Serit FTS4335V NIM and converter kit for MiniTiouner.

[G4EWJ]

The NIMs and kits should be available from the BATC shop very shortly. For information and instructions, go here: http://wiki.batc.tv/serit_tuner

Please use this thread for feedback.

Any significant changes will be noted is this message as well as further down the thread.

As of 7 March 2017, the latest version of the instructions is 1-07, parts list Build A1 v1, Schematic A1 v2 and Silkscreen.

Brian

[G4EWJ]

The parts list Build A1 v1 is now on the Wiki zipped up with Instructions v1-04.

http://wiki.batc.tv/serit_tuner

Brian

[G4EWJ]

The instructions have been updated to v1-06 to clarify the naming of the antenna sockets. http://wiki.batc.tv/serit_tuner

Apologies for the streaky printing on some of the kit insert sheets. I think it's time to retire my 22 year old laser printer.

Brian

[g0mjw]

Hi Brian,

Arrived, built, tested OK. Very easy. Mechanically better than I expected.

Do we know if we can get hold of the lie flat PCB mounting tuners? Seems a new PCB designed for a Hammond 1455 case might be doable for those without an existing minitioune to modify.

Mike

[DG8KD]

Hi,

Some questions:

What would happen if the 1,1 volts is active (instead of 1 v) while using a Sharp tuner?

Will it fail? What will fail? Any risk of damaging something?


--------------
Taken from the PDF supplied to the kit:
Resistor
R99 390k 1% orange, white, black, orange, brown
This is fitted to the MCP1826-ADJ 1v regulator (U2) circuit on the MTK1 MiniTiouner PCB.
Leave R5 in place and solder the 390k resistor in parallel with it. Keep the resistor legs for later.
Without any NIM connected, connect a supply to the MiniTiouner and check that 1.1v nominal can be measured at test point TP1v on the MiniTiouner PCB. The allowable range is 1.07v to 1.13v.
Disconnect the supply from the MiniTiouner.
Remember to remove this resistor if the MiniTiouner is ever used with the Sharp or
Eardatek NIMs.

Why not using a simple switch to switch this resistor parallel to the existing one when we are using a Sharp or Samsung tuner?
Are they any problems to expect?

73
Rainer

[M0YDH]

No sooner had I noticed that the Serit Nim tuner and parts were in the shop then they'd sold out!
Our radio club has asked me to kit a Portsdown receiver. May I have an idea when these popular parts will be back in stock?

73

David M0YDH

[G4EWJ]

Mike,

I believe the H version is available from the same source. The reason for sticking with the V version was purely for my ability to etch a homebrew test board. If the two rows of pins were on the same side of the board, I would either have run to tracks through the pads for the other row, or take them all round the side to the back. My tolerances aren't good enough for the former.

As mentioned in the instructions, it may be possible to use right-angled connectors on both sides of the converter board and fold the NIM back over the top of the USB module, if an existing box is tall enough.

Brian

[G4EWJ]

Rainer,

A switch should work fine. I would use a small pcb type which needs a screwdriver to change it, so that it is not easy to knock it accidentally.

For the FTS4335, the datasheet gives the allowable range of the 1.1v supply as 1.00-1.21v. I don't have the Sharp datasheet to hand at the moment, but if it has the same +/-10% range, then 1.1v may be OK. It may be possible to set the voltage to 1.05v and not have to change it when changing NIMs.

Brian

[DG8KD]

Hi Brian,

Thanks for the reply.
I´ve checked the data sheet of the Sharp BS2F7HZ0169 NIM tuner.
1-10 Operating voltage is specified VDD = 1.0 V ( +/- 0.05V) DC

So your proposal to use a voltage of 1.05 V is a good starting point.
Any proposal which resistor value to use? (my digikey order is still open....)

Thanks
Rainer

[G4EWJ]

With the Sharp only going to 1.05v, I wouldn't recommend a single resistor for the two NIMs. I would go for the switch.

Brian