The 31-year-old will act as cover for Jamie Stephens and Lennie Pidgley, who has just returned to training.
Bittner was released by Hereford in May, having made 37 first-team appearances last season.
The experienced keeper has also represented Forest Green, Salisbury, Woking and Exeter.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| C | Leyton Orient | 46 | 26 | 13 | 7 | 61 | 34 | 27 | 91 |
| P | Stevenage | 46 | 24 | 13 | 9 | 61 | 39 | 22 | 85 |
| P | Northampton TownNorthampton | 46 | 23 | 14 | 9 | 62 | 42 | 20 | 83 |
| 4 | Stockport CountyStockport | 46 | 22 | 13 | 11 | 65 | 37 | 28 | 79 |
| 5 | Carlisle UnitedCarlisle | 46 | 20 | 16 | 10 | 66 | 43 | 23 | 76 |
| 6 | Bradford CityBradford | 46 | 20 | 16 | 10 | 61 | 43 | 18 | 76 |
| 7 | Salford City | 46 | 22 | 9 | 15 | 72 | 54 | 18 | 75 |
| 8 | Mansfield TownMansfield | 46 | 21 | 12 | 13 | 72 | 55 | 17 | 75 |
| 9 | BarrowBarrow | 46 | 18 | 8 | 20 | 47 | 53 | -6 | 62 |
| 10 | Swindon TownSwindon | 46 | 16 | 13 | 17 | 61 | 55 | 6 | 61 |
| 11 | Grimsby Town | 46 | 16 | 13 | 17 | 49 | 56 | -7 | 61 |
| 12 | Tranmere RoversTranmere | 46 | 15 | 13 | 18 | 45 | 48 | -3 | 58 |
| 13 | Crewe AlexandraCrewe | 46 | 14 | 16 | 16 | 48 | 60 | -12 | 58 |
| 14 | Sutton UnitedSutton | 46 | 15 | 13 | 18 | 46 | 58 | -12 | 58 |
| 15 | Newport CountyNewport | 46 | 14 | 15 | 17 | 53 | 56 | -3 | 57 |
| 16 | Walsall | 46 | 12 | 19 | 15 | 46 | 49 | -3 | 55 |
| 17 | Gillingham | 46 | 14 | 13 | 19 | 36 | 49 | -13 | 55 |
| 18 | Doncaster RoversDoncaster | 46 | 16 | 7 | 23 | 46 | 65 | -19 | 55 |
| 19 | Harrogate TownHarrogate | 46 | 12 | 16 | 18 | 59 | 68 | -9 | 52 |
| 20 | Colchester UnitedColchester | 46 | 12 | 13 | 21 | 44 | 51 | -7 | 49 |
| 21 | AFC Wimbledon | 46 | 11 | 15 | 20 | 48 | 60 | -12 | 48 |
| 22 | Crawley TownCrawley | 46 | 11 | 13 | 22 | 48 | 71 | -23 | 46 |
| R | Hartlepool UnitedHartlepool | 46 | 9 | 16 | 21 | 52 | 78 | -26 | 43 |
| R | Rochdale | 46 | 9 | 11 | 26 | 46 | 70 | -24 | 38 |
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