about nothing on 17 and 15.  The LPF relays get coil voltage seemingly [only] when they're supposed to have it.

I swapped out K3 (t/r relay) out of frustration, so at least it's now color-coordinated with the rest of the Axion blocks in that row :)   

I'll look at Raj's idea and come back.


Thanks, all.

Ted
k3rta

Re: Nearly non-existent output power, no mod

 

Regardless,

The problem wouldn't be with the mic element as Ted gets almost no power out on CW either.

73,


Mark.

Re: Raduino 4 Line Single Sided PCB boards

efkleas@...
 

Hi
I would like to try this pcb. Do you have sprintlayout file?
Thanks in advance
SV1CRN

Re: high pitched wine on 80 and 40 M

_Dave_ AD0B
 

I had that whine occur on a V4 uBITX that I purchased used. It was also fairly deaf.  The solution was to change the bfo frequency to stock. It was about 2 kc off. It works well now. 
--
73
Dave
k0mbt
http://veloliner.com/ham/k0mbtkey.pdf

Re: Nearly non-existent output power, no mod

_Dave_ AD0B
 

iz-ooz
I have not looked at the values of the feed resistors but they are stock and the radios have been picked up from various sources.

I have replaced the elements from various sources as well. Some come from used telephones, others were purchased on ebay for cheap. I think I got 7 of them and have only 2 left. None of the original mic elements are still working. 

Perhaps there is something about my grounding or other issue that affects the mics. Might be a topic for another thread. 
--
73
Dave
k0mbt
http://veloliner.com/ham/k0mbtkey.pdf

Re: Nearly non-existent output power, no mod

iz oos
 

That's very strange you changed so many mic elements. I haven't used that as much as you but I thought an electret could last decades. Are you sure the resistors supplying the elements have the correct value?


Il 30/ago/2019 15:27, "_Dave_ K0MBT" <davesters@...> ha scritto:
The times that I have lost ssb output Ted, the mic element has gone bad. They seem very fragile but work good when they work. Probably gone though half a dozen in two years of running 4 uBITX and one BITX40 radios.

Will see just what you did a bump in the power when keyed. 
--
73
Dave
k0mbt
http://veloliner.com/ham/k0mbtkey.pdf

Re: Nearly non-existent output power, no mod

_Dave_ AD0B
 

The times that I have lost ssb output Ted, the mic element has gone bad. They seem very fragile but work good when they work. Probably gone though half a dozen in two years of running 4 uBITX and one BITX40 radios.

Will see just what you did a bump in the power when keyed. 
--
73
Dave
k0mbt
http://veloliner.com/ham/k0mbtkey.pdf

Re: SSB exciter with digital audio phasing

Miguel Angelo Bartie
 

Hi

I am with problems in my web site.
So I post the SSB exciter in the group files
https://groups.io/g/BITX20/files/py2ohh

dspicssb.rar

This exciter replaces a PC in SDR transmitters.
I make a hex file for the dspic ...using mplab and pickit3 ...take care about the dspic ...it has a lot of this family name look at the same name. I am working to write a new page that I am explain how to program the dspic.

73 from py2ohh miguel

New file uploaded to BITX20@groups.io

BITX20@groups.io Notification <BITX20+notification@...>
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20@groups.io group.

File: dspicssb.rar

Uploaded By: Miguel Angelo Bartie

Description:
SSB exiter HF to 80m with digital phase shift ...replace a PC in SDR transmitter.

You can access this file at the URL:
https://groups.io/g/BITX20/files/py2ohh/dspicssb.rar

Cheers,
The Groups.io Team