iz HEWLETT PACKARD TWT Retrofit: High Power Common Carrier Features * High Reliability + Energy Efficient FCC Type Accepted * High Channel Loading Capacity Easy to Install * No Maintenance Required Office Battery Powered Cost Competitive 4, 6, 7, 8 and 11 GHz Bands Description Hewlett-Packard manufactures a complete line of solid state power amplifiers and retrofit accessory kits to replace TWTs and their associated power supplies in terrestrial point-to-point microwave radio transmitters. These full-band amplifiers are available with 10 watts output power at 4, 6, 7, 8 and 11 GHz. The 6 and 11 GHz units are available in two physical styles. Performance characteristics of both styles are identical. The single unit has the RF and DC/DC converter combined into a single package that is ideal for replacing the older style TWTs. The split unit separates the RF and DC/DC converter into two packages with the RF section having the same footprint as the high-efficiency TWT it replaces. Cost Effective TWT Replacement HPs solid state power amplifiers are a cost effective solution to TWT replacement. Solid state GaAs FET RF power ampli- fiers typically require less current than a TWT amplifier. This reduction in DC power consumption can increase the battery plant reserve time or allow additional equipment to be added without increasing battery capacity. Reduced power con- sumption can eliminate the need for increased rectifier re- charging capacity and larger emergency engine alternators. Less power dissipation means less heat is generated, thus the cost of air conditioning can be reduced. if obsolete power plants or air conditioning units are to replaced, the new ones can be smaller and less costly. The HP amplifier is directly competitive in initial price if any part of the TWT amplifier needs to be changed. Retrofit accessory packages include all hardware, transitions and instructions Power Amplifier (Single Unit) needed to complete an amplifier retrofit installation in about one hour. Retrofit amplifiers are also equipped with an input attenuator capable of accepting any RF input power level between1 and +10 dBm, thereby permitting installation of the TWT replacement amplifier without requiring adjustment to any of the previous stages. Additionally, these amplifiers can be used as spares for all of the various radio types that have been retrofitted. Solid state amplifiers can dramatically reduce maintenance costs. All TWT amplifiers have to be realigned periodically to correct for aging. Older tubes need adjustment three to four times per year. When these tubes are replaced with the HP solid state amplifier, no periodic alignment is required. Once the power amplifier output is set by adjusting the attenuator and the unit is placed into service, only the required FCC checks must be made. Since the HP IMFET internally- matched GaAs field effect transistors, at ambient room tem- perature, operate at a 115C channel temperature, the calcu- lated device MTBF exceeds 30 years. With this reliability, significant cost savings through !ong life can be realized. However, inthe unlikely event of failure of the IMFET device, the output stage is also designed to fail-soft, thus avoiding complete service outage. Transmission improvement Many transmission improvements can result when traveling wave tube amplifiers are replaced with HP solid state power amplifiers. As mentioned above, the output of a TWT amplifier degrades between adjustments. On the day of adjustment, 12-19TWT Retrofit: High Power Common Carrier it will put out its rated power and gradually drop until it needs to be readjusted or a low output alarm comes on at about 3 dB below rated