G4DDK2001 Source board

 
Other frequencies in the range available to order.
£37 + Postage and Packaging
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Kit Contents as listed in table 1 below.  Some parts may not be by the manufacturers listed.
*Does not include the
crystal

comp side



2001top
This picture shows an 'F' filter  (F1) fitted. The 'A' filters (F2) fit nearer to the SMA connector
14 March 2009 update


Issue 'B'  PCBs are still available at 6UKP each

B  boards
Facility to fit either A or F pin-out Toko filters. With A pin-out filters the lowest frequency can now be below 700MHz.

The crystal oscillator input/output is now tracked to a pad for the SMA connector.

Important
The 'B' issue board has a small, unintentional, error. There is a track break between the pads for R2 and R6. This is difficult to see by eye. You must bridge solder this break.


 Box fitting.
 Scribe a line16.5mm below the rim of the box. This is the groundplane side edge. There should then be approximately 11.3mm of space between the component side of the PCB and the other rim of the box. Check the photos at the top of this page to see which corners of the PCB to file to allow the PCB to fit the box.



schematic5
  Schematic of the DDK2001

 

Designation

Value

Package

Suggested supplier

Manufacturer

Details

R1, R9,

10R

0805

Farnell

R2, R6

560R

0805

Farnell

R3, R4

1k

0805

Farnell

R5

820R

0805

Farnell

R7, R8

10k

0805

Farnell

R10, R14

100R

0805

Farnell

R11

390R

0805

Farnell

R12,R15

2.7k

0805

Farnell

R13, R16

27k

0805

Farnell

R17

47R

0805

Farnell

R18

39R

0805

Farnell


C1,C2,C3,C4,C7,  C31, C32

1nF

0805

Farnell


C5,C10

4 – 25pF

TZB

Farnell

Murata

TZB4Z250AB10R00
(Black)

C6

8.2pF

0805

Farnell


C8

27pF

0805

Farnell


C9

10pF

0805

Farnell


C11

22pF

0805

Farnell


C12, C18

470pF

0805

Farnell


C13, C14

3- 10pF

TZB

Farnell

Murata

TZB4Z100AB10R00 (white)

C15, C19

0.5pF

0603/0805

Farnell


C16

2.7pF

0805

Farnell


C17, C23

1pF

0805

Farnell


C24

2.2pF

0805

Farnell

C20, C25, C27

100pF

0805

Farnell


C26, C30

100nF

0805

Farnell


C21, C22

10uF/ 16V

Case B

Farnell


C28, C29

2 – 6pF

TZB

Farnell

Murata

TZB4Z060AB10R00
(blue)

L1

100nH

0805

Farnell


L2

390nH

0805

Farnell


L3, L4

33nH

0805

Farnell


L5, L6

18nH

0805

Farnell


L7

10nH

0805

Farnell


F1

5HW

 

BEC Distribution. –

Eisch Electronic

Toko

5HW 115045A-1195 (for 1152MHz)

Tr1

BSV52

SOT23

Farnell

Tr2

BFS17

SOT23

Farnell

Tr3, Tr4

BFR92AW

SOT23

Farnell

IC1

78M08

D-Pak



X1

HC18/U

 

Box

37 x 74 x 30mm

 

G3NYK

Schubert GmbH

Connectors

SMA

 

Farnell


Input feedthrough capacitor

1000pF

solder in
2mm with solder (earth) tag

Farnell

Tusonix


Table 1 – Component details for the 2001 source (for 1152MHz only)

Feed back from numerous builders of the DDK2001confirmes that the design is easy to build, easy to align and meets the claimed spec.

I have been informed of one version, fitted with an output filter for about 390MHz, that is now the lowest frequency unit in use!

I have decided not to have any boards made to 'C' issue just yet as I still have a large stock of the 'B' issue boards available.

No one has reported needing to use the 390nH inductor, L2, across the crystal in order to pull it onto frequency.

One useful tip:
The addition of a 10nH inductor across the input of the TOKO helical filter helps to achieve a better match and greater output at 1088MHz.







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This page last updated 14/03/2009