None Electrolytic Splitting Of H2o

[Michael John Nunnerley]

You are fast!!
That could work for us if you hold the aerial near the amp. I think .And it's cheap.
Any idea on the VHF amp that work from a 1mW input?
I found the local supplier for Mini Circuits here in South Africa. They do ask double the price but that is ok as Mini Circuits do not ship here for cheap and this way I know I will get it.
I still want to try the components on a pc board.
The POS-200+ and the POS-1000W+. They are much cheaper and how difficult could it be to make a pc board for it.

Mounting on PC boards is a very difficult job, the design is not the same as for none RF electronics, Not advised


Mike

[nvisser]

Mini Circuits does give some guideline for pcb layout on plug in VCO models and I will also contact their technical advisers for help, But I think they will suggest the same as you did.

http://www.minicircuits.com/pages/pdfs/vco15-19.pdf

[Aaron]

parts list

Mike or anyone else,

Any of the below sourced parts not the right ones for the job?
Only the ones with an * in front are the ones I'm concerned about
if there are special considerations.

Need to find a more easily available replacement for: Toshiba S-AV10L amp

Now if someone could post a complete schematic tying them all together,
this took enough time for today. I saw the different amp circuits, etc...,
but if someone could put them all together in one solid schematic, that
would be helpful to everyone.

PARTS LIST
All prices in USD

MINICIRCUITS.com

1 ZX95_1200W+ VCO $49.95
1 ZX95-200-S+ VCO $37.95
2 SM-BF50 SMA-male to BNC female adaptors $3.95 ea, $7.90

$95.80 + s/h



EBAY.com

1 Motorola 85Y12 RF amp $7.99
*1 Power supply 12-15v dc 10amp fully smoothed $19.96
1 3" X 3" 12v cooling fan $4.99
*5 meters 50 ohm RF coax cable (50 ft RG-59) $7.99 (50 ft RG-59)
*1 Aluminium box 222mmX146mmX55mm or there abouts with lid (die cast is best) $17.49

$58.42 + s/h

MOUSER.com

4 LM317 voltage regulators $0.45 ea, $1.80
*4 22K multi turn resistors, two of which should be good quality (panel mounting) $2.32 ea, $9.28
*4 1.8K resistors $0.05 ea, $0.20
*4 100mh chokes, two for 5amp min and the others does not matter $1.08 ea, $4.32
*4 100mf electrolytic caps $0.07 ea, $0.28
4 100nf ceramic caps or other type $0.73 ea, $2.92
*8 BNC RF male connectors (for coax) $1.34 ea, $10.72
*6 BNC RF female panel mounting connectors $1.20 ea, $7.20
*1 6" X 4" DOUBLE sided blank PCB board cut in half 3" X 4" $4.65

$41.37 + s/h



???.com

1 Toshiba S-AV10L amp




GRAND TOTAL = $195.59 + S-AV10L + Shipping/Handling


Guesstimated Final Grand Total around $225~250 USD

[Duncan]

Nvisser check your PM

[Michael John Nunnerley]

alterative to S-AV10L

Here is an alterative to the S-AV10L

Hitachi PFO 310A

@10mw input it will give around 8.5watts on the output @ a frequency of 136mhz. The voltage divider resistance will have to be changed for the output drive, minor detail, the rest is the same

Mike

[nvisser]

Still questioning the 10mW input to 10W amp

The S-AV10L should be available, I have seen it in some places on the web.
10mw is plenty to drive these amps and others to 10-15w.
The frequency is linear with the control input voltage, you can use the table supplied by Mini Circuits on the data sheat and put a volt meter on the control line, its that simple.

We are now talking 135mhz and 810mhz so the sizes I gave for the antennas have now changed, I will recalculate and give you them at a later date.

If I can find a site with the toshiba amp I will post it.

Mike

Looking at the datasheet it looks like the S-AV10L needs 200mW as input.
Will it even work with a 10mW input
With a 12.5V supply it gives only 2W with a 40mW input. I really cannot see that it will work without a pre-amp.
I cannot find a supplier for the Hitachi PFO 310A

[nvisser]

I ordered some 85y12's today from here.
Motorola SHW5151 UHF Amplifier Module 5W 700-900MHz,New - eBay (item 150207117776 end time Nov-02-10 08:58:03 PDT)
The shipping cost is low.
They also got some very cheap VCO,s in their store so I ordered 2 of them.
Z-COMM VCO 700MHz-1200MHz, V502BMS1, MINI-14H - eBay (item 160408020880 end time Oct-22-10 18:58:07 PDT)
and
Z-COMM VCO 104MHz-176MHz, V140MC01, MINI-14S - eBay (item 160408130880 end time Oct-23-10 06:16:04 PDT)
The VHF VCO only got a output of 4.5dBm though.
It's a start at least as there won't be much funds left after my Bedini conference trip!!
Any of you guys coming?

[Michael John Nunnerley]

Looking at the datasheet it looks like the S-AV10L needs 200mW as input.
Will it even work with a 10mW input
With a 12.5V supply it gives only 2W with a 40mW input. I really cannot see that it will work without a pre-amp.
I cannot find a supplier for the Hitachi PFO 310A

Yes the S-AV10L does need a pre amp using a BFR93, but is a very simple circuit which will give around 150mw into the amp.

I have not looked at suppliers for the PFO 310A, only looked at data sheats, as a possibility

Mike

[bugler]

Yes the S-AV10L does need a pre amp using a BFR93, but is a very simple circuit which will give around 150mw into the amp.

I have not looked at suppliers for the PFO 310A, only looked at data sheats, as a possibility

Mike

Michael, can you put all the information in a single document with a step by step instructions os it is easy to replicate?

Thanks.

[nvisser]

Bfr93

Thank you Mike
They are a few cent at my local electronic supplier.
Here is the datasheet and it even got a circuit on!!

http://www.mantech.co.za/Datasheets/Products/BFR93A-NXP.pdf

[Michael John Nunnerley]

don't use this circuit

Thank you Mike
They are a few cent at my local electronic supplier.
Here is the datasheet and it even got a circuit on!!
http://www.mantech.co.za/Datasheets/...BFR93A-NXP.pdf

I will do a circuit for it tomorrow for 50 ohms, very similar but values are different

Mike

[Michael John Nunnerley]

circuit

The preamp and power amp circuit, values to come

Mike

[Michael John Nunnerley]

circuit

Preamp

Q1 BFR93
C5 100nf
C6 1nf
C7 1nf
R3 100
R4 10K
L3 10mh choke

Power amp

C1 100mf elec
C2 100mf elec
C3 100nf
C4 100nf
R1 1.8k
R2 22k 10 turn
L1 100mh choke
L2 100mh choke
K2 LM317 voltage regulator

On the positive to ground there should be another 100mf elec and 100nf cap in parallel, it is missing off the diagram.

The system of mounting is on a double sided PCB with the ground on the underside, all components should have their leads as short as possible.

C7 to power amp line should be strip line 50ohms or a very short piece of 50 ohm coax with shield connected to the ground plane (other side of board)

Mike

[Duncan]

Michael, can you put all the information in a single document with a step by step instructions os it is easy to replicate?

Thanks.

VHF Magnetic Loop by dxzone.com and maybe this70cm Magnetic loop

[Michael John Nunnerley]

Circuit update with caps

Here is the updated circuit with the two caps C8 and C9 which both go to ground.

Mike