Count me in on 2 please

Regards martin?

VK6FEEE

Hi Bill,

I have a stock Bitx 40 waiting for me to get back into the shack to mod.

My other hobbies are taking my time ... well that and work :-)

I also have one of Jacks boards and ordered an other board last night.

Just waiting on the final parts to get to work.

I thought I would stick my oar in, because I will want the next boards

being developed, so while I will not be ordering this way this time,

I will in future.

Thanks for working this our for us !

Best wishes

Andrew VK6WAM

On 12 June 2017 at 06:50, William R Maxwell <wrmaxwell@...> wrote:

Over the past 24 hours, Jack and I have been in contact off-group about the possibility of setting up a VK source for the W8TEE BITX40 VFO etc pcb, one that could also be accessed by our cousins in NZ.

I am pleased to advise that Jack and I have been easily able to reach agreement. As a result, I will buy a quantity of boards from him at US$7.50 each, plus shipping on whatever quantity I end up ordering. In turn, I will make the boards available to builders here downunder at their cost to me. In other words, the individual board price will be based on equally sharing my costs by simply dividing my total payment to Jack by the number of boards involved.

The price to each participant will then be that unit price per board, plus the actual costs of my posting the order to the builder. Obviously, the final cost will depend upon how many boards the builder requires and the postage cost to that address from VK7 but we confidently predict that ther will be a saving on the cost of ordering directly from Jack. Fortunately, the Australian customs declaration is comparatively simple document and there is never a queue at my local Post Office and we have a free trade agreement, so ZL orders won't be any hardship at this end.

I am travelling over the next 3 days but will reach my home QTH on Wednesday 14 June. I hope to be able to place the order with Jack within a day or so of getting home. If you would like to take part in this group buy please email me direct at vk7mx@wia dot org dot au, removing the spaces and the dots, obviously.

I intend to buy a few spare for future builders, so don't be too concerned if you come across this post later than 14 June.

73

Bill, VK7MX & VK1MX

--

A blessing on your days. A blessing on your life. A blessing on the land.

You're probably right.
So Matt's TX rail probably never saw power during the mishap, and none of those parts behind it got damaged.
We're assuming it was a battery lead reversal that blew D7.
?
?

On Sun, Jun 11, 2017 at 08:49 pm, Raj vu2zap wrote:

The relays are polarized type, they have a magnet inside to reduce operating current.

They wont operate with reversed voltage.

Your first link was about amplified audio, and the second was more like what I am talking about with attenuation of RF. When a strong station comes on, they sound distortedly loud even when I turn the volume almost all the way down. My experiment with the resistor softened them enough to eliminate the distortion and sound like most other stations. And I like the audio gain as is from stock. I need it for QSO night.?

On that second link, do you have other ideas along these lines? Or is that my best bet?

?

Not quite sure what you're trying to do, but here's some links on implementing an RF gain control.
? /g/BITX20/topic/4238539
???

?

I previously made the FLDGI CW keying circuit, and it works great. But better than that is using the rig controls for serial port PTT. Tests with the relay module and the Usb to serial adapter Indicates it's working very well. Next is the audio. I plan to use the Easy Digi schematic design for the audio connections with 600ohm audio transformers, and a 2kR across the lines and a 104C on the + line, of the radio side. The only hard part seems to be wiring all those stereo audio mini jacks. 3 on both the interface box, and the radio enclosure. Audio in, out, and PTT, and hard wire the audio adapter. Plus Allard's new wires from the Nano.

Has anyone thought about RF signal attenuation? I tried a 240ohm resistor inline with the antenna to better handle the bigger stations near by. It gave me the results I was looking for, but again it seems too easy for a proper solution. If there is nothing wrong with that, I might use a switch to bring it in and out of circuit.

I just happened to think that the attenuation would be both ways. Humm.

?

The relays are polarized type, they have a magnet inside to reduce operating current.
They wont operate with reversed voltage.

?

The NPN's powered from the "TX" 12v rail do not get power unless the PTT switch is pressed to transmit.
I suggest you concentrate on the receiver first.