Welcome
to Sam's Microwave Page
G4DDK / W5DDK
Loc: JO02PA
New
VLNA2 Issue B2 document replaces the previous individual 23cm VLNA and 13cm VLNA documents. Issue B2 of the PDF contains circuit descriptions, construction and tuning information for both the 23 and 13cm VLNA. Many of the RW3BP modifications are now incorporated. The new VLNA2 kits are easier to tune for lowest noise figure and exhibit greater stability than the original design. The 9cm VLNA design and details will be updated later. The original version of the 9cm pre-amplifier (VLNA1) is still available until then. The 23 and 13cm kits now include the MGF4919G, but if you prefer, I can supply NE32584C or ATF36077 on request.
VLNA2 Issue B2 document replaces the previous individual 23cm VLNA and 13cm VLNA documents. Issue B2 of the PDF contains circuit descriptions, construction and tuning information for both the 23 and 13cm VLNA. Many of the RW3BP modifications are now incorporated. The new VLNA2 kits are easier to tune for lowest noise figure and exhibit greater stability than the original design. The 9cm VLNA design and details will be updated later. The original version of the 9cm pre-amplifier (VLNA1) is still available until then. The 23 and 13cm kits now include the MGF4919G, but if you prefer, I can supply NE32584C or ATF36077 on request.
Due to popular demand, I am making a limited number of Upgrade Kits available for earlier 23cm and 13cm VLNAs that used the NE32584C or ATF36077 so that you can upgrade your pre-amplifiers to the latest VLNA2 build standard. The kits include:
MGF4919G
3n3H SMD choke (replaces R3)
220R resistor (replaces R4)
small block of absorber material
length of 0.315mm enamelled copper wire.
Additionally, the 13cm VLNA2 upgrade includes a 5.6nH inductor to replace L9.
The upgrade kits cost 7.50GBP + postage and packaging
Reluctantly,
I
have
had
to
increase
the
VLNA2
kit
price
to
£49.50
to
cover
recent
increases
in component costs. All versions of the kit are the same
price plus
postage and packaging. I use Royal Mail First Class Small
Packet service. You may wish to request the 'International Signed-For'
service where postal deliveries have proven to be a problem.
For payment, I can accept Paypal, cheque (UK only), or Bank Transfer.
E-mail me for details. E-mail address at the foot of this page.
Link to pre-amplifier articles Includes a 'must read' by Sergie, RW3BP
For payment, I can accept Paypal, cheque (UK only), or Bank Transfer.
E-mail me for details. E-mail address at the foot of this page.
Link to pre-amplifier articles Includes a 'must read' by Sergie, RW3BP
G4DDK2001
PCBs and now FULL kits except the
crystal*
The 750
- 1350 MHz frequency
range L
signal source, as published in
the
September 2008 RSGB Radcom.
*The crystal required depends on the final frequency. There are too many variations for me to stock crystals
Many builders already have suitably aged crystals they may wish to use!
WA5VJB PCB antennas
Enquire for details
Log periodic yagis 900 - 2600 MHz
and
2 GHz to 11 GHz (Including
3400 MHz) Vivaldis 2 - 25
GHz
1296 MHz 'Big Wheel' antennas.
*The crystal required depends on the final frequency. There are too many variations for me to stock crystals
Many builders already have suitably aged crystals they may wish to use!
WA5VJB PCB antennas
Enquire for details
1296 MHz 'Big Wheel' antennas.
G4DDK2010 144 to 28MHz receive converter design from March 2010 Radcom article
Please note that there was an error in the component list. Some digits in the Coilcraft inductor
number got reversed. The correct part number is: 165-07A06L 92nH
Details here http://www.coilcraft.com/uni5.cfm
| Contents The UK Microwave Group RSGB Tech stuff WA5VJB Antennas About G4DDK Links G4DDK Blog Spot Change history:- 27/7/2010 Large amounts of old and out of date material has been deleted from the web page. New pages will be added as time permits. 11/8/2010 Blog updated to cover the Dallas EME Conference visit 18/8/2010 The VLNA PDF has been up-issued to B2 to include a small change to T3 absorber positioning |
| This
page
last
given
some
TLC |
| 18/08/2010 |
Page
first established
November 1997
|