Tornister Feldfu.b /c/ f has 3 tubes, super-regenerative receiver. The frequence adjustment is a multichannel switch with a fine adjustment through a hole on the right upper side.The control head has a volume and freqadjustment.The adjustment of frequence is made of a master-piece of a electrical instrument coil,and axial- controlled butterfly condensator.The transmit distance is given around 1-2km but I have in light terrain ca 3 km.The radio has no squelch.The transmitter power is ca 120-150mw.Receiver sensitivity is ca 2uv-8db noise reduction.Model Feld.Fu.b-1 has 2 tubes, and no RF unit,but all over the same constructions.Feld.Fu.b and c models was produced by Lorenz (Berlin),Horny.A.G and Saba,most part of the factories stay in DDR after the war.The Russian army take over and begin productions of some military radio-equipment,as R-105D series.They copy the German Wehrmacht radios with some modefications to the better,almost change the regenerative receivers with superhetrodyne types.Later in 1947/50 some other "copies" from German radios seen the daylights.Well working radios and mecanical structure make this equipment to work after 50 years "of-air."
Tubes: 1-RV2.4P700 , 1-RL2.4P2 and RL2.4T1
Closer picture of the "Moving coil" Types of my garnityr working with Feld.Fu series.
Here you see the ceramic moving coil controlling the butterfly adjusment condensator. A masterpiece. Hier sehen Sie die keramische bewegliche Spule, den Schmetterlings kondensator zu steuern. Ein Meisterwerk.
Feld.Fu.b are delivered with 2 types of antennas.The first model (1938-1941) have a antenna 110cm long whip in 2 pieces.Later from 1943 it is changed with a" band-antenna" 72.5cm long.
Vibrator Power Supplies
Back in the days before the transistor was invented, vibrators and a step-up transformer were used to increase the voltage from batteries. The vibrator is basically a high frequency switch that oscillated the battery's power into the primary of the transformer and generated "pseudo AC."
There is a another type of vibrator power supply that eliminates the rectifier tube, which uses a synchronous vibrator. Below is a diagram of a synchronous vibrator power supply. (Zerhacker W.gl.2,4a)
The last one is the most used in Wehrmacht equipments from 1942 -1945
98% of the German vibrators W.GL2.4a would not work after 60 years in the orginal pack.The syncron contacts is almost free of dust,but the start contact need adjustment.The setting screw must be turned one degree with the clock.Opning the vibrator is some "tricky",so be care.
Vibrator (Zerhacker) tools
Normally, any Vibrators from Wehrmacht WGL 2.4a new,would not start after staying in the orginal package after 60 years.The problem is that it is not packed in clean air.The start contact have a thin film on it,they other to,but this let no current go through to induct the coil.Therefore it it necessary to open it up,and clean the contact(s),or adjust the spring setting screw.Open up the unit is some tricky without disturbing the alluminium alloy.Place it together is more awefully.This tools make it all handy.First the vibrator is placed into the pressform, and the screw is tighten well.then the all-alloy is bend backward with a knife,and the vibrator is taken out for adjustment.Then back in the can, the Profil tools bend back the allu-alloy.The alluminium edge is profiled back like new.This tools took me a lot of time to figure out.The press-tools weight about 2 kg and steady to work with. I opened the vibrator and adjusted it,working well,like new. A problem with this vibrators are the mechanical noise. The damper (some sort of rubber) seems to have been chrimped after all this years.So,after the adjustment(s) the profil-tools clamp the pin-bracket down ca 1mm when it profiles the alluminium-edge.This is enough to press the rubber to the bottom and the side of the can. It is VERY important, when vibrator is reasembled,that the can edge-profile tighten all around the pin-bracket very hard,so no vibrations could go on. This is not possible without this 2 press-tools.This tools work well (40mm ø) with all the russian types of vibrators. They are copies of the German WWII types.Only the contacs and pins differ. ABOUT VIBRATOR and VOLTAGE.
Radiowerk Horny A.G.
