Where to find HELP for some particular components
 (relays, pin diodes, transistor, capacitors)

 

Down load this page (parts_suppliers_notes.zip) as a .zip file (.pdf format) <----click here
(as an example and of course from all others component distributors not here indicated because not known by us).

Relays

You can try many small relays from different manufacturers that fit in our board space. We have used nowadays available industry standard types (single SPDT dimensions are: long 15.5 mm (.61), large 12 mm. (0.472), high 13.9 mm. (.547) like Nais/Aromat/Omron or other firms and most of them are single SPDT unit otherwise indicated in the schematics.

Particular ones:

In unit 1 – Low-Pass/High Pass unit the input relay is a Nais/Aromat TX2-12V (a smaller dimension with good isolation per price) pdf file at http://naisrelay.com/  choose PDF catalog, mechanical relays.

The same type has been used also in unit 4 - Pin-diodes variable attenuator, also in

unit 8 – the RX out relay only is a SPDT by Nais TX2-12V (<---click here for link to .pdf Nais data sheet, same as above
choose TX Relays  family).

It is available from Allied Electronics at http://www.alliedelec.com:

Mfr.'s Part #: TX2-12V
Allied Stock #: 788-1030
Manufacturer: AROMAT
Description: High Capacity Relay, Through Hole, Single Side Stable, 12V
Current Page #: 643*
Previous Page #: 109*

In unit 9 –the PTT activated power supply 13.5Vdc ampls relay switch is an abundant solid one and fast by OMRON G5LE, a 12Vdc SPDT (1 pole 10A) (data sheet in http://www.omron.com, under relay PCB power general types) for longer life.

It also available in ALLIED Catalog :

Mfr.'s Part #: G5LE-14-DC12
Allied Stock #: 821-1038
Manufacturer: OMRON ELECTRONICS INC.
Description: Relay, PCB, Subminiature, SPDT, 10 Amps, 12 VDC, Sealed
Current Page #: 696*
Previous Page #: 141*

Co-axial RF Power relays (for higher than 150 watts to 250 watts antenna A/B tx/rx selection option) one suitable of many available could be:

Tohtsu®
Co-Axial Relays
in RF PARTS Co catalog under Relay, Co-axial: http://www.rfparts.com/

 The SPST RF reed relay (max up to 100-150 watts CW) by WABASH, 1017-18-1,

is in Surplus Sale of Nebraska catalog at http://www.surplussales.com/. It was used to switch the output low pass filters in Rockwell-Collins KWM380, and it is much lower priced than the original Wabash SPDT version).

For pre-amplifiers:

2N5109 RF wideband transistor is available in RF PARTS Co (California) catalog at

http://www.rfparts.com/2n.html. Motorola does not produce it anymore but other manufacturers do so you can find  2N5109 also in  MOUSER catalog (http://www.mouser.com), see now also Advanced Power Technology APT 
(Also Motorola has annouced replacement part with APT for 2N5109)

Capacitors trimmers:

Capacitor trimmers used in the passband filters, if not available the Philips Teflon/film type, you can also use ceramic cap. trimmers as those in Jameco catalog ( http://www.jameco.com, select components, capacitors, ceramic trimmers caps)

Pin diodes for variable attenuator

Pin –diodes AGILENT 5082-3081 (<------click here for DATA SHEET)
are, in example, in ALLIED catalog   http://www.alliedelec.com/

Mfr.'s Part #: 5082-3081
Allied Stock #: 787-1225
Manufacturer: AGILENT TECHNOLOGIES
Description: Diode, Pin, 100V, Surface Mount
Notes:
Current Page #: 789*
Previous Page #: 790*

and also in Newark catalog at http://www.newark.com/

See AGILENT (ex-HP) application note 1048 "A low-Cost Surface Mount Pin diode pi Attenuator"  with schematics for a 3 diodes 5082-3081 and a discussion about an even more symmetrical configuration with 4 diodes with test report over the frequency range of 300 KHz to 3GHz. At 10 Mhz it is reported a two-tone third order intermodulation distortion input intercept point around +30dBm for attenuation setting from 10 to 20 dB, and even much better for lower attenuation levels.

Updated: 09 aug 2003