Taurus Flyer

crigotti,

Let me advice you,

The trimmers,

The adjustable range of the Arco 424 trimmer is 25 pF - 150 pF
The adjustable range of the Arco 426 trimmer is 55 pF - 250 pF

Because you want to built the 27 Mc version you need the trimmer with highest value, so the 55 pF - 250 pF. but available until now is the 25 pF - 150 pF.
150 pF already is a high value for this kind of pi filters so when adjusting the transmitter maybe it will do. When you reach the highest value, and output power still is increasing you can switch a parallel capacitor over the trimmer with a value for example 50 pF.

I use thimmers of 30 pF and do the same. A profit is the adjustment is more rigid,

You'll understand the other way can give you problems, higher frequency and a higher value of capacitor. It's nearly impossible to lower the capacitor value only by serial connection.

Transistors often did have a color dot to indicatie the gain.
We also see the extention A / B / C etc.
For your transmitter there are several equivalent transistors available if the 2N2926 isn't there. It would be more difficult when germanium were used but I thougth these all were silicon transisitors, so "modern" isn't it? We have to check these first, ge or si!

The coil can be swapped with another one, we will look for data.
Important facts are windings and diameter and for the core as you wrote, material.

Cees

crigotti

My Feedback: (3)

OK I can't upload the a pdf of my parts list so I converted it to a txt file and here it is. I'll upload a pdf of my Excel file when RCU gets their website fixed.


Sim-Plus Tx Parts List
Quan Description Designator Notes
1
22k 1/2w 5%
Red, Red,Orange R1
1
100 Ohms 1/2w 5%
Brown, Black, Brown R2
3
2.2k 1/2w 5%
Red, Red, Red R3, R4, R12
1
1k 1/2w 5%
Brown, Black, Red R5
2
470K 1/2w 5%
Yellow, Violet, Yellow R6, R16
1
10k 1/2w 5%
Brown, Black, Orange R7
3 10K Trimmer Pot R8, R13, R24 Solder side of PC Board
1
47k 1/2w 5%
Yellow, Violet, Orange R9
2
10 Ohms 1/2w 5%
Brown, Black, Black R10, R18
2
470 Ohms 1/2w 5%
Yellow, Violet, Brown R11, R17
1 5K Width Pot - Rudder R14 Part of Joystick with mechanical trims
1
6.8K 1/2w 5%
Blue, Grey, Red R15
Not Used R19, R20
1 100K Rate Pot - Elevator R21 Part of Joystick with mechanical trims
1
4.7 Ohms 1/2w 5%
Yellow, Violet, Gold R22
1 3K Pot - Rate Trim R23 Mounted on top of Tx
2 2N3646 Q1, Q2 MPS3646 - Substitute
2 2N3638 Q3, Q6
2 2N2926 Q4, Q7
2 2N2646 Q5, Q8 2N2160 - Substitute
2 Heat Sinks for 2N3646 Q1, Q2
5 .1uf Ceramic Disc (104) C1, C6, C7, C10, C13
1 75pf Siver Mica C2
3 .01uf Ceramic Disc (103) C3, C11, C12
1 Arco 426 37-250pf C4 GMC-30600 56 - 250pf
1 Arco 424 16-150pf C5 GMC-30400 25 - 150pf
1 .082uf Mallory 1603 C8
ECW-HA3C822H Panasonic
.082uf=450-900CPS, .047uf=800-1600CPS
1 8uf 10% 25Volt Electrolytic C9 8uf = 7.5 - 20 PPS, 6uf = 10-27 PPS 4uf = 15-40 PPS
3 1N4009 D1, D2, D3 1N4148 - Substitute
2 20uhy RF Choke RFC1, RFC2 70F225AI-RC
1 CTC 2173-3-3 L1, L2 Coil Form
8" 26awg Magnet Wire L1 8 1/4 T of #26awg tapped at 4 1/8 T from bottom +9V
4" 26awg Magnet Wire L2 2 1/4 T of #26awg over center of L1
16" 22awg Magnet Wire L3 9 T of #22awg 1/2 " ID
1 27.045 Mhz XTAL 3rd Overtone of 9.015Mhz fro 27.045Mhz
1 DPST Slide Switch S1 Power Switch - Slide
2 SPST Slide Switch S2
Pulser On/Off
Fast Pulse Engine Control
2 NC Push Button S3, S5
Engine Low
Fast Pluse Engine Control - 913XA (Black)
1 NO Push Button S4 Engine High - 903XA (Red)
1 9.6 Volt Battery B1 2 HK 4.8 Volt 2300mh LSD packs 2.4 x 2.1 x 1.2
1 9 Volt Battery Connector B1 3 Pin "Y"connector
5 3/16 x 1/8 x 1 1/4 Spacer Metal PC board Spacer
1 Center Loaded Antenna Antenna - Tuned 1/2 wave for 27Mhz 54" with Center Loading Coil
1 Chassis 7 7/16 x 5 x 2 3/16 7 x 5 x 3 Tite-Fit 546-141QU (Cut down to 2 3/16)
1 #4 Grommet Antenna Grommet 3/8 ID x 1/2 OD
2 1/4 Plugs Chassis Plugs for Trimmer Cap Tuning
1 1/2 x 9/16 x .050 Brass Angle Antenna Bracket
6 4-40 x 1/4 screws, wahsers, nuts Antenna Mount, Battery Tray, Switch
1 6-32 x 1/2 screw, washer, nut Antenna Screw
5 4-40 x 1 1/2 screws, washers, nuts PC Board Mounting
1 PC Board 7 x 2 x 1/16 single sided
1 Knob R23
4 Rubber Feet

crigotti

My Feedback: (3)

I just noticed that on the e-radiocontrol site:

http://www.e-radiocontrol.com.ar/?Historia_del_R%2FC

There is a file for the ACE Sim-Pulse.pdf that describes some modifications to the Sim-Plus transmitter. The problem is that the pdf is poor quality and just good enough to see that I want to incorporate the mods. Does anybody have a beeter copy of this ACE manual that shows these mods?

TThe ACE Sim-Pulse.pdf file is just below the ACE Sim-Plus.pdf file which is a decent pdf.

Thanks.

crigotti

My Feedback: (3)

It looks like RCU has fixed the upload file viewing problem. My parts list and layout are now visible.

Taurus Flyer

Crigotti

After reading that document of post 28 I understand the modificaions.
To realize these I have to spend some time to evaluate because also in that document I discover a fault and so maybe there are more.
The description contents two modifications, the second is swap the CLC antenna for a BLC (Base Loaded Coil) antenna and the first modification is insert components to reduce the effect of RF radiation in the timing circuit. The first modification CAN be needed because there is mounted the coil of the BLC in the casing(second mod)!!

For sure is the CLC will give a wider range, so I doubt it is worth the effort. Maybe only for indoor use for example!

Cees