Founded in 1936 in Wien when the Austrian arm of Philips took over the bankrupt Vindobona company. This turned out to be a smart move on Philips part as they were the main creditor and supplier of the original company and would thus have lost out if the company had not survived, further more the Hornyphon brand had become well known in Germany and Britain in addition to being by far the biggest supplier of radios etc. in Austria and became profitable soon after production was restarted. From it's founding throughout WWII ,producing military radios, and until 1947 the company was mostly occupied with the manufacture of it's own products but after that period Philips increasingly began to integrate the sales and branding of the various companies they owned world-wide and Philips products began to appear in Austria branded Hornyphon and products from RH were increasingly sold outside of it's home country branded as Philips, by the 60's the Hornyphon name had all but disappeared except as a local brand. The factories continued however and were for a time the main source of certain tape recorders lines from Philips, their excellent but seldom seen professional tape recorders were for instance designed and manufactured at the RH factory and later some video recorder lines were produced there as well. The usage of the Hornyphon trademark appears to have been dropped in the 1980's and I have not been able to find out for certain if the factory is still going but I believe it was one of the factories that disappeared in the "Rationalisation Programme" of Philips in the early 1990's, when the company sold and shut down a large number of product lines, technologies and factories in an effort to simplify it's management and financial structure (remember "downsizing" was
Radiowerk Saba A.G (Schwarzwälder Apparate-Bau-Anstalt)
1933: Schwarzwälder-Apparate-Bau-Anstalt August Schwer Söhne GmbH; Kurzform: SABA Radio Werke.Saba have produced sivil radios since 1933,and the products on market was on this time higher than Telefunken and the quality very high. So when the WWII start,Wehrmacht take over the production and begin making radio-parts to the war industry.1942 Saba starting making complet radio units,like Feld.Fu.b1 /b and c "tornister gerate",but still making parts to other radio factories.Saba A.G make radio-type Tornister Torn Fu.g series for a while to.Meny of this factories was spreed around,mostely in east (DDR) and therefore the russian army after the WWII keep this factories, and making their own equipment, Warsawa packt .
Staru A.G (Telefunken)
It is little writing about Staru A.G. As known,this factory starting making radio equipments for Wehrmacht in 1938.It seems that this factory constructed the first radioequipments, like Feld Fu.h .As I have found,Staru is the constructor of this unit first time,and some later Feld Fu.b and c.Later this was produced on many other radio factories from 1942-43.Staru AG ,a part of Telefunken,making radio remote controls earlier testing rockets with wire controls.
Radiowerk Lorenz A.G ( Lorenz A G., C., Telephone -Telegraphenwerke, Berlin - Tempelhof)
About Lorenz,it was one of the bigger factories before the WWII in Germany. As other radio /signal supliers,they was soon incorporated in war productions.As I have found out,earlier,1939-42 they was involved in making Tornister Feld.Fu. series for Wehrmacht.Later they productions of this unit was taken over by Saba and Horny Radiowerke.Lorenz consentrated the productions of greater transmitters 50-1000w for stationery operations,together with Telefunken/Philips.This time they make telephone/line,and connecting equipment to radios.
|Feldfu.a1||120-156 MHZ Infantry, Einsatz heer|
|Feldfu b||90-110MHZ Infantry|
|b2||Panzer grenadier only 2 tubes,no AF tube Rv2,4P700|
|Feldfu c||130 - 160 MHZ Infantry, Einsatz heer|
|Feldfu .f||28. 0 - 33.0 MHz Panzergrenadier|
|Feldfu .h||23.1 - 28.0 MHz Sturmgeschutz-einheiten|
|Kl.Fuspr.d||32.0 -38.0 MHz Artillery Beobacher (Arty F.O.)|
Feld.Fu.a1 0.150w 120-156MHz
RV2P800 SD1A RL2P3 Ant base-color dark brown
steel-blade ca 66cm
Feld.Fu.b 0.150w 90-110MHz Ant base-color dark red steel-blade 72,5cm
Feld.Fu.b1 0.150w 90-110MHz Ant base-color dark red steel-blade 72,5cm
Feld.Fu.b2 0.120w 90-110MHz 2 tubes Ant base-color dark red steel-blade 72,5cm
Feld.Fu.c 0.150w 130-160MHz Ant base-color dark green steel-blade 66 cm
Feld.Fu.f 0.150w 28.0-33.0MHz Ant base-color white steel-blade 1,20m
Feld.Fu.h 0.150w 23.1-28.0MHz Ant base-color dark blue steel-blade 1.50 m
Stassfurter A.G (Stassfurter Licht-und kraftwerke AG.Stassfurt)
Telefunken AG. Hersteller Funkgeraten
Documents,drawings etc. Dokumente, Zeichnungen usw..
"Wehrmacht Verband Packung",orginal sealed.
This soldier "verband packung" 2 pieces,stay normal into the Feld Fu box,inside, under the battery compartment,where the mic, hear-phone and antenna,was hidden.It seems to be a part of the radio unit,together with 1 light unit. (Not verified)
Dieser Soldat "verbandpackung" 2 Stücke, bleiben in den Kasten Feld Fu, Innere, unter dem Batterieraum normal, in dem das mic, das Hörentelefon und Antenne sind.It scheint, ein Teil der Radiomaßeinheit, zusammen mit 1 heller Maßeinheit zu sein waren.