power. Experience has shown that the average output of a tube-type amplifier is 2 dB below design value which corresponds to a 2 dB reduction in fade margin and 59% increase in outages. Since the output power of a solid state amplifier is not affected by the sag of cathode erosion as in a TWT, the transmitter is always putting out its rated power. This results in lower thermal noise in the receiver and a better fade margin, thus a quieter system with increased availability. System Loading Maximization Here is an example. The 6 GHz band can support 1800-2400 voice circuits in its 30 MHz channels. However, a number of users have found that routes designed and engineered to rigid noise budgets will not meet noise objectives when loaded beyond 600-1200 circuits. Testing short sections of facilities (6-10 hops) may show that each section is performing exactly as engineered. However, when four or five sections are tested in tandem, it may be found that the total picowatts of noise measured is two to three times the sum of the noise measured on each of the short sections. Here's why. Picowatts are a measure of power; adding sec- tions results in power addition, that is, 10 log addition. The same results can be obtained by combining the dBncO read- ings of the shorter sections on a power ratio (again 10 tog) basis. tt is very difficult to determine the amount of 20 log (voltage addition) noise in aper hop or short section test, since, in a short section, the 20 log noise may be completely masked by the sources of 10 log noise. On longer sections it can quickly become predominant. The most common cause of this type of noise is AM/PM conversion in the traveling wave tube amplifier and in the upconverter. TWT amplifiers normally have AM/PM conver- sion of 4 to 8 degrees per dB. HP solid state retrofit amplifiers typically perform at 1.5/dB across the 500 MHz band. Re- placement of the TWT with an HP solid state low AM/PM amplifier will significantly reduce intermodulation noise due to reduced AM/PM conversion in the transmitting amplifier. With 2 dB reduction in thermal noise by eliminating TWT output sag and with four to five dB improvement in intermodulation noise due to AM/PM reduction, it is possible to fully utilize the 1800 to 2400 channels of system design capability. Driver Amp Upconverter AM/PM Reliet Depending upon the system that you are retrofitting, you may also be able to remove the AM/PM problem in your upcon- verter. if your system normally drives the TWT at a level higher than 0 dBm, you could drop the level of IF signal into the driver amplifier section of the upconverter such as to give 0 dBm at the upconverter output. Then, by using the full gain of the HP solid state amplifier, you can maintain a +40 dBm output. Dropping the level into the driver amplifier 4-10 dB should significantly reduce the 20 log noise component. AWP Serles High Power TWT Replacement Amplifiers Guaranteed Specifications @ 25C Case Temperature AMPM = Output Conver Power Output Envelope Re Noise (dB) = Variation Power Delay Her- Spur- RetumLoss input Frequency input Output Figure @WMax. 0t2 455C FAlatness Distortion monics ious (4B) Power"? Range Power Gain Power"? (4B) = Output (dB) (dB) (neec) (dBc) = (dB) Min. pc Case Model (GHy (dBm) = (4B) _(watts/dBm) = Max. Typ./Max. = Max. PP PP Max. Mex. inputOutput watte Type AWP-42100 3.7-4.2 Note 1 Note2 10/+40 10 1.5/3 125 .25+ +16 3 -60 20 20 76 RJA AWP-64100 5.925-6.425 Note1 Note2 10/+40 10 15/2 +425 .255 +17 $3 -60 20 20 76 RJA AWP-64105 5.925-6.425 Note1 Note2 10/+40 10 15/2 +25 .255 +17 $3 -60 20 20 76 PHL AWP-64105F 5.925-6.425 Note 1 Note 14 10/+40 10 15/2 +425 2.55 +1? 