Tell you what Tony, those Denco coils were expensive...
A lot of my pocket money went towards buying a couple when I was a lad.
Loved the idea of them coming in screen cans and that folded up paper
with circuits on...
Them were the days :)
Philip G4JVF
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--- In QRPLabs@..., Tony Volpe <tony.volpe.1951@...> wrote:
Is that a 'Denco' filter?
:))
Do you remember the Denco plug in coils? long ago, I had a regenerative
receiver kit that handled band changes just like that. They were really
terrible things, they could jump several kilohertz if you moved your hand
to the tuning knob or off it after you'd tuned something in.
Bzb
On 29 June 2013 19:11, Philip <pcteee@...> wrote:
**
Done a mod today to make use of Hans pluggable LP filters...
Mounted the filter sockets on some PCB on the lid of the case.
These are coax wired internally and I can just swap out filters without
opening the box.
A small metal box then clips over the filter to screen and protect them..
Picture here...
Running a test on 10 meters WSPR today into a loft dipole..
Conditions are poor but I'm getting spotted and the U2 is nice and stable
Philip G4JVF
--- In QRPLabs@..., "Philip" <pcteee@> wrote:
Received my second kit this morning....thanks Hans
I had a box ready prepared for it.
This large box is designed so I can tinker with things like
filters power supplies and PA stages hence the roomy interior.
MK1 test bed is using a separate PA stage (no FETs on the kit board).
Driven from the DDR, this PA transistor gives me the output powers
shown scribbled in the circuit diagram.
I'm going to add a drive pot so I can set the output on all bands to
say 200mW or whatever.
This PA can drive a simple IRF510 to 3 or 4 watts if needed.
The kit board switches a relay which switches the 12 volt supply to the
PA when in transmit..
Using external switchable LP filter box...
Rear panel has a 5 pin DIN socket for the external GPS module....
Much fun tinkering to come :)
Photos in this link...
Philip G4JVF