Feld Fu.b 1941,the first antenna for this radiounits.
The Rod antenna in two parts.
Feld Fu.b 1/4 wave antenna model 1943 flexible-blade antenna.
.The antenna to b and b1 freq is 90-110Mhz 1/4 wave, and 130-160Mhz to c models.The antenna for b models is red and c model green on the connector head.The lenght of the antenna for feldfu.b is ca 72,5cm.and for c model ca 66cm.The distances you get from the radio is depending on correct antenna lenght.(It is critical), as the power is very low.Antennas in 1940 to 1942 is very long,maybe a 5/8 wave antenna.Later in 1943 the 1/4wave antenna was mounted.It seems the radio operate mutch better with this type of antennas.The connector is made of pur solid brass.The colour shade could have some differences on the photos.It appear some colours on the upper part of the connector,some grey,blue and red.
Feldfu base apear with colors:Green for "c",red for "b" and White for "f"
The antenna for feldfu.c is similar but cut to 66cm long, and connector is dark green as orginal.
Color for Feldfu front paint.
The original paint color are a brown/red mixed paint.Mutch like "Chocolate" RAL 8017 matt.It is original like the German Feldfu paint.
The Moving coil (Freq adjustment)
This moving coil was broken,no receiver adjustments was possible.As picture 3 from left show,A and B was broken.This is a through connector,between the motor house connector,and the rotor. Through point A and B ,a brass joining,it was broken right under the pertinax isolator.It seems this was done on the factory.After a time it will not working. Productions year 1944,when great sabotages was done by the workers.(prisoners).Well,now,it work again.
The frequence adjustment switch.Feld Fu.b and c
This is a complex adjusments.Picture 1 left,show thw adjustments.First set the switch to "Red" mark.Here the freq should be adjustet for 104 Mhz on the receiver.(Hole on right through the switch front.). Then transmit and adjust the transmitter condenser,through hole upper left inside the front,to 104 Mhz. Thats it.If the switch not corresponding with the front marks,picture 2,loosen the senter screw,locking the excenter bear roller house.All 10 rollers is factory made as a unit,and could make a excentric moving.This will get you a lot of work,DO NOT TOUCH! It is possible to do the test with a x-tall oscillator on 26 Mhz.It giving 4 harmonics on 104Mhz on receive.
New this year 2 Feld Fu´s 1 Feld Fu.b and 1 Feld Fu.b1.
I get 2 feldfu´s units this year.I get them from persons in Leipzig.They was in bad conditions. All the paint was more, and less loosen from front,and they do not work at all.The "b" set was the moving coil broken (adjusting the RX freq) and vibrator do not work. The condensators was leaky ,and small corrosion around inside the unit.The "b1" same as "b" unit,but with small chassis changes.B1 unit was produced in 1944,the most sabotages was going on around the radio factories and other places making war equipments.After deassembling the moving coil,I could see,this break down was made,for later giving a faulty operations.On the 1944 unit,also the transformers have break,as modulations transformer,the mod side ,secundary,was off inside.The same with transformer for mod tube inputside. To get this transformers to work again,giving me a lot of work. All at all,I demounted the units.Finishing the renovations,the unit functions as from factory.The only thing,I have no box to them,so I am going to the project to produce boxes.
Rest-belt and box connectors left and right down and upper. Feld Fu.
Feld Fu Replica box together with the original. (more pictures)
The collection of The Feldfu series field radios.
All radioes working with completed mic,hearphone,ant and controll cable to controllbox (60cm long). Testing the units in the field.The Feldfu b. operating over 1.8km to another feldfu b. Very nice. See :Tornfu.g
Frontcover and Channel fronts Feldfu b, c, f and h. Feldfu f continius adjustments.
Feldfu box 70 years in the mud and soil.
The Feldfu box was found by Eberhard Knips. He ground restorated the box, moving away all the corroded metall details inside/outside.Build up the box again with a "liquid two component Bakelite" A very,very nice job was doing by him. Later I make all the inside components and other parts.Finished with WH grey paint.The Feldfu radio unit was "ripped" from the most wires. The channel switch was ripped for all Freq lock parts as steel balls and springs.This lock mechanism was rebuilt with pertinax "milled" in one parts.
Tubes and regulators to Feld Fu and Torn Fu.g
RV2,4P700/RL2,4P2/RL2,4T1 and "Eisenwasserwiederstand"
This site was last updated 11/09/15 Home