53 -60 20 20 76 CJL AWP-71100 6.4-7.1 Note 1 Note2 10/+40 10 153 425 #25 41" 53 -60 20 20 76 RJA AWP-77100 7.1-7.7 Note1 Note2 10+40 10 15/3 125 #25 = +1" 53 60 20 20 76 RJA AWP-83100 7.78.3 Note1 Note2 10/+40 10 15/3 +25 #25 41" 53 -60 20 20 76 RUA AWP-117500 10.7-11.7 Note 1 NoteS 5/+37 10 1.5/3 +216 25 +1" 53 = -60 18 18 76 RJA Notes: 1. Accepts any input level from -1 to +10 dBm for rated output 7. Peak-to-peak across any 30 MHz band. power. 8. Gain adjustable from 27 to 38 dB for an output power of +37 2. Gain adjustable from 30 to 41 dB for an output power level of dBm. +40 dBm. 9. At-24 or -48 VDC. 3. At maximum gain. 4. Peak-to-peak across any 20 MHz band at +40 dBm output power. 5. Peak-to-peak across any 30 MHz band at +40 dBm output power. 6. Peak-to-peak across any 20 MHz band. 10. Peak-to-peak across any 40 MHz band at rated output power. 11. Peak-to-peak across any 40 MHz band. 12. At nominal input. 13. 1dB compressed. 14, +0.75 dB over +10C to +45C. 15. Maximum output power variation from 0 to +50C. ALL OTHER PARAMETERS THE SAME AS THE AWP 64105 EXCEPT CASE (FOR CASE REFER TO ATTACHED INSTALLATION DWG.) 12-20TWT Retrofit: High Power Common Carrier Retrofit Product Selection Guide SAS ASEAS AE /P AS. % go A Ky AAS Ls SS ger, a ee w& ay ay befor i ars3 MS109E xX MS109E1 x xX MS109ES MW109E MW10S9E1 MDR6 MW109A3 MW109B3 MW609E MW609E1/MW618) Lenkurt CTR108 775G Xx TT5A <>< |= (ERS TELETTRA HT 12/4 _xX HT 12/6L xX HT 12/6 HT 12/8 GTE er FM 1800 x 775C 775D Xx NEC sG7aMB Northern Telecom RA3T4 RA3T6 x RD3 Raytheon KTR3A/E KTR3TS RDS6200 KTR3A/E11 x RCA MM600 a Western Electric FR-6 TD-2 TD-3D 660 Ds ata TH-3 TMA1 TM2/2A xX < KX << EG 12-21TWT Retrofit: 3.7 to 11.7 GHz High Power Common Carrier Frequency Range TWT RETROFIT Installation Drawing h a 0000000000000000000000000000 D 1.325 0000000000000000000000000000 33.65 0000000000000000000000000000 } o 0000000000000000000000000000 5 0.600 15.24 10.680 271.27 6X #4-40 UNC-2B .250 [6.35] ! 0000000000000000000000000000 3.605 0000000000000000000000000000 3157 0000000000000000000000000000 qe O O 3 1585 2.300 oO 9 990 15,85 25 ~6hD 58.42 OQ 1.530 oo 60 rO \ 38.86 = | 7 i Le _- 200 8 _ 0.100 5.126 | 2. 130.20 10.400 = 1 264.16 10.600 7 269.24 / i POWER ADJUST THIRD ANGLE PROJECTION TOLERANCES: 6 PIN JONES XX + 0.03 CONNECTOR MALE 0.76 XXX+ 0.10 0.25 INCH MM 12-22TWT Retrofit: High Power Common Carrier ener eee ee ee es Case Drawing PHL 10.600 * 269.24 a A : rs. i 3.730 2.400 94.74 Ke) | 60.96 | () : tod, l. 2.425 || 6-PIN 61.595 JONES PLUG 2.850 7239 "| >_ @ 8 e | ose mur 2.650 [A 67.31 v | g j 1,500 38.10 TYP 225 3.000 5.72 ~~ 76.20 .450 8.675 a, 11.43 220.35 YP 10.675 . 271.15 YP 11.600 294.64 12-23 NOTES (UNLESS OTHERWISE SPECIFIED): 1. DIMENSIONS ARE SPECIFIED IN INCHES + 0.02 2. TOLERANCES: .XX ~45 + 0.010 + .25TWT Retrofit: High Power Common Carrier Case Drawing RJA 10.50 8.00 266.7 4-PIN 8-32 UNC-2B X .200 DEEP (MIN) JONES PLUG (16 PLCS) 13.45 341.63 10.95 * 276.13 RF RE INPUT A 5 o |_- OUTPUT CONN SMA-F CONN SMA-F oj | oF o / / 3.75 FUSE POWER 1.85 95.25 ADJUST . 1,85 [* 46.99 145 [* 46.99 | 425 1.15 a . - sar 29.21 [~~ 425 10.795 4} | 29.21 1 {70.735 1's C4 40.64 f = 2.25 t 70 2.25 57.15 8 17.78 37.15 .35 735.89 qq 2.25 aS 205 57.15 EI 57.15 _4 , NOTES (UNLESS OTHERWISE SPECIFIED): 1. DIMENSIONS ARE SPECIFIED IN !NCHES + 0.02 M 2. TOLERANCES: .XX ~35 + 0.010 XXX 12-24 + .25TWT Retrofit: High Power Common Carrier 10 WATT SOLID STATE POWER AMP UNIT OUTPUT COAX ~ ~ ~ ~ ~ ~ ~ J Se EXISTING A #6-32 NUT WAVEGUIDE (4 PLCS) #10-32 X 1/2" 100 FLAT HEAD PHIL. #6 LOCK (6 PLCS) ~ ~~ WASHER #6-32 X 5/8" > 4 PLCS) ; ~o! (4 PLCS) ~~ ~ ea, Oo ; w ~ ~ q #9-32 X 1/2" Ry (5 PLCS) RN ~ LOCK WASHER (5 PLCS) ~~ INPUT COAX 12-25